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Publication numberUS2588481 A
Publication typeGrant
Publication dateMar 11, 1952
Filing dateDec 13, 1944
Priority dateJul 22, 1942
Publication numberUS 2588481 A, US 2588481A, US-A-2588481, US2588481 A, US2588481A
InventorsMilton E Chandler
Original AssigneeNiles Bement Pond Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fuel injector pump mechanism
US 2588481 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

March 11, 1 952 CHANDLER 2,588,481

FUEL INJECTOR PUMP MECHANISM Original Filed July 22, 1942 I A as as l 68 47a 42 V44 L 50 1 3* 72 49 7 I 74 48 p 4| Z l o I a zzvmvron M1. TZ7N E LI /mama AGENT Patented Mar. 11, 1952 FUEL INJECTOR PUMP MECHANISM Milton E. Chandler, New Britain, Conn, ass gnor, by mesne assignments, to Niles-Bement-Pond Company, West Hartford, 'Conn., a corporation of New Jersey Original application July 22, 1942, Serial No.

451,874. Divided and this application December 13, 1944, Serial No. 568,017

19 Claims. (01. 103-41) This is a division of my co-pending application Serial No. 451,874, filed July 22, 1942, Patent No.

2,410,773, November 5, 1946, entitled Fuel Control Mechanisms.

This invention relates to fuel control mechanism, and particularly to a variable delivery fuel injector pump mechanism for supplying fuel to the cylinders of an internal combustion engine.

It has among its objects to provide an improved control mechanism for controlling the fuel supplied thru injectors to the cylinders of internal combustion engines.

A further object of my invention is to provide such an improved controlling mechanism especially adapted to use in connection with airplane engines, either of the gasoline or fuel oil operated type.

Another object is to provide improved variable delivery fuel injector pump mechanism for use on internal combustion engines generally.

Another object is to provide improved multiple unit injector pump mechanism for use on multiple cylinder engines.

Other objects and advantages of my invention will become apparent from a consideration of the appended specification, claims and drawing.

The single figure of the accompanying drawing illustrates, somewhat schematically, a preferred embodiment of my invention.

In the drawing, I have illustrated my invention.

and supplying fuel from a fuel pump 41 to an injector 5 associated with cylinder la. Only a single cylinder is shown in order to simplify the illustration.

A fluid motor 35 is provided for controlling the delivery of the injector pump mechanism 3. The fluid motor 35 includes a cylinder in which a piston 35 is movable. Fluid under pressure is supplied to the cylinder from a conduit 34. The pressure of the fluid supplied may be controlled by suitable mechanism shown and described in my co-pending application previously referred to.

The piston 36 is pivotally connected thru a suitable slotted connection 31 to the left end of .a link 38, pivoted at its right end at 39, and also pivotally connected between its ends at 48 to a longitudinally adjustable rod 4! controlling the position of adjustment of a plate valve member 42in the injector pump 3. The plate valve member 42 is reciprocable in a .fuel inlet chamber 43 in the injector pump casing. A spring 45 biases.

the plate valve member 42 downwardly, in opposition to the pressure acting on the under side of piston 35. A number of peripherally spaced plungers 44 are mounted in the injector pump casing so as to extend thru sleeves 62, which are threaded into suitable apertures in the plate valve member 42.

Each of the apertures in the plate valve member 42 in which the sleeves 62 are mounted is recessed along an intermediate portion thereof to receive a collar or outer sleeve 64, which threadedly engages the outside of the sleeve 62. By rotating the collar 64 in its recess, the sleeve 62 may be adjusted longitu inally with respect to the plate valve member 42.

Each of the plung'ers 4 is biased so that its upper end engages the wobble cam 4 by a suitable spring 66. This spring is retained between a transverse wall 68 in the injector pump casing and a retainer 19 on the plunger 44.

