CN102537177B - Buffer - Google Patents

Abstract

A kind of buffer, in the case of changing damping force characteristic, it is also possible to according to each characteristic, at random changes the damping force variable amplitude of frequency induction mechanism.The frequency induction mechanism (25) of the lower end side being arranged at piston rod (3) includes: with piston rod (3) integratedly at the tubular shell (26) of inner core (1) intrinsic displacement, free-piston (29), O RunddichtringO (30,31).The gate (33) of area of passage changeable mechanism (32) is provided with: the endoporus (33A) that axially extends, damping hole (33B), oil groove (33C, 33D, 33E, 33F).According to the turned position of gate (33), change the aperture area between oilhole (3C) and damping hole (33B).Aperture area between oilhole (3D, 3E) and oil groove (33C, 33D) and between oilhole (3F, 3G) and oil groove (33C, 33D, 33E, 33F) regulates changeably also according to the turned position of gate (33).

Description

Buffer

Technical field

The present invention relates to the buffer being suitable for buffering the vibration of such as automobile etc..

Background technology

Generally, two take turns or the vehicle such as four-wheel automobile is configured to, and arrange hydraulic pressure between wheel side and body side The vibration etc. of the above-below direction that buffer produces when buffering traveling.This hydraulic bjuffer is activated by use The damping hole area that device makes working fluid be passed through changes, it is possible to declined from low by produced damping force Subtract power and be suitably adjusted to highly attenuating power.Further, (damping force is according to defeated to be also attached with frequency induction mechanism Enter the mechanism that frequency of vibration reduces), raising (such as, the ginseng of ride quality is realized by the combination of both sides According to patent documentation 1).

Such as, as shown in Fig. 2 of patent documentation 1, even if being hardware features by damping force property settings In the case of, this frequency induction mechanism also is able to relative to high frequency input, damping force is set as low damping force.

Patent documentation 1:(Japan) Unexamined Patent 6-94065 publication

But, in the buffer of above-mentioned prior art, determine the damping force amplitude-variable of frequency induction mechanism The damping hole area of degree is constant.Therefore, in the decay that will be produced by damping force adjustment type hydraulic bjuffer When power is changed to hardware features, medium characteristic or software feature, it is impossible to freely change sensation of frequency according to each characteristic Answer the damping force variable amplitude of mechanism.

Such as, when being set as hardware features for inclination when suppressing motor turning, if Reduce and strengthen damping force variable amplitude from the dither on road surface, and in order to improve on good road Ride quality when travelling on face and be set as software feature, then can not obtain to suppress spring low-resonance The vibration of frequency and reduce the characteristic of damping force variable amplitude.

Summary of the invention

The present invention proposes in view of above-mentioned prior art problem, its object is to, it is provided that a kind of in change It also is able at random change the decay of frequency induction mechanism according to each characteristic in the case of more damping force characteristic The buffer of power variable amplitude.

In order to solve above-mentioned problem, the composition that the invention of first aspect uses is to possess: cylinder parts, Envelope has working fluid；Piston, it is possible to be flush-mounted in movably in these cylinder parts, splits this cylinder components interior Become two rooms；Piston rod, end side is fixed on this piston, dashes forward in the outside of the lateral described cylinder parts of the other end Go out；Primary path, by the movement of described piston, make the working fluid two rooms in described cylinder parts it Between flow；First path and alternate path, be set up in parallel with this primary path, by described piston Mobile, make to flow to another room from arbitrary room in the working fluid two rooms in described cylinder parts；Master declines Subtract valve, be arranged at described primary path, the described working fluid that the movement by described piston is produced Flowing carries out limiting to produce damping force；Damping force produces mechanism, is arranged at described first path, passes through The movement of described piston and the flowing of described working fluid that produces carry out limiting to produce damping force；Freely Piston, is arranged in described alternate path, this alternate path is divided into upstream side and downstream；Institute State the midway of the first path and alternate path, be provided with can regulate the area of passage of the respective area of passage can Become mechanism.

According to the present invention, by area of passage changeable mechanism, it is possible to regulation the first path independently Area and the area of alternate path.Therefore, the damping force produced by buffer is changed to hardware features, During arbitrary characteristic in medium characteristic and software feature, it is also possible to freely change by freely living according to each characteristic The damping force variable amplitude of the frequency induction mechanism that plug is constituted.

Accompanying drawing explanation

Fig. 1 is the profilograph of the hydraulic bjuffer representing first embodiment of the invention；

Fig. 2 is main valve and the profilograph of disc valve that constituting in enlarged representation Fig. 1 shortens side control valve；

Fig. 3 is the upward view seen as monomer from downside by the main valve in Fig. 2；

Fig. 4 is the upward view seen as monomer from downside by the disc valve in Fig. 2；

Fig. 5 is the part sectioned view of the piston rod in enlarged representation Fig. 1 and gate；

Fig. 6 is VI-VI from Fig. 5 to the drawing in side sectional elevation of gate in terms of apparent direction；

Fig. 7 is VII-VII from Fig. 5 to the drawing in side sectional elevation of gate in terms of apparent direction；

Fig. 8 is the performance plot of relation between position of strobe and the aperture area representing the first embodiment；

Fig. 9 is the characteristic line chart of relation between frequency and the damping force representing the first embodiment；

Figure 10 is the profilograph of the hydraulic bjuffer representing the second embodiment；

Figure 11 is the profilograph of the hydraulic bjuffer representing the 3rd embodiment；

Figure 12 is the profilograph of the hydraulic bjuffer entirety representing first and second embodiment；

Description of reference numerals

1 inner core

2,71 piston

2A, 2B, 71A, 71B oil circuit (primary path)

3,72,81 piston rod

3C, 72C, 85C oilhole (alternate path)

3D～3G, 72D, 72E, 85D～85G oilhole (the first path)

4 shorten side damping mechanism (shorten side damping force and produce mechanism)

Side body on 5

6,15 main valve

7,16 masters (main decay valve)

7B, 16B arc-shaped hole (the first path)

8,17 elastic sealing element

9, check valve outside 18

10, check valve inside 19

11,20 disc valve

11B, 20B incision hole (the first path)

13 elongate sides damping mechanisms (elongate sides damping force produces mechanism)

14 times side bodies

22,23,24,75,76,77 orifice members

25 frequency induction mechanisms

26 housings

27 acorn nuts

28 have bottom tube-like body

28D tilts arc surface (housing contact surface, the face of inclination)

29 free-pistons

29B, 29C tilt arc surface (free-piston contact surface, the face of inclination)

30,31O RunddichtringO (elastomer, resistance component)

32,86 area of passage changeable mechanism

33,78 gates (variable open area parts)

33A, 78A, 88A endoporus (alternate path)

33B, 78B, 88B damping hole (opening, alternate path)

33C, 33D, 88C oil groove (shortens side the first path)

33E, 33F, 88D oil groove (elongate sides the first path)

73,74 disc valves (main decay valve)

78C, 78D, 78E oil groove (the first path, damping force produce mechanism)

84 barrel-type casings

85 stepped stem

87 electromagnetic proportional valves are with solenoid (actuator)

88 guiding valves (variable open area parts)

90 back-moving springs

A bar side grease chamber

B bottom side grease chamber

C, D pressure chamber

The upper side room of E

Side room under F

Detailed description of the invention

Embodiments described below is not limited to the content described in above-mentioned " summary of the invention " part, its He also solves various problem, and achieves effect.Below, the problem that embodiment is to be solved is enumerated Corresponding main contents, the most also comprise the content described in above-mentioned " summary of the invention " part.

(characteristic improvement) is according to vibrational state change damping force characteristic (damping force to piston speed) Time, it is desirable to set the characteristic of further smoothly change etc..This is because, when suddenly, switching produces little damping force Characteristic and when producing the characteristic of big damping force, the actual damping force produced switches the most abruptly, therefore car Ride quality decline, and, if there is damping force switching, then vehicle in the turning to of vehicle Action unstable, it is possible to cause driver to turning to generation sense of discomfort.Therefore, such as described patent literary composition Offer shown in 1, the property settings further smoothly changed is inquired into, it is desirable to achieve further characteristic Improve.

