US1799771A - Fuel-pumping device - Google Patents

Description

April 7, 1931.

Filed Nm). 2e, 192e Il Il f Patented. Apr.' 7, 1931 PArN'r ortica LEONARD H. WHEELER, OF CHICAGO, ILLINOIS, ASSIGNOR TO STEWART-WARNER COR- PORATION, 0F CHIQAGO, ILLINOIS, A CORPORATION 0F VIRGINIA FUEL-PUMPING DEVICE Application led November 26, 1928. Serial No. 321,896.

The purpose of this invention is to provide an improved construction of a pumping device adapted for supplying fuel to an internal combustion engine adapted to be operated from the engine cam shaft, and for that purpose comprising a casing adapted to be mounted on the engine crank case. It consists inthe elements and features of construction shown and described as indicated in the claims.

In the drawings v Figure 1 is a section in vertical plane through the pumping chambers and passa-ges axial with respect to certain of them, showing the structure mounted on the engine crank case.

Figure 2 is a section at the line 2-2 on Figure 1.

Figure 3 is a' section at the line 3-3 on Figure 1.

Figure 4 is a side elevation for showing two casing members adjusted to different relative positions.

The drawings show a conventional form of pumping device as to the pumping chamber and inlet and discharge connections, including a fuel accumulating and sediment chamber on the intake line. As shown, the structure comprises two casing members, A and B, which are formed with mated faces having mated recesses, a and Zn, respectively, and having clamped between them the pumping member consisting of a diaphragm, C, which constitutes apartition between the two recesses, a and b. The recess, b, constitutes the pumping chamber which has fuel inlet passage, 20, and fuel discharge passage, 30.

These passages are formed in an extension, B", of the casing member, B, said extension projecting from an upper end portion of the member, B, and having at its under side a recess bounded by the flange, 23, for seating the upper end of a glass cup, D, which constitutes a fuel accumulating and sediment chamber, said cup making water-tight junction at its upper end with the seat formed for it at the under side of said casing extension, Bf, the same being made liquid-tight by a suitable packing gasket, 24, and the cup being clamped securely in position by familiar cess at the lower end of a downwardly projecting tubular member, 24, leading to the inlet valve, 25, for which a seat is afforded by the upper end of the tubular member,24.`

Said valve opens upwardly and is normally seated by gravity, but is provided with a spring, 26, for ensuring its seating under all circumstances; said spring reacts at its upper end upon the lower end of a plug, 27, which closes a bore, 28, made though the casing top wall for admitting the tubular member, 24, and the valve, 25, for seating at the upper end of said tubular member as described. This bore, 28, communicates with the horizontal bore, 20, above referred to as the inlet passage, leading to and discharging in the pumping chamber, b, at the upper part thereo said pumping chamber being positioned with a pumping diaphragm extending vertically and having its pumping movement horizontal.

The discharge passage, 30, leading horizontally from the extreme upper edge portion of the pumping chamber is deflected upwardly at 31 to the discharge valve, 32, for which a seat is provided by a bushing, 33,

drive-fitted in the vertical bore, 34, of an upwardly protruding boss, 35, which projects from the extension, B", of the casing member, B, the same being threaded at the upper end to receive a closure plug, 37, which serves as a stop for the upper end of a spring, 39, by which the safe seating of the valve, 32, is ensured.