The right-hand injector pump 44 in the drawing is'in its uppermost position, so that fuel is free to fiow from the inlet chamber 43 thru a transverse inlet passage 46 in the plunger 44 to a central longitudinal passage 12 in the plunger which communicates with the cylinder 14 in which the plunger moves. As the wobble cam 4 rotates, the plunger 44 is pushed down a a nst the action of spring 66. Until the passageway is closed by movement into the sleeve 64, no pumping action takes place, as the pressure ahead of the plunger-44 is relieved thru the passageways l2 and 46. As soon as the passageway 46 is closed,'pressure builds up ahead of the plunger 44, and fuel is pumped out thru the check valve 48 to the cylinder associated with that plunger. As the plunger approaches its lowest position, as shown for the left-hand plunger in the drawing, a relief passageway 16 in the plunger registers with a relief port 49 in the pump casing. When this occurs, the pressure within the pump cylinder is relieved thru the passageway 76, port 19 and passage 50 to the inlet chamber 43, so that the check valve 48 closes and the injection of fuel into the cylinder ceases.

It may be seen that by reciprocating the plate valve member 42, the quantity of fuel delivered by the pumping plunger 44 on a single stroke may be varied. The position of the pump plunger at which injection begins is varied by this mechanism. The position of the pump plunger at the termination of the injection is always the same, being determined by the position of relief port 49.

Cooperating control mechanism is provided to adjust the pump delivery in accordance with variations in engine speed. A fly-ball governor 5|, carried on a suitable'engine service shaft, which may be the shaft 2a or a suitable shaft driven therefrom, is connected to a link 52 pivoted at 53 and connected thru a cross link 54 near its left end to the right end of the link 38. As a result of this connection, while the rod 4| will be operated by the piston 36 as heretofore described to adjust the valve 42, the adjustment of the latter will obviously be modified by the action of the fiy-ball governor on the link 52, the governor moving the lower pivot 39 of the link 38 in such manner as thereby to enable the speed of the engine to modify the effect of the air control and accordingly enable the mechanism to operate satisfactorily under widely varying conditions.

There is also provided additional controlling mechanism which modifies the operation of the injector pump during the idling range. This mechanism includes a cam 55 carried on the throttle shaft 56 and cooperating with an adjustable member 51 carried on the right end of the de ending link 52. The latter link is biased toward the cam by a spring 58 and also carries an adjustable stop 59 engageable with a portion 59a on the engine and which cooperates with the member 51 in determining the limits of movement of the link 52 by the cam 55. Thus, when the throttle shaft 56 is adjusted into idling position, the above control mechanism automatically decreases the fuel delivered by the injector pump 3 to the quantity desired to effect idling operation.

It will be understood that while, for illustrative pur oses. I have shown only one complete injector delivering to a single cylinder, a series of cylinders and injectors is provided, with each injector and cylinder successively supplied with a suitable charge of fuel thru t e action of the wobble cam 4. Further, it will be understood that while I contemplate the use of mv improved mechanism in connection with airplane engines havin usual ignition mechanism, my improved controlling mechanism is equally well adapted to use in any diesel type engine, which, as usual, has no such ignition mechanism and depends upon the heat of compression to ignite the charge.

While I have herein specifically described one embodiment which my invention may assume in practice. it will be understood that this has been chosen for purposes of illustration, and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

I claim as my invention:

1. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a chamber, means for supplying fuel to said chamber at a predetermined pressure, a plurality of pump cylinders, each said pump cylinder having one end opening into said chamber, a plurality of delivery conduits, each said conduit plungers being arranged circumferentially of said chamber, a plate within said chamber supported on a shaft extending axially of said chamber, said plate being apertured for the passage of said plungers therethru and being effective to close said passage means at a predetermined point in the pumping stroke of said plungers, each said plunger being effective during the portion of said pumping stroke after said passage means is closed to produce a pressure in said cylinder sufficient to overcome said check valve means and force a supply of fuel therefrom, means for sequentially reciprocating said plungers, means for positioning said shaft to adjust the point in the pumping stroke of said plungers at which said passage means are closed by said plate and thereby to control the quantity of fuel delivered on each stroke of said plungers, and means for operating said shaft positioning means.