The region that (suppression of maximization) frequency induction mechanism moves up and down owing to needing free-piston, because of , if increasing this region, the problem making axial length elongated etc will be there is in this.If hydraulic cylinder device Become large-sized, then hydraulic cylinder device installation degree of freedom on vehicle body will reduce, therefore hydraulic cylinder dress The axial length increase put just has become important topic.If incidentally regulating the mechanism of damping force from outside, then Correspondingly increase size, be therefore strongly required to realize the miniaturization of frequency induction part.

(reduction of number of components), in addition to piston, frequency induction mechanism is also equipped with housing, free-piston etc. Constituent part, therefore number of components increases.If number of components increase, influence whether productivity ratio, durability, Reliabilities etc., therefore, not only expect to obtain desired characteristic i.e. corresponding with wide frequency of vibration region Damping force characteristic, and expect that realizing number of components reduces.

Below, the buffer of embodiment of the present invention to be applied to the situation of for motor vehicle hydraulic bjuffer As a example by, it is described in detail with reference to the accompanying drawings.

Here, Fig. 1～Fig. 9 and Figure 12 represents first embodiment of the present invention.Figure 12 represents that first is real Execute the structure that the buffer of mode is overall, be provided with urceolus 100 in the periphery of inner core 1, at inner core 1 and urceolus The accumulator R enclosing oil and gas it is provided with between 100.Accumulator R and bottom side grease chamber B passes through bottom valve 101 Connect.Bottom valve mechanism is provided with the check making fluid flow to bottom side grease chamber B the most without resistance from accumulator R Valve 102 and the decay valve 103 of generation greater attenuation power.

The piston rod 3 being connected with piston 2 described later by through to guide rod 104 and sealing member 105 and from urceolus 100 highlight.It addition, stick 34 described later highlights from the jag of piston rod 3.Before piston rod 3 End is installed on automobile by installing rack (not shown).When being installed on automobile, Direct Action Type activates Device 106 is installed from engine room and the luggage case side of automobile.107 is the ring for being arranged on wheel side.

As it is shown in figure 1, envelope has the fluid as working fluid, described urceolus 100 He in inner core 1 Ring-type accumulator R it is formed with between described inner core 1.

2 is to insert the piston being embedded in inner core 1 slidably, and this piston 2 will be divided into bar side oil in inner core 1 Room A and bottom side grease chamber B the two grease chamber.It is formed with multiple general the most with interval Oil circuit 2A, 2B that bar side grease chamber A connects with bottom side grease chamber B, these oil circuits 2A, 2B by relative to The oilhole that the axis of piston 2 tilts is constituted.Oil circuit 2A, 2B are constituted makes fluid at bar side grease chamber A and the end The primary path of circulation between side grease chamber B.

At the downside end face of the side becoming piston 2, it is provided with: to surround the side of a side opening of oil circuit 2A Annular recessed portion 2C that formula is formed, and be positioned at the radial outside of this annular recessed portion 2C and make master 16 described later The ring-type valve seat 2D taking a seat or disseating.At the upside end face of the opposite side becoming piston 2, it is provided with: with bag Annular recessed portion 2E that the mode of the opposite side opening enclosing oil circuit 2B is formed, and it is positioned at this annular recessed portion 2E Radial outside and make the ring-type valve seat 2F that master 7 described later takes a seat or disseat.

3 is the piston rod axially extended in inner core 1, and this piston rod 3 is configured as end side Lower end side is inserted in inner core 1, is fixedly installed in piston 2 by the acorn nut 27 etc. of housing 26 described later. It addition, the upper end side as another side of piston rod 3 via described guide rod etc. to described urceolus and described The outside of inner core 1 highlights.In the inner circumferential side of piston rod 3, the most through and be provided with: towards its lower end side Opening is formed and makes gate 33 described later insert embedding gate load hole 3A rotationally, and fills from this gate The bar of the upwardly extending path of upper end side of hand-hole 3A inserts hole 3B.

It addition, be provided with the multiple oilholes extended outward to footpath from gate load hole 3A on piston rod 3 3C, 3D, 3E, 3F, 3G, these oilholes 3C, 3D, 3E, 3F, 3G respectively in axial direction and circumference Separately.In these oilholes 3C～3G, each oilhole 3C～3E is arranged in the inner core 1 separated by piston 2 The position of interior bar side grease chamber A, the bottom side grease chamber B that remaining each oilhole 3F, 3G are arranged in inner core 1 Position.

Wherein, each oilhole 3C of top side it is positioned at by damping hole 33B radially and gate 33 described later Endoporus 33A connection or disconnect.It addition, each oilhole 3D, 3E by the oil groove 33C of gate 33 described later, 33D is interconnected or disconnects.Each oilhole 3F, 3G oil groove 33E, 33F by gate 33 described later It is interconnected or disconnects.Orifice members 22 described later is made to exist additionally, be formed at the outer circumferential side of piston rod 3 Ring-type stage portion 3H of upper location.

4 is that the shortening side damping force that present embodiment uses produces mechanism's (hereinafter referred to as shortening side damping mechanism 4), as it is shown in figure 1, this shortening side damping mechanism 4 is positioned at the bar side grease chamber A of inner core 1, and with solid Determine state and be installed on the upside of piston 2.In the shortening stroke of piston rod 3, when piston 2 is at inner core 1 During introversive lower sliding, shorten side damping mechanism 4 to from bottom side grease chamber B via piston 2 each oil circuit 2B, Pressure chamber C described later, the oilhole 3E of piston rod 3,3D, oil groove 33C, 33D of gate described later 33 Produce resistance Deng the fluid circulated to bar side grease chamber A, thus produce the damping force of regulation.

Shorten side damping mechanism 4 to include: have the upper side body 5 of cup shape, main valve 6, outside described later list To valve 9, inner side check valve 10 and disc valve 11, described in have the upper side body 5 of cup shape to be positioned at described later Between orifice members 23 and piston 2, it is fixed on the outer circumferential side of piston rod 3.Described main valve 6 has and is somebody's turn to do The following side of upper side body 5 with the elastic sealing element described later 8 that is fitted together to of magnitude of interference ground, and its with on Ring-type pressure chamber C it is formed with between side body 5.

On the upper side body 5 shortening side damping mechanism 4, it is provided with: be formed at the upper of side body 5 on this Side end face and make outside check valve 9 take a seat or disseat ring-type valve seat 5A, be positioned at than this ring-type valve seat 5A Make near the position of radially inner side that the inside line of pressure chamber C and ring-type valve seat 5A connects as axle To the oilhole 5B of oil circuit, make the conduct radially oil that pressure chamber C and the oilhole 3E of piston rod 3 always connects The oil groove 5C on road.Outside check valve 9 is the valve constituting relief valve, when the pressure in pressure chamber C rises to Valve opening during predetermined security settings pressure, in addition, is seated at ring-type valve seat 5A, keeps closed valve state.

Main valve 6 includes taking a seat or disseat in the master 7 of ring-type valve seat 2F of piston 2, and by add sulfur, The methods such as sintering are fixedly installed on the annular resilient seal parts 8 of the above outer circumferential side of this master 7.This elasticity Seal member 8 rubber elastomeric material is formed as the ring-type of heavy wall, relative to the bar side grease chamber A in outside Seal the pressure chamber C of inner side in liquid-tight manner.

It addition, the master 7 of main valve 6 is configured to double as the constitutive requirements the most main decay valve of the present invention.Living In the shortening stroke of stopper rod 3, when the pressure differential when between grease chamber A, B increases to predetermined setting value, main The shortening side damping force of regulation is there is in valve 6 by making master 7 leave ring-type valve seat 2F.When main valve 6 is (main Dish 7) valve opening time, between grease chamber A, B via piston 2 oil circuit 2B connect, be consequently formed the present invention Constitutive requirements i.e. primary path.

As shown in Figures 2 and 3, the master 7 of main valve 6 is provided with circular port 7A and multiple arc-shaped hole 7B, Multiple arc-shaped hole 7B are positioned at the radial outside of this circular port 7A, and circumferentially spaced and formed.Main Dish 7 is installed on the outer circumferential side of piston rod 3 by circular port 7A.Arc-shaped hole 7B passes through disk described later Incision hole 11B of valve 11 makes annular recessed portion 2E of piston 2 always connect with described pressure chamber C.

