US2464196A - Fuel pump - Google Patents

Description

FUEL PUMP Filed Aug. l0, 1945 IN V EN TOR.

HTraH/VE KS.

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Patented Mar. 8, 1949 UNITED STATES TENT OFFICE V, 2,464,136@4 FUEL PUMP l Cornel-ins VanrRansltDearborn, Mich. A Appunti@ August 16, 194.5, Sernin. 616,076 24 claims. (ci. 10s-15o) The invention relates generally.tointernalfcombustion engines and it has particular relation to a fuelpump; v f ,q

,.'luel pumps employing pulsating diaphragms are generally used in motor-vehicles .for the purpose of supplying'fuel tothe carburetor. These pumps are operated, as alrule, bycam means on the, engine cam shaft.-;'I`l'ie` present invention is concerned with a fuel pump of this general character. v l

-Oneobject of the invention is-to provide an im* provedi type offfuel pump employing a pulsating diaphragmv-Wherein the inlet and-outlet valves are arranged ina-unitary subassembly which may be inexpensively manufactured and readily installed... v 7 ,i

,Y Another object of the invention is to provide an improved type of'fuelfpump whereinn the valve assembly and diaphragm are held inA position between two separablepartsof the casing whereby assembly of the parts is simplied and facilitated. another object o f the invention is to provide a fuel pump having'an -improvedltering means which may readily be inserted and removed. f

Another objectr of the-invention is to provide a fuel 'pump which is so constructed that vapor chambers arerprovided both at the inlet and outlet sidesof the pump. ,i Y' f Other objects of the invention will'become apparent from .the followingspeciiication, from the drawings-relating thereto, and from the claims hereinafterset-,forth .Y t l. 1

For a better understandingY ofn'the Vinvention reference may be had tothel drawings wherein:

figure, y1 is a cross-sectional View illustrating a fuelpump constructed according to one form of the invention;V fr v .-Fig. 2 is a plan View of the structure shown by Figp-l; and;` 'L i* l M i f .igt-3, is aA vside elevational view partly-in crosssection, showinga pump constructed according to another form of the invention.`

`l'eierring to Fig. l, the vpump comprises a casingfhaving a-lower part lli and an upper part II, and these parts offthe casinghave iianges I2. and i3 fastened together by screws I4.l The casing thus provided isidivided by a diaphragm I6 having a Kmarginal portion I] fclamped ,between the anges i2 and i3. This diaphragm is constructed oixsuitable material euch'as alsynthetic rubber having a high resistance to the action of hydrocarbon fuels, it is iiexible sothat it may be moved relative. to its marginal portion..` The diaphragmV-is'vheld between vtwo metalfdisks I8 and I9, and these are connected at their centers by a pin having collars 2| and 22 at opposite sides of the'disks. A t 1 x Y y `A spring` 24: encircling thepin normally urges the-diaphragm upwardly land such spring at its upper end engages the disk I9 and at its lower end it seats in a recess 25 ina lower wall 26 of the part l2 ofthe casing. Below the diaphragm, the pin 2b projects downwardly through a tubular boss 27 projectingupwardlyrfromthe'wall 26 and the lower end of the pin is flattened and is provided with an elongated eye-28. The end of the pinfis located within an'rauXiliary chamber 29 in part l? of l'the casing andfwithin this auxiliary cham-v ber a bell crank 3B vis located. This bell crank is pivoted on a-pin 3l A`journalled in opposite walls ofwthe auxiliarychamber 29 and one `end of the bell crank projects through the eye 28 in the The bell crank is normally urged ina counterclockwise'` direction by a spring 32 engaging at one en'dale'g 34 onthe-bell crank, and at its other end aseat 35 on the-'casing wall. A socket 38 is carried by the opposite'endof the bell crank and such socket is-'adapted to be-moved by 'a stem 40 operating frcmthe cam shaft. From the construction so `far described, it `should be evidentv that iii-'the `pin 40 is'ireciprocat'ed, the bell crank likewise'will be reciprocatedfand in turn the diaphragm will be moved upwardly and downwardly.- At the same time, it should be evident that if the diaphragm f is held' in a lower position by fuel pressure above the diaphragm, the bell crank can continue its movements 'due' 'alto the elongated opening'Z, and vif the pressureis suflicient the diaphragm may remain idle: It follows also that the. stroke of the diaphragm may be progressively shortened as the pressure above the diaphragm increases.

