US3308799A - Devices for varying the beginning of delivery in fuel injection pumps - Google Patents

Devices for varying the beginning of delivery in fuel injection pumps Download PDF

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Publication number
US3308799A
US3308799A US409054A US40905464A US3308799A US 3308799 A US3308799 A US 3308799A US 409054 A US409054 A US 409054A US 40905464 A US40905464 A US 40905464A US 3308799 A US3308799 A US 3308799A
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United States
Prior art keywords
cylinder
piston
jack
main
delivery
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Expired - Lifetime
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US409054A
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English (en)
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Bessiere Pierre Etienne
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
    • F02M41/128—Varying injection timing by angular adjustment of the face-cam or the rollers support

Definitions

  • the present invention relates to devices for varying the beginning of delivery in a pump for the injection of fuel (fuel oil, gasoline, kerosene, etc.) into an internal combustion engine whereby the time at which fuel is injected into the cylinder or cylinders of said internal combustion engine is varied.
  • fuel fuel oil, gasoline, kerosene, etc.
  • the invention is more particularly concerned with pumps including a single cylinder cooperating with either a single piston having a reciprocating movement or two pistons having opposed reciprocating movements, said pumps serving to feed fuel successively to the cylinders of a multicylinder internal com-bustion engine.
  • the distributing means may be constituted either by the pump piston itself which has, in addition to its reciprocation axial movement, a movement of rotation about its axis, or by a distinct rotating element.
  • the beginning of every delivery stroke of the pump is angularly varied (thus producing a variation of the beginning of injection) by an angular displacement of that of the cooperating elements (cam and roller-carrier) which is not driven by the shaft of the pump.
  • the means known up to this time to ensure said locking during the delivery stroke of the piston or pistons either do not ensure a sufiiciently accurate position to the angularly movable element or are bulky and occupy a lot of space.
  • the object of the present invention is to provide simple locking means while ensuring a very accurate positioning of the angularly movable element, such positioning being 3,308,799 Patented Mar. 14, 1967 not modified by the reaction acting on the piston during its delivery stroke.
  • a closing member which is controlled positively in accordance with the reciprocating movements of the piston or pistons of the injection pump, and this in such manner that it closes said conduit during every delivery stroke of said piston or pistons and that it opens this conduit at least during a portion of time elapsing be tween two consecutive delivery strokes.
  • this closing member is a slide valve itself controlled hydraulically by a liquid delivered by the piston of the fuel injection pump or by the piston of an auxiliary pump working in synchronism with said injection pump.
  • FIG. 1 diagrammatically shows, in longitudinal section, a fuel injection pump according to the present invention
  • FIG. 2 is a cross sectional view on the line 11-11 of FIG. 1.
  • the pump illustrated by the drawing serves to feed fuel to several delivery conduits leading respectively to several injectors, mounted on the respective cylinders of an internal combustion engine.
  • the shaft 1 of the pump is driven by this engine with a speed proportional to the engine speed.
  • This shaft 1 drives a transverse bar 2 provided, at the respective ends thereof, with rollers 3 applied by a spring 4 against a cam 5 housed in the frame 6 of the pump in such manner that said cam 5 is normally stationary with respect to said frame 6 but can however have angular displacements about the axis of shaft 1 under the action of a device which will be hereinafter described.
  • Cam 5 has four bosses corresponding to four successive fuel injections to be performed during a complete rotation of transverse bar 2 with respect to cam 5.
  • Transverse bar 2 is rigid with the pump piston 7, Which cooperates with a cylinder 8 provided in frame 6 and in which said piston is movable. Piston 7 therefore rotates together with transverse bar 2 and has, also together with said transverse bar, axial reciprocating movements, under the action of cam 5.