Inner side check valve in 10 annular recessed portion 2E being provided in piston 2, inside this, check valve 10 falls Seat or disseat in the bottom surface side of annular recessed portion 2E, connect or disconnect oil circuit 2B and the annular recessed portion of piston 2 Between in 2E.And, inner side check valve 10 allows the oil circuit from piston 2 of the fluid in bottom side grease chamber B 2B lateral annular recessed portion 2E effluent leads to, otherwise, stop and lead to from annular recessed portion 2E lateral oil circuit 2B effluent.

11 is the disc valve of the upside of check valve 10 inside packing ring etc. is arranged at, such as Fig. 2 and Fig. 4 Shown in, this disc valve 11 is provided with circular port 11A and multiple incision hole 11B, multiple incision hole 11B are positioned at The radial outside of this circular port 11A, and circumferentially spaced and formed.Disc valve 11 passes through circular port 11A is installed on the outer circumferential side of piston rod 3.Each incision hole 11B is shaped generally as T-shaped as oilhole, By each arc-shaped hole 7B of master 7, always make annular recessed portion 2E of piston 2 and described pressure chamber C Connection.In this case, incision hole 11B is compared with the arc-shaped hole 7B of master 7, and the area of passage is filled Divide little, the fluid of circulation is produced damping (relatively り) effect and produces damping force.

12 is that disc valve 11 is clipped in the supporting disk between itself and master 7, and this supporting disk 12 is by circle Hole 12A is installed on the outer circumferential side of piston rod 3.Supporting disk 12 strengthens disc valve with its upper side from downside 11 and master 7.It addition, supporting disk 12 is configured in annular recessed portion 2E of piston 2, also serve as limiting The guard ring function of the maximum opening of inner side check valve 10.

13 is that the elongate sides damping force that present embodiment uses produces mechanism's (hereinafter referred to as elongate sides decay machine Structure 13), as it is shown in figure 1, this elongate sides damping mechanism 13 is positioned at the bottom side grease chamber B of inner core 1, with Stationary state is installed on the downside of piston 2.In the extended travel of piston rod 3, when piston 2 is at inner core 1 The most upwards during sliding, elongate sides damping mechanism 13 to from bar side grease chamber A via piston 2 each oil circuit 2A, The pressure chamber D of lower side body 14, the oilhole 3F of piston rod 3,3G, the oil groove 33E of gate described later 33, The fluid that 33F etc. circulate to bottom side grease chamber B produces resistance, thus produces the damping force of regulation.

Elongate sides damping mechanism 13 includes the lower side body 14 of bottom tube-like, main valve 15, outside described later Check valve 18, inner side check valve 19 and disc valve 20, described in have the lower side body 14 of bottom tube-like to be positioned at after Between orifice members 24 and the piston 2 stated, it is fixed on the outer circumferential side of piston rod 3.Described main valve 15 has Have with the upper face side of this lower side body 14 with the chimeric elastic sealing element described later 17 in magnitude of interference ground, Ring-type pressure chamber D is formed between itself and lower side body 14.

The lower side body 14 of elongate sides damping mechanism 13 and the upper side body 5 shortening side damping mechanism 4 Constitute roughly the same, there is ring-type valve seat 14A, as the oilhole 14B of axial oil circuit, as radially oil The oil groove 14C on road.Outside check valve 18 is the valve constituting relief valve, when the pressure in pressure chamber D rises To valve opening during predetermined security settings pressure, in addition, it is seated at ring-type valve seat 14A, keeps valve closing State.

Main valve 15 is identical with the composition of the main valve 6 shortening side damping mechanism 4, including: take a seat or disseat in The master 16 of the ring-type valve seat 2D of piston 2, and it is fixedly installed on the ring of outer circumferential side below this master 16 The elastic sealing element 17 of shape.Main valve 15 is also configured to double as the constitutive requirements the most main decay valve of the present invention.

In the extended travel of piston rod 3, the pressure differential when between grease chamber A, B increases to predetermined setting During value, main valve 15 produces the elongate sides damping force of regulation by making master 16 leave ring-type valve seat 2D. When main valve 15 (master 16) valve opening, connected by the oil circuit 2A of piston 2 between grease chamber A, B, It is consequently formed the constitutive requirements i.e. primary path of the present invention.As shown in Figures 2 and 3, the master 16 of main valve 15 It also is provided with circular port 16A and multiple arc-shaped hole 16B.

Inner side check valve in 19 annular recessed portion 2C being disposed on piston 2, inside this, check valve 19 falls Seat or disseat in the bottom surface side of annular recessed portion 2C, connect or disconnect oil circuit 2A and the annular recessed portion of piston 2 In 2C.Inner side check valve 19 allows the fluid in bar side grease chamber A from the lateral ring of oil circuit 2A of piston 2 Shape recess 2C effluent leads to, otherwise, stop and lead to from annular recessed portion 2C lateral oil circuit 2A effluent.

20 is the disc valve of downside being arranged at inner side check valve 19 by packing ring etc., this disc valve 20 with The composition of the disc valve 11 shortening side damping mechanism 4 is identical, as shown in Figure 2 and Figure 4, has circular port 20A and multiple incision hole 20B.Each incision hole 20B of disc valve 20 each arc-shaped by master 16 Hole 16A makes annular recessed portion 2C of piston 2 always connect with described pressure chamber D.In this case, Incision hole 20B is compared with the arc-shaped hole 16A of master 16, and the area of passage is the least, the oil to circulation Liquid produces damping.

21 is that disc valve 20 is clipped in the supporting disk between itself and master 16, and this supporting disk 21 is by circle Hole 21A is installed on the outer circumferential side of piston rod 3.Supporting disk 21 strengthens disc valve with its downside from upside 20 and master 16.It addition, supporting disk 21 is configured in annular recessed portion 2C of piston 2, also serve as limiting The guard ring function of the maximum opening of inner side check valve 19.

22,23 it is disposed on the orifice members between stage portion 3H of piston rod 3 and upper side body 5, This orifice members 22,23 is made up of the ring-type circle etc. of the chimeric outer circumferential side being arranged at piston rod 3.Aperture Parts 22 make fluid inflow and outflow between the oilhole 3C of bar side grease chamber A and piston rod 3.It addition, hole Mouthpiece 23 makes fluid inflow and outflow between the oilhole 3D of bar side grease chamber A and piston rod 3.

24 are disposed on another between the lower side body 14 of elongate sides damping mechanism 13 and acorn nut 27 Orifice members, this orifice members 24 is also by structures such as the ring-type circles of the chimeric outer circumferential side being arranged at piston rod 3 Become.Orifice members 24 makes fluid inflow and outflow between the oilhole 3G of bottom side grease chamber B and piston rod 3.

The frequency induction mechanism of 25 lower end side being disposed on piston rod 3, as it is shown in figure 1, this sensation of frequency Answer mechanism 25 to include: with piston rod 3 integratedly inner core 1 intrinsic displacement tubular shell 26, can phase para-position It is arranged at the free-piston described later 29 in this housing 26, O RunddichtringO 30,31 with moving.Housing 26 Including being threadably engaged the acorn nut 27 as cover of the lower end side being arranged at piston rod 3 and having Bottom tube-like body 28.

Acorn nut 27 includes: the inner screw nut portion 27A that is threadedly engaged with the lower end side periphery of piston rod 3, The ring-type cap 27B that extends outward from the upper lateral footpath of this inner screw nut portion 27A, from this annular cover The outside tubular of the spigot surface that the outer circumferential side of portion 27B is the most sagging and inner peripheral surface becomes free-piston 29 is sagging Portion 27C.The lower surface of tubular dip portion 27C constitutes the housing contact of O RunddichtringO 30 described later contact Face.

Bottom tube-like body 28 is had to include: upper end side is fixed on acorn nut 27 by methods such as rivetings from outside Ring-type cap 27B and cylindrical portion 28A that downwardly extends in inner core 1, and close this cylindrical portion 28A The annular base plate portion 28B of lower end side.Central side in base plate 28B is formed lower side room described later The intercommunicating pore 28C that F connects with bottom side grease chamber B.

Connecing as housing of O RunddichtringO 31 described later contact it is formed with in the inner circumferential side of cylindrical portion 28A The inclination arc surface 28D of contacting surface, this inclination arc surface 28D are the shiftings relative to free-piston 29 described later The face that dynamic direction (that is, axial) tilts, and constitute the face with curved surface.Here, inclination arc surface 28D has following function: when free-piston 29 is to bottom offset, make O RunddichtringO 31 its with after Flexibly compression between annular convex 29A stated, suppresses free-piston 29 by resistance now Displacement towards end of travel.