' The parti I of the casing includes an inner Wallv 4I which forms an'outer'vapor and fuel chamber 43 and Van inner vapor and Ifuel chamber 44. Fuelf'entersfthe inner-chambers by means of a fuel inlet 45 andthen flows through the chamber 44 and'then downwardly into the chamber 43.

Flow ofthe fuel from the one chamber into the other is controlled by'a vaivesubassembly which comprises ana upwardly bowed metal disk 48 hav` ing a marginal portion 49 clamped between the flanges'i 2 `and i3; and if desired va gasket 50 may be` provided between the marginal portion of the disk and thelange i3. It is evident that the edge ot-the diaphragm acts vas-aseal at the opposite side oi the disk.' At it's'center, the valve disk 48 has an upwardly'projectingtubular projection 52 and this tubular projection terminates in a reduced bore 53 so as to provide a valve seat 54. The bore 53 is adapted to be closed by a valve plate 55 which is urged upwardly by a spring 56, and this spring in turn rests on the base of an inverted cup shaped element 51 press fitted into the lower part of the projection 52. The base of the cup is provided with a plurality of openings 69 so that fuel may flow through the cup. The valve plate 59 constitutes the inlet valve and when it is unseated, fuel flows downwardly past the plate and through the openings 66 to the space above the diaphragm.

Fuel is adapted to iiow upwardly through the disk 48 and into the chamber 43 through a plurality of outlet openings 62 in the disk, and these openings are adapted normally to be closed by a ring plate 64 surrounding the tubular projection 52 on the disk. This ring plate is urged downwardly by a tapered ycoil spring 65 seating at its lower end against the ring plate and having its Y upper end coil contracted into an annular groove -66 in the wall of the tubular projection.

In order to seal the upper end of the tubular projection 52 to the inner wall 4I of the casing, the lower end of the latter has an upwardly and inturned conical wall portion 19 and a synthetic rubber sealing ring 1I is provided on the upper end of the tubular projection for engagement with the tapered wall. At its upper end the conical wall 10 joins a cylindrical Wall 19 and the latter terminates in a smaller cylindrical portion 14 thereby providing a shoulder 15. This shoulder supports a cylindrical filter 1-6 having a lower end plate 'l1 resting on the shoulder and an upper end plate 19 which is pressed downwardly by a spring 89. The filter and spring are slidably mounted on the cylindrical portion of the upwardly projecting housing and the spring is normally urged downwardly by a cover 8l at the upper end of the chamber 44. This cover is secured in place by a screw 82 which is threaded downwardly into the upper end of the cylindrical portion 14. A plurality of slots 83 in the wall of portion 14 permit the fuel to flow from the chamber 44 into the cylindrical portion 14.

When the diaphragm moves downwardly, the valve plate 55 is drawn from its seat and fuel flows past this plate into the space above the daphragm. All fuel entering the inlet 45, of course, passes through the filter 1B before it can flow downwardly past the valve plate 55. On the upward movement of the diaphragm, the valve plate closes and then the pressure of the diaphragm on the fuel forces the ring plate 64 upwardly to allow the fuel to flow into the chamber 43. From this chamber the fuel flows through an outlet 85 shown in Fig. 2 which communicates with the lower part of the chamber 43.

It is evident that the upper parts of the chambers 43 and 44 serve as vapor chambers so as to minimize vapor lock both at the inlet and outlet sides of the pump. It is also evident that the lter may easily be installed and replaced simply by removing the screw 82. Also it is evident that the valve assembly is,carried entirely on the disk 48 and thus it may be easily installed and replaced. Assembly of all the parts may be affected by placing the valve assembly and diaphragm in position and then placing the upper casing part Il in position and then securing the two parts of the casing together by the screws I4.

The construction shown by Fig. 3 has the same diaphragm and valve assembly and filter arrangement as that shown by Fig. 1. However, in this case the lower end of the pin Ell'engages one arm of a bell crank pivoted as indicated at 9| in the lower part of the casing and the opposite end of this bell crank indicated at 92 is engaged by a pin 93 slidable in a tubular part 94 -of the casing. The outer end of this pin has a head 95 engaged by a cam 96 on the cam shaft in the engine and the pin normally is urged against the cam by a coil spring 91 seating against the head 95 on the pin and against a collar 98 on a sleeve 99. This sleeve is mounted in the tubular portion 94 and serves as a bearing for the pin 93. In other respects the fuel pump functions the same as the construction disclosed in Fig. 1.

