US2998828A - Slide plate type volume control valve - Google Patents

Description

Sept. 5, 1961 R. c. HARE sLTOE PLATE TYPE VOLUME CONTROL VALVE 2 Sheets-Sheet l Filed Sept. 8, 1958 FIG.2.

INVENTOR. RIUHAHD C HABE Sept. 5, 1961 R. c. HARE SLIDE PLATE TYPE VOLUME CONTROL VALVE Filed Sept. 8, 1958 2 Sheets-Sheet 2 l w "l: 39 33373540 /Z T-/ 39 38 37 36 INVENTOR.

RICHARD l1 HABE BY 5% 1 77.%

United States Patent 2,998,825 SLIDE. PLATE TYPE VOLUNIE .y `CONTRGL VALVE Richard C.' Hare, Wauwatosa,V Wis.,k assignor fo' Dynex, Inc., Pewaukee,. Wis., av corporation loit' Wisconsin- Filed, Sept. 8,.195.8,.Ser; No. 759,477. 1 Claim. (Cl. 137,62f5;2'5)

This invention relates generally tol hydraulic mechanisms and'in particular to pressure iluid. control valves, of the. slide plate type -for controlling the. volume. of pressure, fluid ilow which is being delivered: to a. source of utilization from several sources of pressure fluidV supply.

It. is object of the present invention to provide a volumev control valve for selectively directing .the owof pressure fluid which is being delivered` from sever-al sources lto a common loadv or source of utilization. The inventionifurtherfcontemplates theuse of: such a valve with a multi-piston pump having separate discharge conduits.

'Iheinlvention provides a valve of the above type which is economical to manufacture and ethcient in performing its intended functions.

'llhese and other objects and advantages will appear later as disclosure progresses, reference being had to the accompanying drawings, in which;

FIGURE 1 is a side view of a valve made in accordance with the present invention;

U FIGIURE Z is a plan view of the valve shown in FIG- FIGURE 3 is a perspective view in the valve shown in FIGURE l;

FIGURE 4 is an axial sectional view of a hydraulic pump with Iwhich the present invention nds particular utility; and

FIGURE 5 is a schematic view of the pump shown in FIGURE 4 Iwhen used with the valve of the present invention.

Referring in greater detail to the drawings, the valve 9 made in accordance with the present invention is of the slide plate type and includes three plate members 10, 11 and 12 which are suitably finished and secured together by any suitable means, such as cap bolts (not shown) to thereby form a valve body. The central plate member 11 has a large rectangular opening 14 formed in its central portion which defines a valve chamber in this valve body. End plate contains the cylinder port C, tank port T and pressure port P2. End plate 12 contains the pressure ponts P1 and P3. As best shown in FIGURE l, all of these ports are in communication with the valve chamber and terminate therein in spaced apart axial alignment. The tank port is located at one side of the pressure inlet ports and the lload port C is located at the opposite side of the inlet ports.

A slide plate [i6 is reciprocable in the chamber and is hnished to provide a slidable sealing tit therein. The plate 16 is secured to a control rod 17 through which of the slide plate used i-t is shifted by any suitable means (not shown). Plate 16 has two elongated and aligned ports or slots 20 and 211 extending therethrough which are selectively registerable with the porting in the plate members 10 'and 12, as will appear more fully hereinafter.

In FIGURE '4 there is shown a hydraulic pump 22 with which the present invention finds particular utility. Such a pump is fully described in the co-pending U.S. application of David T. Blair, Serial No. `661334, led

May 24, 1957, now Patent No. 2,941,475, issued June 21, 1960, entitled Hydraulic Pump, :and assigned to the assignee of the present application. It is thought sucient to say, tor purposes of this disclosure, that the' pump has a plurality of pumpingchambers 24 in which the pistons 25 are reciprocated by the rotatable wobble plate 26 Ato etfect suction strokes when Ithe pistons are moved to the lett (as viewed in FIG, 4) and pumping strokes when they'larefrcedto the right.` In4 the illustration chosen 'for'purposes of; this? disclosure, the' pump has siirr pumping chambers which; are adapted to bein communication, viafoutlet'check'valves 27' and cross bores 28; witha common dischargey outlet 29. Alternatively; the dischargetrom each"` ofthe pumping chambersy may be made to pass independently-@trom the pump viaanisolating valve assembly 30; `instead of to the common port 29v as when the regular valve plug assemblyA 31'v is used:

When fourv of theseisolating' valvesv 30 are` used; as best shown in FIGURE 5; the discharge from theremaining two'- chambers is discliargedi through' .the conduit 32 that is connectedA to 'the-common discharge port 29; The isolating valves are paired upto the conduits 33 and 34? so as to give three separate ows of' pressure fluid;

In certaiulfliydraulic circuits itl may be desirable to selectively direct. pant or' all of." the pump ldischargeI to-'a common source of utilization. In other words, it may be desirable to Jdirect the discharge 'from some of the chambers to the work and the discharge from the remaining chambers to the tank, or elsewhere.

The volume control valve 9 provided by the present invention permits a iixed displacement pump of the above type to furnish pressure ii-uid as does a variable volume pump. 'Iihe pressure fluid is furnished in steps or graduations, `that is, in the example shown, in multiples ot two pumping chambers.

As the invention has been shown, the three separate lines of fluid pressure 32, 33 andV 34 are in communication with the pressure ponts P2, P1 and P3, respectively, of the valve. Figure 5 showsV the slide .plate 16 posiitoned to direct the discharge of all three conduits 32, 33 and 34 to the load via slot 21 and conduit C. In this position the conduit T leading to the tank or elsewhere is blocked, and the entire pump output is used to penform work.

By progressively moving the plate 16 to the left, the conduits 33, 32 and 34 may in that order be made to discharge via slot 20 into the conduit T rather than into the conduitC. When the plate is moved to the extreme left position, all of the ow will be dumped to the tank via slot 20 and conduit T, and the conduit C will be blocked.

Detents 36 to G9 are formed in the plates 10 and 12 and the spring loaded balls 40 in the aperture 41 of the slide plate selectively engaged these detents when, respectively, the plate is positioned to deliver all the iluid, fluid from conduits 32 and 34, fluid from only conduit 34, and none off the iluid, to the conduit C. Thus the plate is positively located in any one of its flow directing steps.

By having two separate porting slots 20 and 2x1, as shown, the pump flow may be `directed entirely or partially to either the load or the tank; or a portion of the entire ilow may simultaneously be directed to both the work and tank. y

While .the illustration chosen for purposes ot this disclos-ure shows a six-cylinder pump'with suitable conduits tol provide three discharge pressure lines communicating with a valve having three pressure inlets, a pump having any number of separate pumpingchambers Vmay be utilized and the ilow therefrom divided into vari-ous numbers of conduitsfor communication with a valve having result in an ecient valve having minimum leakage probf lems. p

Various modes of carrying out the invention are contemplated as being the scope of the following claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention.

Iclaim: -f Y `A hydraulic iluid volume control valve comprising,Y a central plate having a,rectang1.1la:t opening therethrough, a side plate sealingly secured to each of opposite sides of said central plate to thereby deline a valve body having a chamber therein, a series of uid pressure inlet ports extending through said body and communicating with said chamber in -alignment with one another, a load port extending through said body from said chamber at one side of said inlet ports, a tank port extending through said body from said chamber at the other side of said inlet ports, and a slide plate sealingly reciprocable within said chamber and having a pair of elongated porting slots therethrough which are in alignment with one another in respect to the direction of slide platereciprocation, the arrangement being suoh that when said slide plate is at one limit of its travel one of said slots registers with all of said inlet ports and with said load port, and when said slide plate is at the other limit of its travel the other of said slots places said tank port in registration with all of said inlet ports.

References Cited in the tile of this patent UNITED STATES PATENTS 975,240 Hicks NOV. 8, 1910 2,074,618 Roeder Mar. 23, 1937 2,247,261 Towler et al June 24, 1941 2,252,141 Seidel et al Aug. l2, 1941 2,536,486 Berry Ian. 2, 1951 `I2,568,356 Moulden Sept. 18, 1951 2,617,257 Douglas Nov. A11, 1952 2,696,788 Funston Dec.` 14, 1954 2,797,706 Harrison July 2, 1957 2,858,851 HollV Nov. 4,11958 2,951,505 Hare Sept, 6,1960 2,964,058 Fuente Dec. 13, 1960 FOREIGN PATENTS 966,043 France Mar. 1, 1950

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