29 is the free-piston being slidably disposed in housing 26, as it is shown in figure 1, this free-piston 29 are formed as the piston having bottom tube-like, are provided with at its outer circumferential side and dash forward outward to footpath from axial centre position Annular convex 29A gone out.The lower end side becoming axial side of free-piston 29 is displaceably inserted and is embedded in In having cylindrical portion 28A of bottom tube-like body 28, and the upper end side becoming axial opposite side is displaceably inserted embedding In tubular dip portion 27C of acorn nut 27.

The free-piston 29 of axially opposed displacement in housing 26 is by the annular cover with acorn nut 27 Portion 27B and have base plate 28B of bottom tube-like body 28 to abut, it is stipulated that the end of travel of above-below direction.From (that is, alternate path) in housing 26 is divided into upstream side and the two room, downstream i.e. by piston 29 Upper side room E and lower side room F.Here, alternate path is separated by free-piston 29, fluid will not be produced and exist The liquid stream replaced is carried out between bar side grease chamber A and bottom side grease chamber B, but, relative at free-piston 29 In the period that housing 26 moves, the fluid of bar side grease chamber A flows into upper side room E, and commensurability fluid is from downside Room F is extruded to B side, room, bottom side, the most substantially creates liquid stream.

Its upper face side of annular convex 29A and the following side that are arranged at the periphery of free-piston 29 are formed as tilting Arc surface 29B, 29C, these tilt arc surface 29B, 29C become O RunddichtringO 30 described later, The free-piston contact surface of 31 contacts.Tilt arc surface 29B, 29C composition to have relative to free-piston The face of the axially inclined curved surface of 29.Here, under the inclination arc surface 29B of free-piston 29 and tubular The lower surface of lappet 27C across O RunddichtringO 30 relatively, tilts arc surface 29C and has in the axial direction The inclination arc surface 28D of bottom tube-like body 28 is relative across O RunddichtringO 31 in the axial direction.

30,31 is the O RunddichtringO as elastomer of resistance component constituting frequency induction mechanism 25, This O RunddichtringO 30,31 is configured at cylindrical portion 28A and the outer peripheral face of free-piston 29 of housing 26 Between, seal in liquid-tight manner between the two.Upper side room E and lower side room F in housing 26 are close by O type Seal 30,31 remains the state sealed against each other.

When free-piston 29 shifts up in housing 26, O RunddichtringO 30 is in tubular dip portion 27C Lower surface and annular convex 29A (tilt arc surface 29B) of free-piston 29 between flexibly compress Deformation.Now, O RunddichtringO 30 shifts up generation resistance to free-piston 29 towards end of travel Power.It addition, when free-piston 29 in housing 26 to bottom offset time, O RunddichtringO 31 is in cylindrical portion The inclination arc surface 28D of 28A side and annular convex 29A (tilting arc surface 29C) of free-piston 29 Between flexibly compression.Now, O RunddichtringO 31 to free-piston 29 towards end of travel Resistance is produced to bottom offset.

32 is the area of passage changeable mechanism that present embodiment uses, and this area of passage changeable mechanism 32 includes The actuators (not shown) such as gate 33 described later, stick 34 and motor.The variable machine of the area of passage The actuator of structure 32 is arranged at the prominent side of such as piston rod 3, is entered gate 33 by stick 34 Row rotating operation.

33 are disposed on the gate in the gate load hole 3A of piston rod 3, and this gate 33 constitutes path face The variable open area parts of long-pending changeable mechanism 32.Gate 33 is arranged at manipulation in the way of rotating integrally The lower end side of bar 34, rotates in the gate load hole 3A of piston rod 3 together with stick 34.Handle Bar 34 is inserted in the bar insertion hole 3B being arranged at piston rod 3, and its upper end side states the defeated of actuator with described Shaft (not shown) connects.

The inner circumferential side of gate 33 is the endoporus 33A axially extended, upper with in housing 26 of its lower end side Side room E always connects.Open it addition, gate 33 is provided with the conduct worn outward from endoporus 33A to footpath Mouthful damping hole 33B, at axle this damping hole upward out 33B of gate 33 and be formed at gate 33 The oil groove 33C of outer peripheral face, 33D, axially out this oil groove 33C, 33D and be formed at gate 33 Other oil grooves 33E, 33F of outer peripheral face.

As it is shown in figure 5, damping hole 33B be configured at axially and radially go up all with the oilhole 3C of piston rod 3 Relative position, according to the turned position of gate 33, connects or disconnects oilhole 3C and endoporus 33A.? This, the constitutive requirements of the present invention i.e. alternate path is by the orifice members 22 connected with bar side grease chamber A, piston The oilhole 3C of bar 3, the damping hole 33B of gate 33, endoporus 33A and housing 26 are constituted.This second lead to Road is the path arranged side by side relative to described primary path.And, constitute the housing 26 of a part for alternate path Interior it is divided into upper side room E and lower side room F by free-piston 29.

Oil groove 33C, 33D of gate 33 according to the turned position of gate 33 by the oilhole 3D of piston rod 3, Connect between 3E or disconnect.Here, as it is shown in figure 5, axial in size α along gate 33 of oil groove 33C In the range of extend, oil groove 33D is formed in the range of the size beta (β ＜ α) shorter than size α.As Shown in Fig. 6, oil groove 33C is formed from the arc-shaped groove of the outer peripheral face of gate 33 and constitutes, and its groove width is at lock Door 33 circumference on roughly equal.On the other hand, as it is shown in fig. 7, oil groove 33D be arc-shaped cut The outer peripheral face of gate 33 and formed, its groove width is gradually reduced in the circumference of gate 33.

Here, decline in the oilhole 3D of oil groove 33C, 33D of gate 33 and piston rod 3,3E, shortening side Subtract the pressure chamber C of mechanism 4, the arc-shaped hole 7B of master 7, the incision hole 11B (reference of disc valve 11 Fig. 2～Fig. 4) and the oil circuit 2B etc. of piston 2 together constitute with the constitutive requirements of the present invention and i.e. shorten side first Path, this first path is the path arranged side by side relative to described primary path.

Oil groove 33E, 33F of gate 33 is according to the turned position of gate 33, by the oilhole of piston rod 3 Connect between 3F, 3G or disconnect.Here, oil groove 33E is substantially same with described oil groove 33D, edge The axial of gate 33 is formed, as it is shown in fig. 7, its groove width is in the week of gate 33 in the range of size beta Upwards it is gradually reduced.It addition, oil groove 33F is substantially same with described oil groove 33C, along the axle of gate 33 Being formed in the range of size α, as shown in Figure 6, its groove width is roughly equal in the circumference of gate 33.

It addition, oil groove 33E, 33F of gate 33 and the oilhole 3F of piston rod 3,3G, elongate sides decay The pressure chamber D of mechanism 13, the arc-shaped hole 16B of master 16, the incision hole 20B (ginseng of disc valve 20 According to Fig. 2～Fig. 4) and the oil circuit 2A etc. of piston 2 together constitute with the constitutive requirements i.e. elongate sides of the present invention One path, this first path is the path arranged side by side relative to described primary path.

Being provided with cylinder 35 in the gate load hole 3A of piston rod 3, cylinder 35 is positioned at gate 33 times Side (axial side), is provided with the guiding parts of tubular in the upside (axial opposite side) of gate 33 36 and seal member 37.Seal member 37 be stop fluid from gate load hole 3A and stick 34 it Between leak into outside parts.Described cylinder 35 composition prevents gate 33 to be shed to from gate load hole 3A The slip-off preventing parts of lower section.The inner circumferential side of cylinder 35 is endoporus 35A, and this endoporus 35A also constitutes described A part for two paths.

The hydraulic bjuffer of the first embodiment has structure as above, then, carries out its work Explanation.

First, when hydraulic bjuffer is installed on vehicle, the upper end side of piston rod 3 is installed on vehicle Body side, the bottom side of described urceolus is installed on wheel side.When the vehicle is running, uneven because of road surface Deng and produce the vibration of above-below direction, now piston rod 3 elongates or shortens from inner core 1 and is subjected to displacement, It is shortened by side damping mechanism 4 and elongate sides damping mechanism 13 etc. and can produce damping force such that it is able to be slow Rush the vibration of vehicle.