The casing member, A, is formed for mounting the operating connections to the pumping member diaphragm, C, which derives its pumping movement from a cam, 40, on the engine cam shaft, 41, as hereinafter described. The connections for operating the diaphragm comprise a plunger element, 50, which constitutes the immediate kthe diaphragm,

means of actuating the diaphragm, saidplunger being secured to the center of the iaphragm, clamping at the opposite sides thereof the diaphragm reinforcing or formcontrolling disks, 51 and 52. A second plunger element comprising a plunger member, 55, is slidingly mounted in the casing at the end of the latter at which the casing is mounted on the engine crank case, into which said plunger member, 55, projects for co-operation with the cam, 40. The casing member, A, is formed as shown with the terminal portion, A1, in which the plunger, 55, is mounted, offset from the portion, A1, in which the plunger, 50, is mounted, laterally with respect to said plungers, and the two plungers which are thus offset laterally from each other, are connected with each other by a lever of the first class, 56, fulcrumed intermediate its ends in the casing at the portion, A3, thereof intermediate the two laterally offset portions, A1 and A2, of said casing. A spring, 60, is provided reacting at onel end upon C, and at the other end on the casing for yieldingly stressing the diaphragm in the direction of its feeding movement. A second spring, 61, is provided and coiled outside of the terminal portion, A1, of the casing for reacting between the casing and the plunger member, 55, for yieldingly thrusting said member outwardly for the encounter of the cam, 40, with the head of said plunger member; a washer, 61, stopped against the inner side of the head, 52, of the lunger, serves for stopping the spring, 61, or its reaction upon the plunger member, 55. The connection of the plunger member, 55, to the lever, 56, for operating connection with the plunger element, 50, and the diaphra m, C, is afforded by a third plunger mem er, 57, telescoped within the 'plunger member, 55, and connected at the inner end with the lever, 56, as seen at 56". A leather packing, 63, is provided at the end of the bore in the plunger member, 55, in which the plunger member, 57, is telescoped for absorblng the shock of the inthrust of the inner telescoped plunger member, 57, and preventing the operation from being noisy.

rlhe plunger member, 55, is provided with a slide bearing for its thrust movement, byfca bushing, 58, in the casin terminal, A1, and said plunger member is ormed with an encompassing annular recess, 59, which serves the urpose of a lubricant pocket .to which lubricant from the crank case obtains access by a port, 611 provided in the terminal, A1, at a ploint w ich is exposed in the crank case w en the pump casing is mounted in operative position on the latter. This recess serves another purpose by the shoulder, 63, which results from reducing the plunger member in diameter to form the annular recess, 59, namely, by co-operating `with stop pins, 64, 64, set into the casing terminal, A1,

member, A, to thelimit through the bushing, 58,-and projecting into the annular recess, 59.

The operation of the structure as described may be understood from the foregoin descri tion. The sprin 60, tends norma ly to hol the diaphragm, at the position shown in the drawing, ing stroke, and at that position it operates to hold the entire plunger element comprising the telescoping plunger members, 55 and 57, and the lever, 56, at the position shown in the member, 57, thrust toward the cam, 40, and thereby telescoped within the lunger member, 55. Assuming that at thls the diaphragm the cam, 40, is at t e position shown in the drawing,at inactive hase,*the plunger, 55, stands projecting rom the terminal, a1, 4of the casing of its stroke at which it is stopped by check pins, 64, 64, which are at that stage encountered by the shoulder formed by the inner end of the annular recess, 59, encompassing the plunger. sition described the plunger'memben 55, is thrust inwardly against the reaction of the a spring, 52, and positively thrusts the inner 57 in the direction for 56, to cause its opposite telescoped plunger, rocking the lever,

end to retract the plunger, 50, and the daphragm, C, which thereby receives its intake stroke which, it will be observed, is a positive stroke derived directly from the cam,40. As the cam continues its revolution from its active to its idle phase, the spring52, reacting on the plunger, 55,'causes the latter at its outer end to follow the cam until at the end of the revolution it re-occupies the initial position shown in the drawing. During the idle hase also, the spring, 60, reacting on the diap ragm, C, the latter its feeding ves stroke and causes the inner telescoped plunger, 57, to follow the lpllunger,'55, in its retracted movement. T is cycle of movement being repeated until the pump has supplied the carbureter, lling .the fuel chamber thereof, so that, when running conditions are such that the engine requirement is onl a small part of the feeding capacity of t e pump, and so that upon,the retraction of the diasition of the climax of its' pon the rotation of the cam from the po-l which is the limit of its feede drawing, that is, with the plunger ABIS fue