  • Shaft 1 is coupled with transverse bar 2 through a fork 9 provided at the end of shaft 1, this fork controlling the rotation of bar 2 but permitting axial displacements with respect thereto of bar 2 and piston 7.
  • Delivery conduits 11 are distributed about the axis of cylinder 2 and each of them is provided with a check valve 12.
  • the two annular grooves 13 and 14 are provided in piston 7 and connected together by an axial passage 15 formed inside piston 7.
  • the working chamber 8 of the pump cylinder 8 is constantly in communication with annular groove 13 through a longitudinal groove 16 provided in the side wall of piston 7. This longitudinal groove 16 places working chamber 8,, during the successive delivery strokes of piston 7 into communication with the respective delivery conduits 11, whereby piston 7 acts as a distributing valve.
  • FIG. 1 shows piston 7 at the end of its upward stroke that is to say in its upper dead center position, where it connects working chamber 8,, through longitudinal groove 16, annular groove 13, passage 15 and annular groove 14, with feed conduit 10. Consequently, the delivery of fuel through one of the conduits 11 ceases when the comspeed of the engine.
  • groove 13 is located opposite feed conduit 10, so that the working chamber 8, of the cylinder can be again filled with fuel.
  • leak passage 25 controlled by a slide valve'27 which is placed, on the one hand under the action of the pressure of the liquid delivered by pump 23 (which pressure tends to increase the cross section of the leak passage) and on the other hand under the action of a return spring 28 tending to reduce the cross section of the leak passage.
  • the chief object of the present invention is to prevent the pressure of the fuel discharged by piston 7 during every delivery stroke thereof from producing, by reaction, transmitted through rollers 3, upon cam 5, a modification of the angular position of cam 5 determined by the jack.
  • valve means are inserted in the conduit 24 which transmits the pressure produced by pump 23 to the cylinder 18 of the jack, said valve means consisting of a sliding member 29 controlled, in accordance with the reciprocating movements of piston 7, in such manner as to close said conduit during the delivery strokes of said piston 7 and to open this conduit at least for a portion of time elapsing between two successive delivery strokes of said piston 7.
  • control of slide valve 29 takes place through an auxiliary pump, the piston 30 of which moves in synchronism with the piston 7 of the main pump.
  • this piston 30 is integral with piston 7 and cooperates with a cylinder 31, also provided in the pump frame 6, coaxial with cylinder 8.
  • Cylinder 31 is of a diameter greater than that of cylinder 8.
  • the working chamber of cylinder 51 and the active surface of piston 30 are of annular shape.
  • Cylinder 31 is fed with liquid from a feed conduit 32 and liquid is discharged from said cylinder 31 through a conduit 33 interposed between cylinder 31 and a cylinder 34 extending across the delivery conduit 24 of pump 23, preferably close to jack 17-18.
  • - glide valve 29 is slidable in cylinder 34 against the action or a return spring 35.
  • piston 30 Furthermore, there is provided in piston 30 an annular groove 36 which, when pistons 7 and 30 are in upper dead center position, connects a conduit 37 communicating with the delivery conduit 33 of auxiliary pump 30-31 with a conduit 38 itself in communication with the feed conduit 32 of said auxiliary pump 30-31. V
  • cylinder 34 the cross section of which is small as compared with the annular cross section of cylinder 31, is further provided with a discharge conduit 39 which determines the end of the displacement of slide valve 29 toward the right when said slide valve is displaced by the liquid delivered by auxiliar pump 30-31.
  • conduit 39 on eylindei 3 4 is do: termined in said manner that whe rl slide Valve'29 stops, due to the fact that said conduit 39 is cleared, slide Valve 29 is in a position such that it closes conduit 24;
  • This movement of slide valve 29 is practically instan taneous due to the'fact that the active cross section of the working chamber of cylinder 31 is much greater than the cross section of cylinder 34.
  • Tue closing of conduit 24 by slide valve 29 has for its effect to entrap the liquid filling the space between the end of the jack cylinder 18 and the jack piston 17 and does not permit piston 17 to move back and earn 5 to be displaced under the effect of the reaction exerted by piston 7-13 upon cam 5 during the delivery stroke of piston 7.
  • the angular position of cam 5 therefore remains unchanged during this delivery stroke.