That is, in the shortening stroke of piston rod 3, piston rod 3 enters in inner core 1, in bottom side grease chamber B Pressure ratio bar side grease chamber A high, therefore the fluid in bottom side grease chamber B from the oil circuit 2B of piston 2 via Inner side check valve 10 flows in annular recessed portion 2E, oily incision hole 11B via disc valve 11 of this inflow, Arc-shaped hole 7B (with reference to Fig. 2～Fig. 4) of master 7 flows to shorten the pressure chamber C of side damping mechanism 4 In.

Then, the fluid in pressure chamber C from the oil groove 5C of upper side body 5 via the oilhole of piston rod 3 3E, the oil groove 33D of gate 33,33C, the oilhole 3D of piston rod 3 and orifice members 23 flow to bar side In grease chamber A, such as, by incision hole 11B of disc valve 11, oil groove 33D, 33C of gate 33 Deng, it is possible to produce the damping force shortening side.

In this condition, the shortening speed of piston rod 3 is accelerated, and the pressure differential when between grease chamber A, B exceedes During described setting value, the master 7 of the main valve 6 constituting main decay valve leaves ring-type valve seat 2F and valve opening, energy Enough shortening side damping forces producing regulation.It should be noted that the outside shortening side damping mechanism 4 is unidirectional Valve 9 plays following function as relief valve: the pressure in pressure chamber C is opened when rising to security settings pressure Valve, the pressure in suppression pressure chamber C rises.

On the other hand, in the extended travel of piston rod 3, due to the pressure ratio bottom side in bar side grease chamber A Grease chamber B is high, and therefore the fluid in bar side grease chamber A flows into via check valve 19 from the oil circuit 2A of piston 2 In annular recessed portion 2C, oily incision hole 20B via disc valve 20 of this inflow, the arc-shaped hole of master 16 16B flows in the pressure chamber D of elongate sides damping mechanism 13.

Then, the fluid in pressure chamber D from the oil groove 14C of lower side body 14 via the oil of piston rod 3 Hole 3F, the oil groove 33E of gate 33,33F, the oilhole 3G of piston rod 3 and orifice members 24 flow to the end In side grease chamber B, such as, by incision hole 20B of disc valve 20, oil groove 33E, 33F of gate 33 Deng, it is possible to produce the damping force of elongate sides.

In this state, the elongation speed of piston rod 3 is accelerated, and the pressure differential when between grease chamber A, B surpasses When crossing described setting value, the master 16 of the main valve 15 constituting main decay valve leaves ring-type valve seat 2D and valve opening, The elongate sides damping force of regulation can be produced.It addition, the outside check valve 18 of elongate sides damping mechanism 13 As the relief valve following function of performance: the pressure in pressure chamber D rises to valve opening during security settings pressure, Pressure in suppression pressure chamber D rises.

Then, illustrate by by the gate 33 of area of passage changeable mechanism 32 change respectively the first path and The area of passage of alternate path and regulate the situation of damping force changeably.

In the first embodiment, as shown in the oblique line portion 38 in Fig. 8, gate 33 is being configured at position When putting a, oil groove 33C, 33D of gate 33 be in oilhole 3D, the 3E with piston rod 3 just to shape State, aperture area (that is, the area of passage of the first path of damping force regulation side) between the two becomes Big aperture area.It addition, when gate 33 is turned to position b from position a, its aperture area is also Remain maximum area.But, when gate 33 is turned to position c, d from position b, such as, Described aperture area is gradually reduced because of oil groove 33D, and when position d, aperture area becomes zero, oilhole 3D, Closed by the outer peripheral face of gate 33 between 3E and disconnect.It addition, gate 33 is being turned to from position d During the e of position, its aperture area also remains zero.

On the other hand, as shown in the oblique line portion 39 in Fig. 8, the oilhole 3C and damping hole 33B of piston rod 3 Between aperture area (that is, the area of passage of alternate path of side answered by sensation of frequency) gate 33 is being set to During a of position, its aperture area is zero.But, when gate 33 is turned to position b from position a, Damping hole 33B and oilhole 3C just to and become maximum aperture area.It addition, by gate 33 from position Putting b when turning to position d, its aperture area remains the area of maximum.It addition, turning to position e Time, aperture area becomes zero.

So, composition as described below is used in the first embodiment: when the opening of damping force regulation side When area is constant (maximum aperture area) between a～b of position, controls into and make sensation of frequency answer opening of side Open area start from scratch (until become maximum aperture area) increase, when the opening of damping force regulation side When area gradually decreases to zero between b～d of position, sensation of frequency is made to answer the aperture area of side to be constant (maximum Aperture area), when damping force regulation side aperture area between d～e of position, be zero time, make sensation of frequency The aperture area answering side is gradually reduced, in position e vanishing.

Now, in the case of the shortening speed (or elongation speed) of supposition piston rod 3 is constant, live The damping force of stopper rod 3 can carry out table by the characteristic line 40～43 shown in Fig. 9 corresponding to the characteristic of stretching frequency Show.That is, when the turned position of gate 33 is position a, the aperture area of damping force regulation side is big, frequently The aperture area of rate sensing side is zero, and therefore, the damping force characteristic of position a can be set to relative to frequency The soft damping force as shown in the characteristic line 40 of Fig. 9 that rate does not changes.

If it addition, the turned position of gate 33 being switched to position b, then damping force regulation from position a The aperture area of side remains constant, but, owing to sensation of frequency answers the aperture area of side to increase to largest face Long-pending, therefore, the damping force characteristic of position b can be set to as shown in the characteristic line 41 of Fig. 9, at low frequency Band is soft damping force, and in high frequency band, is the softest damping force.

If it addition, the turned position of gate 33 being switched to position d, then damping force regulation from position b The aperture area of side is gradually reduced, and sensation of frequency answers the aperture area of side to be maximum area and remain constant, Therefore, the damping force characteristic of position d can be set to as shown in the characteristic line 42 of Fig. 9, in low-frequency band For hard damping force, and in high frequency band, it is soft damping force.

If it addition, the turned position of gate 33 being switched to position e, then damping force regulation from position d The aperture area of side remains zero, and sensation of frequency answers the aperture area of side to gradually decrease to zero, therefore, and position e Damping force characteristic can be set to as shown in the characteristic line 43 of Fig. 9, be hard damping force in low-frequency band, And in high frequency band, also maintain hard damping force and do not change relative to frequency.

Therefore, according to the first embodiment, as shown in the characteristic line 40～43 of Fig. 9, except declining of low-frequency band Subtract beyond power, all the damping force variable amplitude (reduction rate) of the high frequency band of each turned position of scalable, therefore, Such as when the turned position of gate 33 is set to position b, as shown in characteristic line 41, running at a low speed Time, low-frequency band is set as soft damping force, and then the function that performance sensation of frequency is answered is with in high frequency band Set softer damping force such that it is able to control the comfort mode for paying attention to ride quality.

It addition, when gate 33 being switched to position a and be set as characteristic line 40, the merit that sensation of frequency is answered OFF being in, even if also being able to maintain higher damping force near spring low-resonance frequency, therefore can Vibration etc. under spring after enough thrust (projection り gets over) is crossed in suppression.It addition, running at high speed Time, it is possible to control the motor pattern for paying attention to control stability.Set gate 33 is switched to position d When being set to characteristic line 42, it is set to the hard damping force that the ride qualities such as vibration damping on spring control to be used On the basis of, it is possible to play the function answered of sensation of frequency and suppress dither, and do not possess frequency inducing function Buffer compare, it is possible to realize higher-dimension ride quality control, or, it is possible to simpler control System realizes the ride quality of peer-level and controls.It is set as spy gate 33 is switched to position e Property line 43 time, when being set to handling maneuver roll the hard damping force that suppression etc. is used on the basis of, frequently The function of rate sensing is in OFF, it is possible to farthest play the control performance of control stability.

Thus, according to present embodiment, it is possible to by the oilhole 3D of piston rod 3,3E, the oil of gate 33 Groove 33C, 33D, the pressure chamber C of shortening side damping mechanism 4, the arc-shaped hole 7B of master 7, disk Incision hole 11B of valve 11 and the oil circuit 2B of piston 2 etc. constitute shortening side the first path.It addition, can By the oilhole 3F of piston rod 3,3G, the oil groove 33E of gate 33,33F, elongate sides damping mechanism 13 Pressure chamber D, arc-shaped hole 16B, incision hole 20B of disc valve 20 and the piston 2 of master 16 Oil circuit 2A etc. constitute elongate sides the first path.And, it is possible to by orifice members 22, the oil of piston rod 3 Hole 3C, the damping hole 33B of gate 33, endoporus 33A and housing 26 etc. constitute alternate path.