phragm to the full limit which is` caused by i the positive actuation of the cam, it can make only a small portion of its feeding stroke, it will be seen that the plunger member, 57, will remain in the position to which it is forced in the active phase of the cam, while the plunger member, 55, is retracted by the spring 52, in the idle phase ofthe cam. And it will be'seen, therefore, that there is a range of lost motion between the two plunger members, 55 and 57, which is necessary to accommodate the action of the pumping diaphragm whose feeding lstroke will be varied according to the yfuel requirement of the engine, permitting a feeding stroke of the diaphragm only suiicient to replace in the carbureter chamber the amount of fuel taken by the engine in the corresponding stroke of the engine piston.

Upon considering this operation it may be understood that the reason for interpos.

ing the lever, 56. between the two plunger members which it connects, instead of ai'- ranging for action ofthe cam directly upon the plunger member, 50, is to obtain the atlvantage of the positive action of the cam for the intake or suction stroke of the pumping member. diaphragm, C, and it may be under- Vstood that in taking advantage Vofthe opportunity afforded by the interposition of the lever, to offset the'plungers connected to the opposite ends of the lever from each other, it is important, in view of the necessity of keeping the fuel-accumulating chamber, D, in a position extending downward from the fuel intake passage which leads therefrom to the pumping chamber, and at the same time being able to mount the apparatus on the engine crank case at 'the varying positions which may be necessary in view of the varying form of theV engine and crank case and the position "of the cam shaft therein, that the construction should be, in a sense, flexible toadapt it to be accommodated to varying situations in the respects mentioned; and for-this purpose the two casing members, A and B, are formed at their mated faces at which they are secured together, and with respect to the means for so securing them, so. that the casing member, A, may be rotated about the axis of the diaphragm relatively to the casing member, B, through any desired angle, and the parts may be secured togetner at varying positions in the range of such rotative adjustment without in any respect affecting the operation of the parts. And similarly, the terminal of the casing arranged for mounting against the wall of the engine crank case is formed for rotative adjustment at said mounting through any desired angle from the position shown, at which the lever, 56, is shown in vertical position, to a posit-ion at which the lever shall be horizontal or in reversed vertical position. The apparatus is thus adapted to be mounted on the engine crank case with all the parts in suitable relation to each other for their operation, whether the lever, 56, is positioned vertically or at an oblique angle, and whether its actuated member is the upper or the lower, the right hand or the left hand.

Four of the different positions to which the casing member, B, may be adjusted relatively to the casing member, A, and to the engine, without angular change in the position of the casing member, A, that is, keeping said casing member, A, unchanged in position with respect to the parts which are respectively horizontal and vertical, particularly without displacing the fuel chamber, C, from the proper position relatively to the fuel passages, are illustrated in Figure 4, showing said member in full line at position I, corresponding to Figure 1, and in dotted lines at positions Il, III and IV.

And it will be seen that the possibility of thus varying the mounting of the device on the engine, without causing the fuel-accumulating chamber to be turned to an inoperative or undesirable position, is elfected by providing for securing together the two casing members at their mated flanges by bolts equally spaced apartYV in the circumference of the annular ilanges, and employing a similar expedient of securing the casing member to the engine casngpby a plurality of bolts distributed at equal angular intervals in the circle in which the bolt holes are formed in the llange of the casing terminal by which it is secured to the engine casing. And specifically, the variability of mounting in order to serve the purpose indicated is practically effected by spacing the securing bolts in both instances 45 apart, requiring therefore eight bolt holes and bolts in each flange, the position of the bolt holes of the circular group in the casing member lianges which are secured together, in respect to their relation to the vertical and horizontal diameters of the respective circular groups, being made to correspond with the positions of the bolt holes in the circular group of the flange of the terminal of the casing member by means of which it is secured to the engine and the corresponding group of bolt holes in the engine body. And it will be understood that the employment of eight bolt holes rather than any lesser number is for the purpose of providing for the an ular adjustment to posi-V tion the casing mem er, B, with its laterally offset portions, either in vertical plane or in horizontal plane, or inclined in either direction intermediately between vertical and horizontal position. And it will be understood that the invention with respect to this feature is not limited to the specific means and manner of rendering the securement and mounting rotatively variable; but that any means of adapting the parts tobe secured together and to the engine at a corresponding plurality of correspondingly angularly differentiated positions would be within the scope of this feature of the invention.