2. Injector pump mechanism, comprising a chamber, means for supplying fuel to said chambar at a predetermined pressure, a plurality of pump cylinders, each said pump cylinder having one end opening into said chamber, a plurality of conduits, each said conduit conducting fuel from the opposite end of one of said pump cylinders, check valve means in each said conduit for preventing the flow of fuel therethru until the pressure in its associated pump cylinder exceeds a predetermined value higher than the pressure in said chamber, a plunger reciprocable in each said pump cylinder and extending into said chamber, each said plunger having passage means extending therethru and connecting said chamber and said cylinder so that said cylinder may receive fuel from said chamber thru said passage means, said pump cylinders and plungers being arranged circumferentially of said chamber, a plate Within said chamber supported on a shaft ex-' tending axially of said chamber, a plurality of valve members controlled by said plate, one valve member for each plunger, each valve member being effective to close the passage means in its associated plunger at a point in the pumping stroke thereof determined by the position of said plate, each said plunger being effective during the portion of said pumping stroke after said passage means is closed to produce a pressure in said cylinder sufficient to overcome said check valve means and force a supply of fuel thru its associated conduit, means for sequentially reciprocating said plungers to supply fuel to said conduits, and means for positioning said shaft to adjust the point in the pumping stroke of said plungers at which said passage means are closed by said valve members and thereby to control the quantity of fuel delivered to said conduits on each stroke of said plungers.

3. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a chamber, means for supplying fuel to said chamber, a plurality of parallel pump cylinders, each pump cylinder having one end opening into said chamber, a plurality of delivery conduits, each said conduit conducting fuel from the other end of one of said pump cylinders, check valve means in each said conduit for preventing the flow of fuel therethru until the pressure in its associated pump cylinder exceeds a predetermined value higher than the pressure in said chamber, a stationary wall for the side of said chamber opposite said pump cylinders, said wall having a plurality of apertures, each aperture being aligned with one of said pump cylinders, a pl n er re pr e in each Said cylinder and extending thru said chamber and the aligned aperture in said wall, each said plunger having a first passage extending axially therein from said cylinder and second and third passages extending radially therethru at spaced points, said second passages in all said plungers lying within said chamber and cooperating with their respective first passages to connect said chamber and said cylinders so that said cylinders may receive fuel from said chamber, a plate valve member carrying a plurality of sleeves within said chamber, each said sleeve surrounding one of said plungers for closing its second passage at a predetermined point in its pumping stroke, each plunger being effective during the portion of said pumping stroke after said second passage is closed to produce a pressure in said cylinder sufficient to overcome said check valve means and force a supply of fuel therefrom, each said pump cylinder having a port at an intermediate point therein, passages connecting said ports and said chamber, each said port being aligned with the third passage in its associated plunger when said plunger approaches the end of said pumping stroke so as to relieve the pressure in said cylinder and to terminate pumping by said plunger, means for moving said plate member lengthwise of said plungers to ad- 7 said plungers on their pumping strokes, and a spring for each of said plungers for biasing said plunger into engagement with said wobble cam.

4. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a chamber, means for supplying fuel to said chamber, a plurality of parallel pump cylinders, each pump cylinder having one end opening into said chamber, a plurality of delivery conduits, each said conduit conducting fuel from the other end of one of said pump cylinders, check valve means in each said conduit for preventing the flow of fuel therethru until the pressure in its associated pump cylinder exceeds a predetermined value higher than the pressure in said chamber, a stationary wall for the side of said chamber opposite said pump cylinders, said wall having a plurality of apertures, each aperture being aligned with one of said pump cylinders, a plunger reciprocable in each said cylinder and extending thru said chamber and the aligned aperture in said wall, each said plunger having a first passage extending axially therein from said cylinder and terminating in a second passage extending radially therethru at a point within said chamber, said first and second passages cooperating to connect said chamber and said cylinder so that said cylinder may receive fuel from said chamber, a plate valve member carrying a plurality of sleeves within said chamber,

each said sleeve surrounding one of said plungers for closing its second passage at a predetermined point in its pumpin stroke, each plunger being effective during the portion of said pumping stroke after said second passage is closed to produce a pressure in said cylinder suiicient to overcome said check valve means and force a supply of fuel therefrom, a third passage in each plunger extending radially therethru from said first passage to the outside of said plunger, each said pump cylinder having a port at an intermediate point therein, passages connecting said ports and said chamber, each said port being aligned with the third passage in its associated plunger when said plunger approaches the end of said pumping stroke so as to relieve the pressure in said cylinder and to terminate pumpin by said plunger, said plate valve member being movable lengthwise of said plungers to adjust the point in the pumping strokes of said plungers at which said second passages are closed and thereby to control the beginning of pumping by said plungers and hence the quantity of fuel delivered on each stroke of said plungers, means engaging said plungers on the side of said wall opposite said chamber for reciprocating said plungers, a compression spring in said chamber between said Wall and said plate, said spring biasing said plate in a direction to decrease the fuel delivery of said plungers, a rod attached to the central portion of said plate valve member and extending outside said chamber, and motor means for driving said rod to position said member against the action of said spring.

5. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a chamber, means for supplying fuel to said chamber, a plurality of parallel pump cylinders, each pump cylinder having one end opening into said chamber, a plurality of delivery conduits, each said conduit conducting fuel from the other end of one of said pump cylinders, check valve means in each said conduit for preventing the flow of fuel therethru until the pressure in its associated pump cylinder exceeds a predetermined value higher than the pressure in said chamber, a stationary wall for the side of said chamber opposite said pump cylinders, said wall having a plurality of apertures, each aperture being aligned with one of said pump cylinders, a plunger reciprocable in each said cylinder and extending thru said chamber and the aligned aperture in said wall, each said plunger having a first passage extending axially therein from said cylinder and second and third passages extending radially therethru at spaced points, said second passages in all said plungers lying within said chamber and cooperating with their respective first passages to connect said chamber and said cylinders so that said cylinders may receive fuel from said chamber, a plate valve member carrying a plurality of sleeves within said chamber, each said sleeve surrounding one of said plungers for closing its second passage at a predetermined point in its pumping stroke, each plunger being effective during the portion of said pumping stroke after said second passage is closed to produce a pressure in said cylinder sufficient to overcome said check valve means and force a supply of fuel therefrom, each said pump cylinder having a port at an intermediate point therein, passages connecting said ports and said chamber, each said port being aligned with the third passage in its associated plunger when said plunger approaches the end of said pumpin stroke so as to relieve the pressure in said cylinder and to terminate pumping by said plunger, said plate valve member being movable lengthwise of said for reciprocating said plungers, a compression assaaei spring in said chamber between said wall and said plate, said spring biasing said plate in a direction to decrease the fuel delivery of said plungers, a rod attached to the central portion of said plate valve member and extending outside said chamber, and fluid motor means for driving said rod to position said member against the action of said spring.

6. Fuel injection pump mechanism comprising a fuel inlet chamber, a cylinder opening at one end into said chamber, a plunger mounted for reciprocation in said cylinder and extending into said chamber, an inlet passage extending thru said plunger from said chamber to the other end of said cylinder, a sleeve in said chamber encirclin said plunger for closing said inlet passage, and means for reciprocating said sleeve along said plunger to vary the point in the stroke of said plunger at which said passage is closed and thereby to vary the delivery per stroke of said pump mechanism.

therethru from said chamber to the other end of its associated cylinder, a plurality of sleeves in said chamber, one for each of said plungers. each said sleeve surrounding its associated plunger to close said inlet passage, a plate member carrying all said sleeves, means for reciprocating said plate member parallel to said plungers to vary simultaneously the point in the stroke of said plungers at which said inlet passages are closed and thereby to simultaneously vary the delivery of all said plungers, and means for adjusting each of said sleeves with respect to said plate member to adjust individually the point in the stroke of its associated plunger at which its inlet passage is closed.

8. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a fuel inlet chamber, a plurality of parallel pump cylinders, each said cylinder having one end opening into said chamber, a plurality of plungers, one of said plungers being mounted for reciprocation in each of said cylinders and extending into said chamber, -each said plunger having aninlet passage extending therethru from said chamber to the other end of its associated cylinder, a plurality of sleeves in said chamber, one for each of said plungers, each said sleeve surrounding its associated end into said chamber, a plunger mounted for reciprocation in said cylinder and extending into said chamber, an inlet passage extending thru said plunger from said chamber to the other end of said cylinder, a sleeve in said chamber for closing said inlet passage, means for reciprocating said sleeve along said plunger to vary the point in the stroke of said plunger at which said passage is closed and thereby to vary the delivery per stroke of said pump mechanism, and relief passage means for terminating delivery by said pump mechanism at a predetermined point in the travel of said plunger.

10. Fuel injection pump mechanism comprising a fuel inlet chamber, a cylinder opening at one end into said chamber, a plunger mounted for reciprocation in said cylinder and extending into said chamber, an inlet passage extending thru said plunger from said chamber to the other end of said cylinder, a sleeve in said chamber encircling said plunger for closing said inlet passage, means for reciprocating said sleeve along said plunger to vary the point in the stroke of said plunger at which saidv passage is closed and thereby to vary the delivery per stroke of said pump mechanism, a relief passage beginning at a point in the wall of said cylinder adjacent said other end and terminating in said chamber, and a relief port in said plunger extending from said inlet passage therein to a point in the plunger surface which becomes aligned with said relief passage as said plunger approaches the end of its stroke, said relief passage and relief port cooperating to terminate delivery by said pump mechanism at a predetermined point in the travel of said plunger.

11. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a fuel inlet chamber, a plurality of parallel pump cylinders, each said cylinder having one end opening into said chamber, a plurality of plungers, one of said plungers being mounted for reciprocation in each of said cylinders and extending into said chamber, each said plunger having an inlet passage extending therethru from said chamber to the other end of its associated cylinder, a plurality of sleeve valve means in-said chamber, one for each of said plungers, each said sleeve valve means surrounding its associated plunger to close said inlet passage, a plate member carrying all said sleeves, and means for reciprocating said plate member parallel to said plungers to vary simultaneously the point in the stroke of said plungers at which said inlet passages are closed and thereby to simultaneously vary the delivery of all said plungers, each said sleeve valve means comprising an outer sleeve fixed against translation with respect to said plate and an inner sleeve slidably engaging said plunger and threadeclly engaging said outer sleeve so that rotation ofsaid inner sleeve causes translation of said inner sleeve along said plunger, said inner and outer sleeves being operable to adjust individually the point in theistroke of its associated plunger at which its inlet passage is closed.

12. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a fuel inlet chamber, a plurality of parallel pump cylinders, each said cylinder having one end opening into said chamber, 'a plurality of plungers, one of said plungers being mounted for reciprocation in each of said cylinders and extending into said chamber, each said plunger having an inlet passage extending therethru from said chamber to the other end of its associated cylinder, a plurality of sleeves in said chamber, one for each of said plungers, each said sleeve surrounding its associated plunger to close said inlet passage, a plate member carrying all said sleeves, means for reciprocating said plate member parallel to said plungers to vary simultaneously the point in the stroke of said plungers at which said inlet passages are closed and thereby to simultaneously vary the delivery of all said plungers, a fixed plate closing the side of said chamber opposite said cylinders and having apertures therethru to receive said plungers, cam means on the opposite side of said fixed plate for sequentially driving said plungers on their pumping strokes, and a plurality of springs, one associated with each plunger, said springs being effective to maintain said plunger-s in engagement with said cam means and to operate said plungers on their return strokes.