Owing to configured as described above can be regulated respectively by the gate 33 of area of passage changeable mechanism 32 The area of one path and the area of alternate path, therefore, even if becoming damping force produced by buffer More during the arbitrary characteristic in hardware features, medium characteristic and software feature, it is also possible to according to various characteristics freely Ground changes the damping force variable amplitude of the frequency induction mechanism 25 being made up of free-piston 29 etc., it is possible to suitable When realizing paying attention to the control of the ride quality of vehicle and pay attention to the control of control stability.

In this case, (pay attention to ride quality/attention to grasp according to the intrinsic characteristic of vehicle and target Handing stability etc.), it is possible to separately side, the damping area of elongate sides damping mechanism 4,13 are shortened in regulation Long-pending and determine the damping area of damping force variable amplitude of frequency induction mechanism 25.Even if it addition, being difficult to Control in the high frequency band of damping force, it is also possible to by frequency induction mechanism 25, only make damping force at high frequency band Decline, be therefore made without the control of complexity.Thus, decline (ス by the specification making control CPU ペ Star Network ダ ウ Application), constitute cheap structure, be additionally, since control frequency few, therefore in durability side Face is the most favourable.

It is arranged between the housing 26 and free-piston 29 of frequency induction mechanism 25 further, since use For the structure of the O RunddichtringO 30,31 of resistance component, therefore O RunddichtringO 30,31 is when freely Resistance can be produced such that it is able to become with smooth characteristic when piston 29 is axially displaced in housing 26 The more damping force of frequency induction mechanism 25.

It addition, the free-piston contact surface contacted with O RunddichtringO 30,31 of free-piston 29 is set For being formed at inclination arc surface 29B, 29C of the side, top and bottom of annular convex 29A, by housing 26 with The housing contact surface of O RunddichtringO 31 contact is set to be formed at the inclination circular arc of the inner peripheral surface of cylindrical portion 28A Face 28D, it is mutual on the moving direction of free-piston 29 that these tilt arc surface 28D, 29B, 29C Relatively, and tilt relative to the moving direction of free-piston 29, and there is curved surface.

It is thus possible, for instance make its bullet O RunddichtringO 31 being clipped in inclination between arc surface 28D, 29C Property deformation time, it is possible to suppression O RunddichtringO 31 deform sharp, it is possible to make it deform smooth.Further, By making the elastic deformation of the ratio of curvature O RunddichtringO 30,31 of inclination arc surface 28D, 29B, 29C Front curvature is big, it is possible to make the deformation of the O RunddichtringO 30,31 of the displacement with free-piston 29 put down Sliding, result can control damping force sleekly.

Then, Figure 10 represents second embodiment of the present invention, and the second embodiment is characterised by, adopts With shortening side the first path and elongate sides the first path is formed as the structure of shared same path.Need It is noted that in this second embodiment, for the structural element identical with above-mentioned first embodiment Giving identical reference, the description thereof will be omitted.

In figure, 71 is the piston that the second embodiment is used, institute in this piston 71 and the first embodiment The composition of the piston 2 stated is roughly the same, by be divided in inner core 1 bar side grease chamber A and bottom side grease chamber B this Two rooms.Piston 71 is formed multiple oil circuit that can be connected with bottom side grease chamber B by bar side grease chamber A 71A, 71B, these oil circuits 71A, 71B separate in the circumference of piston 71 respectively.These oil circuits 71A, 71B constitutes the primary path making fluid circulate between bar side grease chamber A and bottom side grease chamber B.

It addition, piston 71 is provided with: be formed in the way of surrounding a side opening of oil circuit 71A and become piston Annular recessed portion 71C of the downside end face of the side of 71, the radial outside being positioned at this annular recessed portion 71C and confession Ring-type valve seat 71D that the disc valve 73 of elongate sides described later is taken a seat or disseated, to surround the another of oil circuit 71B The mode of one side opening is formed at annular recessed portion 71E of upside end face of the opposite side becoming piston 71, position The ring that radial outside in this annular recessed portion 71E and the disc valve 74 for shortening side described later are taken a seat or disseated Shape valve seat 71F.

72 is the piston rod that the second embodiment is used, described in this piston rod 72 and the first embodiment The composition of piston rod 3 roughly the same, as the lower end side of the end side acorn nut 27 by housing 26 Etc. being fixed on piston 71.It addition, in the inner circumferential side of piston rod 72, the most through and be provided with: under it End-side openings is formed and makes gate 78 described later insert embedding gate load hole 72A rotationally, and from this lock The bar of the upwardly extending path of upper end side of door load hole 72A inserts hole 72B.

It addition, be provided with the multiple oilholes extended outward to footpath from gate load hole 72A on piston rod 72 72C, 72D, 72E, these multiple oilhole 72C, 72D, 72E separate respectively on axial and circumferential. In these oilholes 72C～72E, each oilhole 72C, 72D are to join in the way of bar side grease chamber A opening Putting, remaining each oilhole 72E is to configure in the way of the bottom side grease chamber B opening in inner core 1.

Wherein, each oilhole 72C of top side it is positioned at by damping hole 78B radially and gate 78 described later Endoporus 78A connection or disconnect.It addition, the oil groove that each oilhole 72D, 72E are by gate 78 described later 78C, 78D are interconnected or disconnect.It addition, the outer circumferential side at piston rod 72 is formed in the axial direction calmly Ring-type stage portion 72F of position orifice members 75 described later.

73,74 represent the disc valve as main decay valve that present embodiment uses, this disc valve 73,74 In disc valve 73 the stretching at piston rod 72 of elongate sides that arrange in the lower surface of the side becoming piston 71 In Long travel when piston 71 upwards sliding, the fluid of circulation in each oil circuit 71A is produced resistance, from And produce the damping force of regulation.It addition, the shortening side arranged in the upper surface of the opposite side becoming piston 71 Disc valve 74 in the shortening stroke of piston rod 72 when piston 71 downward sliding, at each oil circuit 71B The fluid of interior circulation produces resistance, thus produces the damping force of regulation.

75,76 it is disposed on the orifice members between stage portion 72F of piston rod 72 and piston 71, should Orifice members 75,76 is made up of the ring-type circle etc. of the chimeric outer circumferential side being arranged at piston rod 72.Aperture Parts 75 make fluid inflow and outflow between the oilhole 72C of bar side grease chamber A and piston rod 72.It addition, Orifice members 76 makes fluid inflow and outflow between the oilhole 72D of bar side grease chamber A and piston rod 72.

77 are disposed on another orifice members between piston 71 and acorn nut 27, this orifice members 77 Also it is made up of the ring-type circle etc. of the chimeric outer circumferential side being arranged at piston rod 72.Orifice members 77 makes fluid Inflow and outflow between the oilhole 72E of bottom side grease chamber B and piston rod 72.

78 is the gate that present embodiment uses, the gate described in this gate 78 and the first embodiment 33 is roughly the same, constitutes the variable open area parts of area of passage changeable mechanism 32.Gate 78 is provided with The endoporus 78A axially extended, the damping hole as opening worn outward to footpath from this endoporus 78A 78B, along gate 78 axially from this damping hole 78B and the oil groove of the outer peripheral face being formed at gate 78 78C、78D、78E.Oilhole 72D, 72E of oil groove 78C, 78D, 78E and piston rod 72 are together Constitute damping force and produce mechanism.

Oil groove 78C, 78D, 78E of gate 78 are formed by the groove being interconnected, turning according to gate 78 Dynamic position, will connect between oilhole 72D, 72E of piston rod 72 or disconnects.Here, oil groove 78C, 78E has and identical for oil groove 33D (with reference to Fig. 7) shape described in the first embodiment, oil groove 78D has and identical for oil groove 33C (with reference to Fig. 6) shape described in the first embodiment.Gate Oil groove 78C～78E of 78 and oilhole 72D, 72E of piston rod 72 and orifice members 76,77 etc. Isomorphism becomes constitutive requirements that is first path of the present invention, and this first path is arranged side by side relative to described primary path Path.