Although more than one form of the invention has been illustrated and described in detail, it will be apparent to those skilled in the art that various modifications may be made Without departing from the scope of the claims.

What is claimed is:

l. A fuel pump comprising a casing having an annular outer Wall and an annular inner wall forming chambers one within the other, the inner wall having a tapered wall portion at one end, a valve plate extending across the casing at one end of the chambers and connected to the outer wall, means sealing the plate to the tapered wall at the end of the inner chamber, and means for effecting a pump action to force fuel from one of the vchambers to the other.

2. A fuel pump comprising a casing having an annular outer Wall and an annular inner Wall forming chambers one within the other, the inner wall having a tapered Wall portion at one end, a valve plate extending across the casing at one end of the chambers and connected to the outer Wall, means sealing the plate to the tapered wall at the lend of the inner chamber and comprising a rubber sealing ring carried by the 40 plate and engaging the tapered wall, and means for effecting a pump action to force fuel from one of said chambers to the other.

3. A fuel pump comprising a casing having an annular outer Wall and an annular inner wall forming chambers one within the other, the linner wall having a tapered wall portion at one end, a valve plate extending across the casing at one end of the chamber and connected to the outer wall, means sealing the plate to the tapered wall, valve means for controlling the flow of fuel between the chambers and the space at the side of the plate opposite the chambers, and means for effecting a pump action to force fuel from one of said chambers to the other.

4. A fuel pump comprising a casing having an annular outer wall and an annular inner Wall forming chambers one within the other, the inner wall having an inwardly turned, annular flange at one end, a vtubular filter disposed in the inner chamber and seated on said flange, cover means closing the other end of the inner chamber, and means for effecting a pump action to force fuel from one of said chambers to the other.

5. A fuel pump comprising a casing having van annular outer wall and an annular inner wall forming chambers one within the other, the inner wall being reversely turned at one end to provide an inner tubular post and the post being apertured to allow fuel to flow through the wall thereof, a tubular lter. disposed on said post within the inner chamberand means for effecting a pump action to force fuel from one of said chambers to the other. V

6. A fuel pump comprising a casing having an annular outer wall and an annular inner wall 'bers to the other.

`l'. A fuel pump comprising a casing including two parts having cooperating flanges, a diaphragm, a valve plate disposed adjacent to said diaphragm on one side thereof, both said diaphragm and said Valve plate extending transversely of said casing and having their marginal portions secured between said cooperating fianges, said diaphragm and said valve plate cooperating to define a space therebetween, said casing defining inlet anc". outlet chambers at the side of said plate remote from said diaphragm,

`inlet and outlet valve means carried by said plate so that Vfuel may be drawn from said inlet chamber through said inlet valve means into said space when said diaphragm is moved in one direction and `'then lforced out of said space through said outlet valve means into said outlet chamber when `said diaphragm has moved in the opposite direction, and means for pulsating the diaphragm.

8. In a fuel pump a housing comprising an upper housing member and a lower housing member, a pumping diaphragm, a plate member, said diaphragm and .said plate member being disposed within said housing and having peripheral portions supported between said housing members, said plate member being recessed to form a pumping chamber, said upper housing member dening an inlet chamber and an outlet chamber comprising a vapor dome extending upwardly from said pumping chamber, an inlet valve mounted on said plate member, and an outlet check valve removably secured to the upper side of said plate to separate the pumping chamber from the' Vapor dome.

9. A fuel pump comprising a housing including first and second housing members, one of said members having inlet and outlet chamber portions, a pumping diaphragm, an apertured plate `membery said diaphragm and said plate member being disposed within said housing and supported between said housing members and defining a pumping chamber, and inlet and outlet valve means mounted on said plate member adapted to Acontrol communication between said'inlet and outlet chamber portions and said pumping chamber.

10. A fuel pump comprising a housing including first and second housing members, one of said members having inlet and outlet chamber portions, a pumping diaphragm, an apertured plate member, said diaphragm and said plate member vbeing disposed within said housing and supported Abetween said housing members and defining a pumping chamber, and means carried by said plate and including inlet and outlet valve means adapted to control communication between said inlet and outlet chamber portions and said pumpl ing chamber and means extending between said through said pumping chamber.