I claim 1. A pumping device for mounting on an internal combustion engine to be operated by an engine cam, said device comprising a casing containing a pumping chamber, a pumping member mounted reciprocably therein, said casing having a hollow extension at the side toward which the pumping member makes the intake stroke, and being adapted at its outer extremity for mounting at an aperture in an engine casing with its cavity lil) " Vdirection of the pumping member.

2. In the construction defined in claim 1, the hollow extension of the casing having its terminal portion in which the first plunger is mounted offset laterally with respect to the part in which the second plunger is mounted.

3. In the construction defined in claim l, the pumping chamber comprising two members having mated faces in a substantially vertical plane and having registering cavities in said mated faces and adapted to be secured together at said vertical plane, said two members being constructed and arranged with respect to the means for securing thema together for permitting relative rotation of the one with respect to the other about the axis of their registering cavities, the casing extension having its terminal portion formed for mounting and securement on ythe engine casing at varying positions of adjustment about the axis of said terminal; whereby said casing member may be arranged in mounting on the engine casing with its opposite end portions offset from each other either horizontally or vertically without changing the positlon of the other casing member.

4. A pump device for mounting on an internal combustion engine to be operated by the engine cam comprising two casing members having mated faces in a vertical plane and registering cavities in said faces respectively and adapted to be secured together at said mated faces to form by their registered cavities. a chamber for a pumping member; a pumping member operably mounted in said chamber; one of said casing members having intake and discharge passages, and a fuel" chamber interposed in the intake passage arranged for downward delivery of fuel thereinto and upward delivery of the fuel therefrom in its course toward the pumping'chamber, the other casing member comprising an intermediate portion and terminal portions extending in opposite directions from said intermediate portion, and laterally offset from each other, one of said terminal portions having the vertical face and recess for mating with the first casing member, the other of said terminal'portions being arranged for mounting on an engine casing at an aperture thereof, said terminal portions being arbe oEset laterally from each other, either I horizontally or vertically, without angular change in the position of the other casing member.

5. A pump structure for the purpose indicated having two casing members, the first comprising a pumping chamber and a liquid accumulating chamber, the second carrying the pump-operating means, said means comprising two plunger elements and movement communicating means connecting said elements, the latter being respectively connected to the pumping member and protruding for actuation by actuating means, said plunger elements being laterally offset from each other, said second, casing member being arranged for securement at one end tothe first casing member at a plane transverse to the thrust of the first plunger, and at the other end to a fixed support at a plane transverse to the thrust of the second plunger; and

means for securing said second casing member at its opposite ends arranged to afford such securement at selected positions of ad- Iiustment of said second casing member throughout an angular range of at least ninety degrees.

6. A pumping device for mounting on an internal combustion-engine to beI operated by an `engine cam comprising in combination with a reciprocable pumping member a plunger element by which said member is actuated, a second plunger element arranged to be actuated by the engine cam, the cam having an active and an idlerphase in the cycle of its rotation, said two plunger elements being laterally offset from each other,

a lever of the first class which` connects said plunger elements, a spring reacting on the pumping me y stroke, the second plunger element comprising two inter-telescoping plunger members, one 'of which is directly connected te said lever and the other of which is exposed te the action of the cam inthe active phase thereof, and a spring reacting between said last mentionedplungerwmember and the casing for causing saidplunger member to follow ber for givingit its feeding the cam in the idle phase of its cycle of rotation. 0