Damping hole 78B is configured at and is axially and radially going up relative with the oilhole 72C of piston rod 72 position Put, according to the turned position of gate 78, connect or disconnect oilhole 72C and endoporus 78A.Here, this Bright constitutive requirements i.e. alternate path is by the orifice members 75 that connects with bar side grease chamber A, piston rod 72 Oilhole 72C, the damping hole 78B of gate 78, endoporus 78A and housing 26 are constituted.This alternate path is The path arranged side by side relative to described primary path.

Therefore, in the second embodiment so constituted, it is also possible to obtain and above-mentioned first embodiment Substantially same action effect.Particularly, in this second embodiment, it is possible to by the oil by piston rod 72 Oil groove 78C～78E of hole 72D, 72E and gate 78 etc. constitute the first path be formed as shorten side and The same path that elongate sides shares such that it is able to simplify overall structure and make it become simple.And, energy Enough realizations more at a low price are substantially same with the effect described in above-mentioned first embodiment and first, second variation The effect of sample.

Then, Figure 11 represents third embodiment of the present invention, and the 3rd embodiment is characterised by, by Electromagnetic proportional valve solenoid constitutes the actuator of area of passage changeable mechanism, makes area of passage units of variance Axial displacement along piston rod.It should be noted that in the third embodiment, for above-mentioned first The structural element that embodiment is identical gives identical reference, and the description thereof will be omitted.

In figure, 81 is the piston rod that the 3rd embodiment is used, as shown in figure 11, and this piston rod 81 Including: the tubular bar 82 that axially extends in inner core 1, via connection member 83 and this tubular bar 82 Side (lower end side) connect and internal storage be configured with proportional solenoid 87 described later barrel-type casing 84, Releasably it is fixedly installed on the stepped stem 85 of the lower end side of this barrel-type casing 84.Another of tubular bar 82 Side (upper end side) is the jag prominent to the outside of inner core 1.

Stepped stem 85 is roughly the same with the composition of the lower side of the piston rod 3 described in the first embodiment, It is fixed on piston 2 by the acorn nut 27 etc. of housing 26.Here, the upper end side of stepped stem 85 be with Chimerism is installed on the installation base portion 85A in the big footpath of the lower end side of barrel-type casing 84.Stepped stem 85 In addition to this installation base portion 85A, remaining constitutes the piston rod 3 (with reference to Fig. 1) with the first embodiment Lower side roughly the same.

That is, in the inner circumferential side of stepped stem 85, it is provided with vertically and is formed towards its lower end side opening and make described later Embedding guiding valve sliding eye 85B inserted slidably by guiding valve 88.Slide it addition, stepped stem 85 is provided with from guiding valve Multiple oilhole 85C, 85D, 85E, 85F, 85G that hole 85B extends outward to footpath, these multiple oil Hole 85C, 85D, 85E, 85F, 85G separate respectively on axial and circumferential.These oilholes 85C～85G In, each oilhole 85C～85E is configured at the bar side grease chamber A's that is separated in inner core 1 by piston 2 Position, the position of the bottom side grease chamber B that remaining each oilhole 85F, 85G are configured in inner core 1.

Wherein, each oilhole 85C of top side it is positioned at by damping hole 88B radially and guiding valve 88 described later Endoporus 88A connection or disconnect.It addition, the oil groove that each oilhole 85D, 85E are by guiding valve 88 described later 88C is interconnected or disconnects.Each oilhole 85F, 85G are mutual by the oil groove 88D of guiding valve 88 described later Connection or disconnection.Aperture is positioned in the axial direction it addition, be formed at the installation base portion 85A of stepped stem 85 Ring-type stage portion 85H of parts 22.

86 is the area of passage changeable mechanism that present embodiment uses, and 87 is to constitute the variable machine of this area of passage The electromagnetic proportional valve of the actuator of structure 86 solenoid (hereinafter referred to as proportional solenoid (ratio ソ レ ノ イ De) 87), this proportional solenoid 87 includes: storage is arranged in the barrel-type casing 84 of piston rod 81 Tubular coil portion 87A, it is fixedly installed on the fixing torr portion 87B of the inner circumferential side of this coil portion 87A, at axle Upwards relative with this fixing torr portion 87B and be displaceably arranged at the movable ferrum of inner circumferential side of coil portion 87A Core 87C, it is fixedly installed on the take-off lever 87D of the central side of this movable core 87C, is configured at fixing torr Between portion 87B and movable core 87C and axially upward to this take-off lever 87D and movable core 87C mono- Play the spring 87E of force.

Proportional solenoid 87 is by from the outside through being powered coil portion 87A by lead-in wire 87F etc., and making can Dynamic iron core 87C resists spring 87E and axially displaced together with take-off lever 87D.Now, it is controlled so as to The axial displacement of take-off lever 87D is proportional to the current value flowing through coil portion 87A.Thus, such as Shown in Fig. 8 of one embodiment, guiding valve 88 described later is edge in the guiding valve sliding eye 85B of stepped stem 85 Axial slip.

88 is the guiding valve as variable open area parts that present embodiment uses, and this guiding valve 88 replaces the Gate 33 described in one embodiment, is slidably disposed in the guiding valve of piston rod 81 (stepped stem 85) In sliding eye 85B.The take-off lever 87D of guiding valve 88 passing ratio solenoid 87, at guiding valve sliding eye 85B Move along a straight line the most vertically.Guiding valve 88 be provided with axially extend endoporus 88A, from this endoporus 88A The damping hole 88B as opening that wears outward to footpath, along guiding valve 88 axially from this damping hole 88B is formed at ring-type oil groove 88C, 88D of the outer peripheral face of guiding valve 88.

As shown in figure 11, damping hole 88B be configured at axially and radially go up all with the oilhole of stepped stem 85 The position that 85C is relative, according to the sliding of guiding valve 88, connects or disconnects oilhole 85C and endoporus 88A.? This, the damping hole 88B and endoporus 88A of guiding valve 88, and connect with bar side grease chamber A orifice members 22, The oilhole 85C of stepped stem 85 and housing 26 etc. together constitute with the constitutive requirements i.e. alternate path of the present invention.

The oil groove 88C of guiding valve 88, according to the sliding of guiding valve 88, connects or disconnects the oilhole of stepped stem 85 Between 85D, 85E.Here, decline in the oilhole 85D of oil groove 88C and stepped stem 85,85E, shortening side Subtract the pressure chamber C of mechanism 4, the arc-shaped hole 7B of master 7, the incision hole 11B (reference of disc valve 11 Fig. 2～Fig. 4) and the oil circuit 2B etc. of piston 2 together constitute with the constitutive requirements of the present invention and i.e. shorten side first Path.

The oil groove 88D of guiding valve 88, according to the sliding of guiding valve 88, connects or disconnects the oilhole of stepped stem 85 Between 85F, 85G.Here, the decay of oil groove 88E and the oilhole 85F of stepped stem 85,85G, elongate sides The pressure chamber D of mechanism 13, arc-shaped hole 16B, incision hole 20B of disc valve 20 and the work of master 16 The oil circuit 2A etc. of plug 2 together constitutes with constitutive requirements i.e. elongate sides first path of the present invention.

Being provided with cylinder 89 in the guiding valve sliding eye 85B of stepped stem 85, this cylinder 89 is positioned at guiding valve 88 Downside (axial side), the inner circumferential side of this cylinder 89 is the part constituting described alternate path Endoporus 89A.Back-moving spring 90 it is provided with, this back-moving spring 90 between the lower end of guiding valve 88 and cylinder 89 Always guiding valve 88 is exerted a force to the take-off lever 87D side of proportional solenoid 87.

Therefore, in the 3rd embodiment configured as described above, by the output by proportional solenoid 87 Bar 87D makes guiding valve 88 sliding vertically (direct acting), as the first embodiment Fig. 8 oblique line portion 38, Shown in 39, it is possible to individually regulate described first path (aperture area of damping force regulation side) and second The path aperture area of side (sensation of frequency answer), it is possible to obtain the work substantially same with above-mentioned first embodiment Use effect.

Particularly, according to the 3rd embodiment, owing to making as the actuator of area of passage changeable mechanism 86 By proportional solenoid 87, therefore, it is possible to carry out damping force regulation continuously, it is possible to realize that precision is higher to decline Subtract power regulation, therefore available higher control effect.Further, since using the ratio spiral shell as actuator The inside (that is, the barrel-type casing 84 of piston rod 81) of inner core 1 it is contained in, therefore, it is possible to improve in spool 87 This buffer is relative to the lift-launch of vehicle, and actuator will not highlight and be installed in engine room, saves sky Between and safety.