  • the locking of jack 17-18, obtained according to the present invention during every delivery stroke of piston 7, has the advantage of keeping cam 5 exactly in the position where it has been brought inaccordance with the speed of the engine,and this in a simple manner and without bringing into play voluminous means.
  • jack 17-18 is not necessarily tangential with respect to cam 5.
  • This jack may act upon said cam through any intermediate means.
  • the hydraulic jack acts of course upon the roller-carrier.
  • the cam and the roller-carrier may be made of a shape different from that above described.
  • a fuel injection pump system for feeding fuel to an internal combustion engine which comprises, in combination,
  • said elements being angularly movable with respect to each other about said axis to adjust the beginning of fuel injection on every piston stroke
  • a hydraulic jack including a jack cylinder and a jack piston movable in said jack cylinder to form therewith a variable volume chamber, for controlling the angular position of said two elements with respect to each other,
  • liquid feeding means responsive to a pressure variable in response to variations of the speed of said internal combustion engine, for feeding liquid to said jack cylinder, said liquid feeding means including a pipe opening into said jack cylinder and forming the only communication between said variable volume chamber and the outside,
  • auxiliary pump operatively connected with said main piston and said main cylinder for working in synchronism with the relative axial displacements of said main piston and said main cylinder
  • a fuel injection pump system according to claim 1 wherein said main piston is adapted to connect said main cylinder with a discharge space at the same time as said discharge conduit is opened.
  • a fuel injection pump system for feeding fuel to an internal combustion engine which comprises, in combination,
  • a hydraulic jack operatively connected with said cam for controlling the angular position thereof about said axis
  • an auxiliary pump including a cylinder rigid with said main cylinder, and a piston rigid with said main piston,
  • conduit means connecting the delivery of said auxiliary pump with said slide valve cylinder so as to push said slide valve across said pipe and to close it in response to every delivery stroke of said auxiliary pump.
  • a fuel injection pump system for feeding fuel to an internal combustion engine which comprises, in combination,
  • rolling means carried by said piston and journalled with respect thereto about an axis perpendicular to said axis of symmetry and fixed with respect to said piston, said rolling means being adapted to cooperate with said cam
  • a hydraulic jack operatively connected with said cam for controlling the angular position thereof about said axis
  • an auxiliary pump including a cylinder rigid with said main cylinder and a piston rigid with said main piston
  • conduit means connecting the delivery of said auxiliary pump with said slide valve cylinder so as to push said slide valve across said pipe and to close it in response to every delivery stroke of said auxiliary pump.
  • a fuel injection pump system for feeding fuel to an internal combustion engine which comprises, in combination,
  • said elements being angularly movable with respect to each other about said axis to adjust the beginning of fuel injection on every piston stroke
  • a hydraulic jack including a jack cylinder and a jack piston movable in said jack cylinder to form therewith a variable volume chamber, for controlling the angular position of said two elements with respect to each other,
  • said liquid feeding means responsive to a pressure variable in response to variations of the speedof said internal combustion engine, for feeding liquid to said jack cylinder, said liquid feeding means including a pipe opening into said 'jack cylinder and forming the only communication between said variable volume chamber and the outside,
  • an auxiliary pump including an auxiliary cylinder and an auxiliary piston adapted to cooperate with said auxiliary cylinder and working in synchronism with the relative axial displacements of said main piston and said main cylinder,
  • a fuel injection pump system according to claim 5 wherein the cross section of said cylindrical housing is smaller than the cross section of said auxiliary pump 10 piston.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US409054A 1963-11-14 1964-11-05 Devices for varying the beginning of delivery in fuel injection pumps Expired - Lifetime US3308799A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR953761A FR1387115A (fr) 1963-11-14 1963-11-14 Dispositif pour faire varier le début du refoulement d'une pompe d'injection de combustible