7 An apparatus for the purpose indicated having a casing member arranged to be intruded into the casing of an engine which the apparatus serves; a two-membered plunger whose members v-are telescoped with each other, the outer telescoped member being arranged to protrude from one end of the apparatus casing into the engine casing for cooperating with an actuating engine part,v

the inner telescoping member protruding f from the outer within the apparatus casing at the opposite end of said outer member from that at which it projects into the engine casing, said outer telescoped plunger member being reduced in diameter intermediate its ends, forming an annular encompassing recess extending for a limited distance corresponding to the -length of the plunger stroke, and a stop piny set in through the apparatus casing member which intrudes into the engine casing engaging said plunger member at said annular recess, for encounter with the shoulders formed at the opposite limits of said recess, for limiting the plunger stroke and preventing escape of the plunger member from the casingmember.

8. The construction dened in claim7, the apparatus casing member having at the portion thereof which projects within the engine casing an aperture opening atthe outer end in the engine casing cavity and at the inner end in said recess whereby access is afforded for lubricant from the engine casing to said annular recess, and the latter becomes a lubricant pocket carrying lubricant for distributing thesame over the slide bearing of the plunger.

9. In an apparatus for the purpose indicated having a casing member arranged for intruding into the casing cavity of an engine, and a two-membered plunger whose members are telescoped one within the other, the outer telescoped plunger member reciprocating in the apparatus casing member which projects in the engine casing cavity, and having intermediate its ends a portion of reduced diameter forming an annular cavity within the bearing of said plunger member in the apparatus casing member, said casing member having at a point within the engine casing cavity and within the extent of said annular cavity of the plunger member an aperture affording access for lubricant from the engine casing cavity to said annular cavity, and said plunger member having an aperture from said annular cavity to the slide bearingof the inner telescoped plunger member in the outer member.

10. An apparatus comprising a casing having a member constructed for intruding into the crank casing of an engine, and having a plunger element journaled slidingly for reciprocation in the intruded portion of the apparatus casing member, the latter having a lubricant duct leading to said slide bearing from a point on the exterior of said intruded part which is exposed within the engine crank case when the apparatus casing is mounted thereon, said plunger element having an annular encompassing recess forming a lubricant pocket, said lubricant duct leading to said pocket for supplying lubricant thereto for lubricating the slide bearing of the plunger in the apparatus casing member.

11. An apparatus comprising a casing having a member constructed for intruding into the crank case of an engine, and having a plunger element comprising two plunger members telescoped with each other, the outer telescoped member being journaled slidingly for reciprocation in the intruded portion of the apparatus casing member, the latter havin a lubricant duct leading to said slide bearing from a point on the exterior of said intruded part which is exposed within the engine crank case when the apparatus casing is mounted thereon, the outer telescoped member having an aperture located for registering its outer end with said lubricant duct of the casing member at a substantial portion o the longitudinal movement of the plunger in the casing member and at its inner end open for delivering lubricant tov the inner telescoped member.

12. An apparatus comprisino' a casing having a member constructed for intruding into the crank case of an engine, and having a plunger element consisting of two plunger mem ers telescoped one within the other, the outer telescoped member being journaled slidingly for reciprocation in the intruded portion of the apparatus casing member, the latter having a lubricant duct leading to said slide bearing from a point on the exterior of said intruded part which is exposedwithin the engine crank case when the apparatus casing is mounted thereon, the outer telescoped member of said plunger element having an encompassing recess located, and extending longitudinally thereof a distance corresponding to the stroke of the plunger, for maintaining said annularrecess in registration with sai-d lubricant duct, and having a duct ,leading from said encompassing recess for conducting lubricant to the inner telescoped member.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 20th day of November, 1928.

LEONARD H. WHEELER.

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