It should be noted that in above-mentioned first, the 3rd embodiment, lead to above-mentioned shortening side first Road and elongate sides the first path are illustrated in case of being formed as same shape.But, the present invention It is not limited to this, such as, by oil groove 33C, 33D (oil groove 88C) of side and elongate sides will be shortened Oil groove 33E, 33F (oil groove 88D) make different shapes, it is also possible to obtain shortening side and elongate sides is mutual The damping force characteristic differed, such as, when elongate sides is set to hard damping force characteristic, set shortening side For soft damping force characteristic, or when elongate sides being set to soft damping force characteristic, shortening side is set to Hard damping force characteristic etc..

On the other hand, in the above-described first embodiment, logical to regulate first changeably with a gate 33 It is illustrated in case of road and the respective area of passage of alternate path.But, the present invention does not limits to In this, for example, it is possible to be configured to the first path and alternate path individually regulate respectively with respective gate From the area of passage, it is also possible to be configured to by respective gate, respective actuator is carried out rotating operation. It addition, area of passage changeable mechanism is configured to not be actuator but manually rotating operation gate.This Point is equally applicable for second, third embodiment.

It addition, in the above-described first embodiment, to arrange work between housing 26 and free-piston 29 For being illustrated in case of the O RunddichtringO 30,31 of resistance component.But, the present invention not office Be limited to this, such as, as Unexamined Patent 7-19642 publication, above-mentioned patent documentation 1 record buffer that Sample, as resistance component, it would however also be possible to employ the such as spring such as helical spring, flat spring.It addition, conduct The elastomer of resistance component is not limited to O RunddichtringO, it is possible to use cross section is tetragon, non-circular Elastic seal ring etc..This point is equally applicable for second, third embodiment.

It addition, in the respective embodiments described above, as being arranged at the buffer of the vehicles such as automobile, with hydraulic pressure It is illustrated as a example by buffer.But, the present invention is not limited to this, such as, it is possible to be applied to such as Become the buffer of the damping force adjustment type that the various machineries of vibration source, building etc. are used.

As described in the embodiments above, owing to frequency can be utilized in the high frequency band be difficult to control to damping force The effect of induction mechanism reduces damping force, therefore without carrying out the control of complexity.Thus, by controlling The specification of CPU declines, and constitutes cheap structure, further, since it is few, therefore in durability to control frequency Aspect is the most favourable.On the other hand, owing to can actuator is arranged at inside hydraulic cylinder, therefore need not Actuator is installed in luggage case, thus favourable in vehicle boarded property and secure context.

It addition, according to the present invention, free-piston is movably arranged at and is internally formed alternate path extremely In the housing of few a part of stream, and it is configured with between described housing and described free-piston to this certainly The resistance component of resistance is produced by the displacement of piston.Thus, in housing, when free-piston position vertically Resistance can be produced, it is possible to the damping force of smooth feature change's frequency induction mechanism during shifting.

It addition, according to the present invention, be made up of described resistance component spring.In this case, as above-mentioned The buffer that patent documentation 1 is recorded is such, can be by springs (resistance component) such as such as flat springs, to certainly Resistance is produced by the displacement of piston.

It addition, according to the present invention, be provided with one or more elastomer, institute between free-piston and housing State free-piston with described elastomer contact described free-piston contact surface, or described housing with Described housing contact surface at least any one mask of described elastomer contact has states free-piston relative to described Moving direction tilt face, the face of this inclination is formed by curved surface.Thus, elasticity is made at the curved surface tilted During body (such as, O RunddichtringO) elastic deformation, it is possible to suppression deformation drastically, and smoothly enter Its deformation of row, result can change the damping force of frequency induction mechanism sleekly.

It addition, according to the present invention, be provided with multiple elastomer, described freedom between free-piston and housing The described free-piston contact surface with described elastomer contact of piston, and described housing with described elasticity Body contact described housing contact surface have on the moving direction of described free-piston relative to part.By This, elastomer (such as, O RunddichtringO) is clipped in make its elastic deformation between two contact surfaces time, Elastomer can be suppressed to deform sharp, and smoothly carry out its deformation.

It addition, according to the present invention, described elastomer has: described free-piston is sent out when moving to a direction Give birth to an elastomer of compression, and described free-piston occurs compression when other direction moves Another elastomer.Thereby, it is possible to change the damping force of frequency induction mechanism sleekly.

Additionally, according to the present invention, damping force produces mechanism and has elongate sides damping force generation mechanism and shortening Side damping force produces mechanism, and the first path has: circulation in described elongate sides damping force produces mechanism Elongate sides the first path, and shortening side first path of circulation in described shortening side damping force produces mechanism, Area of passage changeable mechanism can regulate described elongate sides the first path and described shortening side the first path each The area of passage.Thus, described area of passage changeable mechanism can regulate described elongate sides the first path The area of passage, and it also is able to regulate the area of passage of described shortening side the first path.

Claims (9)

1. a buffer, it is characterised in that including:

Cylinder parts, envelope has working fluid；

Piston, it is possible to be flush-mounted in movably in these cylinder parts, this cylinder components interior is separated into two rooms；

Piston rod, end side is fixed on this piston, and the outside of the lateral described cylinder parts of the other end highlights；

Primary path, by the movement of described piston, make the working fluid two rooms in described cylinder parts it Between flow；

First path and alternate path, be set up in parallel with this primary path, by the movement of described piston, makes Flow to another room in arbitrary room the working fluid two rooms in described cylinder parts；

Main decay valve, is arranged at described primary path, the described work producing the movement by described piston The flowing making fluid carries out limiting to produce damping force；

Damping force produces mechanism, is arranged at described first path, produces the movement by described piston The flowing of described working fluid carry out limiting to produce damping force；And

Free-piston, is arranged in described alternate path, this alternate path is divided into upstream side and downstream Side；

In described first path and the midway of alternate path, it is provided with and can regulate the logical of the respective area of passage Changeable mechanism is amassed on road surface,

The described path of the respective area of passage of described first path and described alternate path can be regulated Variable area mechanism can be operated by a stick.

2. buffer as claimed in claim 1, it is characterised in that

Described area of passage changeable mechanism has in the Variable Area that the area of described first path diminishes The area of described alternate path is constant constant region domains.

3. buffer as claimed in claim 1, it is characterised in that

Described alternate path is formed in described piston rod,

Described area of passage changeable mechanism includes: is configured in described piston rod and is provided with and described piston rod The variable open area parts of opening of oilhole connection, and make these variable open area parts rotate or straight Dynamic actuator.

4. buffer as claimed in claim 1, it is characterised in that

Described free-piston can be movably arranged at and be internally formed at least of described alternate path In the housing on shunting road, between described housing and described free-piston, it is configured with the position to this free-piston Move the resistance component producing resistance.

5. buffer as claimed in claim 4, it is characterised in that

Described resistance component is spring.

6. buffer as claimed in claim 4, it is characterised in that

One or more elastomer, described free-piston it is provided with between described free-piston and described housing The free-piston contact surface with described elastomer contact, and described housing with described elastomer contact At least any one mask in housing contact surface has the face that the moving direction of the most described free-piston tilts, The face of this inclination is formed by curved surface.

7. buffer as claimed in claim 4, it is characterised in that

Between described free-piston and described housing, be provided with multiple elastomer, described free-piston with institute The housing with described elastomer contact of the free-piston contact surface and described housing of stating elastomer contact connects Contacting surface have on the moving direction of described free-piston relative to part.

8. buffer as claimed in claim 7, it is characterised in that

Described elastomer has: an elasticity of compression occurs when described free-piston moves to a direction Body, and when other direction moves, there is another elastomer of compression in described free-piston.

9. buffer as claimed in claim 1, it is characterised in that

Described damping force produces mechanism to be had elongate sides damping force generation mechanism and shortens side damping force generation Mechanism, described first path has the elongate sides first of circulation in described elongate sides damping force produces mechanism Path and shortening side the first path circulated in described shortening side damping force produces mechanism,

Described area of passage changeable mechanism can regulate described elongate sides the first path and described shortening side The respective area of passage of one path.