11. A fuel pump comprising a housing includ- ,1 ing upper and lower housing members, said upper housing lmember having an inlet chamber portion and an' outlet chamber portion, a pumping diaphragm, a plate member having an annular sealengagerncnt with said. diaphragm and cooperating therewith inwardly of said engagement to define a .pumping chamber, said plate and said diaphragm being disposed within said housing and supported between said housing members, and inlet and outlet valve means mounted on .said Lplate member adapted to control communication between said inlet and outlet chamber portions and said pumping chamber.

12. A fuel pump comprising a housing including upper and lower housing members, said upper housing member having an inlet chamber portion ,and an 4.outlet chamber portion, a pumping diaphragm, a vplate member having an annular sealing engagement `with said diaphragm, said plate member being disposed above said dia- -piiragmand having a portion inwardly of said en `sagement offset upwardly to fc a pumping aamber, said .plate and said diaphragm being rdisposed within said housing and supported between said housing members, and inlet and outlet valve .means on said plate member adapted to control communication between said inlet andoutlet chamber portions and pump- ;ing v chamber.

13. A fuel pump comprising a housing including upper and lower housing members, said upper housing ymember having an inlet chamber por- -tion and an outlet chamber portion, a pumping diaphragm, a -plate member having an annular sealing engagement with said diaphragm, said plate member being disposed :above said diaphragm and having a portion inwardly of said ,engagement offset upwardly and cooperating with saiddiaphragm to define a pumping chamber,

Said plate and said diaphragm being disposed within. said housing andsupported between said housing members, inlet and outlet valve means mounted on said plate member adapted to conltrol communication between said inlet and outlet vchamber portions and said pumping chamber,

said housing members having registering flange portions, `said plate and said diaphragm having `peripheralportionsf disposed between said anges, yand means for securing said iianges together to gripsaid peripheral portions.

14. A fuel pump comprsinga housing including anupper housing member and a lower housing membena pumping. diaphragm, a plate member, said diaphragm and. said plate member being havinga `central opening therethrough and other openings@ therethrough inl spaced relation to said -central openingvalve means on said plate member disposed between said upper housing member A,and said pumping chamber, said valve mea-usincluding' .means controlling communication between said chamber and said upper ho men .ber through said central opening and means con- -r trolling communication .between said chamber and saidupper housing member.` through said other` openings.

l5. A fuel pump comprising a housing includ- 'ing an` upper housing member having inlet and loutlet chamber portions and a lower housing member, a pumping diaphragm, a plate member,

Vsaiddiaphragm and said plate member being disposed within said housing and interposed between vsaid housing members, said plate member being recessed toform a pumping chamber andA having 7 a central opening therethrough adapted to communicate with one of said chamber portions and having other openings therethrough adjacent said central opening and adapted to communicate with the other of said chamber portions, valve means on said plate member disposed between said upper housing member and said pumping chamber, said valve means including means controlling communication between said pumpingv chamber and one of said chamber portions through said central opening and means controlling the flow of uid between said pumping chamber and the other of said chamber portions through said other openings.

16. A fuel pump comprising a housing including an upper housing member and a lower housing member, a pumping diaphragm, a plate member, said diaphragm and said plate member being disposed within said housing and supported between said housing members, said plate member being of substantially uniform thickness, and having a central opening therethrough and other openings therethrough in spaced relation to said central opening, said plate member having an 01T- set portion forming a pumping chamber and terminating at its inner periphery in a cylindrical portion surrounding said central opening, valve means on said plate member including means mounted on said cylindrical portion for controlling the flow of fluid between said pumping chamber and said upper housing member through said central opening in one direction and means for controlling the flow of fluid between said pumping chamber and said upper housing member through said other openings in the opposite direction.

17. A fuel pump comprising a housing including an upper housing member having an inlet chamber portion and an outlet chamber portion and a lower housing member, a pumping diaphragm, a plate member, said diaphragm and said plate member being disposed within said housing and supported between said housing members, said plate member being of substantially uniform thickness and having a central opening therethrough and other openings therethrough in spaced relation to said central opening, said central opening being adapted to communicate with one of said chamber portions and said other openings being adapted to communicate with the other of said chamber portions, said plate member having an offset portion forming a pumping chamber and terminating at its inner periphery in a cylindrical portion surrounding said central opening, valve means on said plate member including means mounted on said cylindrical portion for controlling the flow of fluid between said pumping chamber and said one of said chamber portions through said central opening in one direction and means for controlling the flow of iluid between said pumping chamber and said other of said chamber portions through said other openings in the opposite direction.