13. Fuel injector pump mechanism for a multiple cylinder internal combustion engine, comprising a fuel inlet chamber, a plurality of parallel pump cylinders spaced circumferentially of said chamber, each said cylinder having one end opening into said chamber, a plurality of plungers, one of said plungers being mounted for reciprocation in each of sad cylinders and extending into said chamber, each said plunger having an inlet passage extending theret-hru from said chamber to the other end of its associated cylinder, a plurality of sleeves in said chamber, one for each of said plungers, each said sleeve surrounding its associated plunger to close said inlet passage, a plate member carrying all said sleeves, a rod attached to the center of said plate member and extending parallel to said plungers, and means for reciprocating said rod and thereby said plate member to vary simultaneously the point in the stroke of said plungers atwhich said inlet passages are closed and thereby to simultaneously vary the delivery of all said plungers, said reciprocating means comprising a spring biasing said plate member in a direction to decrease the delivery of said plungers, and motor means for moving said rod and thereby said plate member in opposition to said spring.

14. Fuel injection pump mechanism comprising a fuel inlet chamber, a plurality of reciproeating fuel pumps extending and opening into said chamber, means for simultaneously varying the fluid expelling strokes of said pumps, and reciprocable sleeve means for individually adjusting the fuel expelling stroke of each pump.

15. Fuel injection pump mechanism according All 10 to claim 14 wherein the fuel expelling stroke adjusting means is operatively associated with the fuel expelling stroke varying means.

16. Fuel injection pump mechanism according to claim 14 wherein the fuel expelling stroke adjusting means is mounted upon the fuel expelling stroke varying means.

17. Fuel injection pump mechanism comprising a fuel inlet chamber, a plurality of pump cylinders opening into said chamber, a plunger reciprocally mounted in each of said cylinders and extending into said chamber, a fuel passage extending thru each of said plungers, a, sleeve in said chamber embracing each of said plungers for closing one end of said fuel passage, means for simultaneously reciprocating said sleeves along said plungers for varying the point in the strokes of said plungers at which said passages are closed and means for individually adjusting the point in the stroke of each plunger at which its passage is closed.

18. Fuel injection pump mechanism according to claim 17 wherein the passage closing point adjusting means are operatively associated with the sleeve reciprocating means.

19. Fuel injection pump mechanism according to claim 17 wherein the passage closing point adjusting means are mounted upon the sleeve reciprocating means.

MILTON E. CHANDLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Evans Aug. 7, 1948

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2889781 *Nov 30, 1954Jun 9, 1959Sabre Res CorpFuel pump
US2910056 *Sep 27, 1956Oct 27, 1959Thompson Ramo Wooldridge IncFuel injection pump
US3225610 *Oct 9, 1963Dec 28, 1965Porsche KgCam shaft drive arrangement for internal combustion engines
US3361077 *Jun 21, 1965Jan 2, 1968Lucas Industries LtdPumps
US3649134 *Jul 2, 1970Mar 14, 1972Constantin RauchControl apparatus for limiting the power received by a plurality of adjustable hydraulic pumps
US5603609 *Aug 17, 1995Feb 18, 1997Microhydraulics, Inc.Variable delivery swash plate pump having a piston located spill port
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Classifications
U.S. Classification417/270, 417/494, 417/289
International ClassificationF04B1/14, F02M59/04, F02M41/08
Cooperative ClassificationF04B1/14, F02M41/08, F02M2700/1329, F02M59/04
European ClassificationF02M59/04, F02M41/08, F04B1/14