Publications (1)

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US3308799A true US3308799A (en) 1967-03-14

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US409054A Expired - Lifetime US3308799A (en) 1963-11-14 1964-11-05 Devices for varying the beginning of delivery in fuel injection pumps

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US (1) US3308799A (de)
AT (1) AT253302B (de)
DE (1) DE1258181B (de)
FR (1) FR1387115A (de)
GB (1) GB1091679A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374685A (en) * 1965-02-20 1968-03-26 Eheim Franz Face cam disc and cam follower arrangement
US3447520A (en) * 1966-06-06 1969-06-03 Cav Ltd Liquid fuel pumping apparatus
US3665907A (en) * 1969-04-22 1972-05-30 Bosch Gmbh Robert Device for adjusting the timing in fuel injection pumps
US3815564A (en) * 1971-03-06 1974-06-11 Nippon Denso Co Fuel injection device for internal combustion engines
US4111173A (en) * 1976-03-10 1978-09-05 Lucas Industries Limited Fuel pumping apparatus
US4177775A (en) * 1977-07-01 1979-12-11 Robert Bosch Gmbh Fuel injection pump

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100903A (en) * 1976-12-13 1978-07-18 Stanadyne, Inc. Rotary distributor fuel injection pump
DE2923445A1 (de) * 1979-06-09 1980-12-18 Bosch Gmbh Robert Steuereinrichtung fuer eine kraftstoffeinspritzpumpe
DE3212524A1 (de) * 1982-04-03 1983-10-13 Spica S.p.A., Livorno Verbesserung der spritzzeitverstellsystem bei einer einspritzpumpe, insbesondere bei einer steuerkolbenpumpe
US4711220A (en) * 1984-11-02 1987-12-08 Daimler-Benz Aktiengesellschaft Pressure oil guide device for injection pump shaft
DE3520667C2 (de) * 1984-11-02 1986-10-16 Daimler-Benz Ag, 7000 Stuttgart Druckölzuführvorrichtung für einen mit einer Einspritzpumpe zusammenwirkenden hydraulisch betätigten Spritzversteller
DE3543151A1 (de) * 1985-08-16 1987-02-26 Daimler Benz Ag Druckoelzufuehrvorrichtung fuer einen mit einer einspritzpumpe zusammenwirkenden hydraulisch betaetigten spritzversteller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863438A (en) * 1956-07-09 1958-12-09 Napier & Son Ltd Timing of fuel injection pumps

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB656906A (en) * 1947-08-11 1951-09-05 Roosa Vernon D Fuel pump
FR1201506A (fr) * 1958-03-01 1959-12-30 Perfectionnements apportés à des régulateurs de vitesse hydrauliques, notamment pour des pompes d'injection de combustible
FR1319973A (fr) * 1962-04-20 1963-03-01 Cav Ltd Pompe à combustible liquide

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863438A (en) * 1956-07-09 1958-12-09 Napier & Son Ltd Timing of fuel injection pumps

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374685A (en) * 1965-02-20 1968-03-26 Eheim Franz Face cam disc and cam follower arrangement
US3447520A (en) * 1966-06-06 1969-06-03 Cav Ltd Liquid fuel pumping apparatus
US3665907A (en) * 1969-04-22 1972-05-30 Bosch Gmbh Robert Device for adjusting the timing in fuel injection pumps
US3815564A (en) * 1971-03-06 1974-06-11 Nippon Denso Co Fuel injection device for internal combustion engines
US4111173A (en) * 1976-03-10 1978-09-05 Lucas Industries Limited Fuel pumping apparatus
US4177775A (en) * 1977-07-01 1979-12-11 Robert Bosch Gmbh Fuel injection pump

Also Published As

Publication number Publication date
FR1387115A (fr) 1965-01-29
DE1258181B (de) 1968-01-04
GB1091679A (en) 1967-11-22
AT253302B (de) 1967-04-10

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