18. A fuel pump comprising a casing including a pair of housing members and means for holding said housing members together, said casing having an outer annular wall and an inner annular wall forming chambers one within the other, a valve plate extending across the casing and having its marginal portion gripped between said housing members, spring pressed valve means on the plate for allowing fuel to flow through the plate in one direction from one chamber, spring pressed valve means on the plate for allowing fuel to flow through the plate in the otherkdi- Arection to the other chamber, annular means sealing said inner wall to said valve plate around one of the valve means, and means for effecting a pump action to force fuel from one of said chambers to the other.

19. A fuel pump comprising a casing including a pair of housing members and means for holding said housing members together, said casing having an outer annular wall and a concentric inner annular Wall, said Walls forming a central inlet chamber and an annular outlet chamber surrounding said inlet chamber, a valve plate eX- tending across the casing and having its marginal portion gripped betwen said housing members, spring pressed valve means on the plate for allowing fuel to flow through the plate in one direction from said inlet chamber, spring pressed valve means on the plate for allowing fuel to flow through the plate in the other direction to said outlet chamber, annular means sealing said inner wall to said valve plate around one of the valve means, and means for effecting a pump action to force fuel from said inlet chamber` to said outlet chamber 2D. A fuel pump comprising a casing including a pair of housing members and means for holding said housing members together, said casing having an outer annular Wall and an inner annular wall forming chambers one within the other, the outer chamber having an upper annular portion aifording a pressure dome, a valve plate extending across the casing and having its marginal portion gripped between said housing members, spring pressed valve means on the plate for a1- lowing fuel to flow through the plate in one direction from one chamber, spring pressedlvalve means on the plate for allowing fuel to iiow through the plate in the other direction to the other chamber, annular means sealing said inner wall to said Valve plate around one of the valve means, and means for effecting a pump action to force fuel from one of said chambers to the other.

2l. A fuel pump comprising a casing including a pair of housing members and means for holding said housing members together, said casing having an outer annular wall and an inner annular wall forming chambers one within the other, a valve plate extending across the casing and having its marginal portion gripped between said housing members, a diaphragm extending across said casing and having its marginal portion gripped between said housing members, said yplate and said diaphragm cooperating to define a pumping space, spring pressed valve means on the plate for allowing fuel to iiow through the plate in one direction from one chamber, spring pressed valve means on the plate for allowing fuel to flow through the plate in the other direction to the other chamber, annular means sealing said inner wall to said valve plate around one of the valve means, and means for eifecting a pump action to force fuel from one of said chambers to the other.

22.. A fuel pump comprising a pair of housing members' having cooperating annular anges and providing inner and outer concentric wall portios, the inner of said wall portions defining an inlet passage and said wall portions cooperating to dene an annular outlet passage surrounding said inlet passage, a unitary valve subassembly adapted to control the flow of fluid through said passages and comprising a mounting plate eX- tending transversely of said passages and having vits peripheral portion gripped between said flanges, said mounting plate having an inlet opening adapted to communicate with said inlet passage and a plurality of outlet openings adapted to communicate with said. outlet passage, and inlet and outlet valve means adapted to open and close said openings, and means for eiecting a pumping action to force uid through said pump.

23. In a fuel pump having a pair of housing members having cooperating annular' iianges and defining an inlet passage and an annular outlet passage surrounding said inlet passage, a unitary valve subassembly adapted to control the flow of uid through said passages and comprising a mounting plate having a peripheral portion adapted to be gripped between said flanges and having an inlet opening adapted to communicate with said inlet passage and a plurality of outlet openings adapted to communicate with said out let passage, and inlet and outlet valve means e adapted to open and close said openings.

24. In a fuel pump having a pair of housing members having cooperating annular flanges and defining an inlet passage and an annular outlet passage surrounding said inlet passage, a unitary CORNELIUS W. VAN RANST.

The following references of record in the of this patent:

UNITED STATES PATENTS Name Date 986,122 Astrom Mar. 7, 1911 1,489,348 Hampton Apr. 8, 1924 1,888,322 Lanctot Nov, 22, 1932 2,036,452 Babitch et al Apr. 7, 1936 2,344,287 Crevelling Mar, 14, 1944 2,389,159 Lawther Nov. 20, 1945 FOREIGN PATENTS Number Country Date 454,110 France 1913 520,903 Great Britain 1940

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