US3500749A - Liquid fuel pumping apparatus - Google Patents

Liquid fuel pumping apparatus Download PDF

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Publication number
US3500749A
US3500749A US712789A US3500749DA US3500749A US 3500749 A US3500749 A US 3500749A US 712789 A US712789 A US 712789A US 3500749D A US3500749D A US 3500749DA US 3500749 A US3500749 A US 3500749A
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United States
Prior art keywords
passage
fuel
piston
pumping
bore
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Expired - Lifetime
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US712789A
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English (en)
Inventor
Kenneth Albert Walters Kemp
Terence Redvers Wheeler
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CAV Ltd
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CAV Ltd
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Publication date
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Publication of US3500749A publication Critical patent/US3500749A/en
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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
    • F02M41/14—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 rotary distributor supporting pump pistons
    • F02M41/1405—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 rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
    • F02M41/1411—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 rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
    • F02M41/1422—Injection being effected by means of a free-piston displaced by the pressure of fuel

Definitions

  • LIQUID FUEL PUMPING APPARATUS Filed March 15, 1968 mm Q N E Q kid [#7319 KENNETH AW. KEMP ET AL 031M, PM I 477319147 United States Patent 3,500,749 LIQUID FUEL PUMPING APPARATUS Kenneth Albert Walters Kemp, Ealing, London, and
  • This invention relates to liquid fuel pumping apparatus for supplying fuel to internal combustion engines and of the kind comprising in combination, a pumping piston recpirocably accommodated within a bore, means for moving the piston in a direction to reduce the volume of the pumping chamber defined by the piston and bore, and a passage extending from said chamber and through which fuel flows from the pumping chamber to the engine.
  • the object of the present invention is to provide such an apparatus in a simple and convenient form.
  • the passage extends from the side wall of the bore and is arranged to be completely covered by the piston at the end of the movement thereof in said one direction, the covering of the passage serving to create an hydraulic lock in the pumping chamber thereby to halt the piston at a predetermined position.
  • a body part 10 in which is mounted a rotary cylindrical distributor member 11.
  • the distributor member is coupled to an input shaft not shown and is arranged to be driven in timed relationship with the engine to which fuel is to be supplied.
  • a transverse bore 12 in which is mounted a pair of reciprocable plungers 50.
  • an annular cam 51 surrounding the distributor member at this point is an annular cam 51 and having a plurality of diametrically disposed inwardly extending cam lobes.
  • rollers 52 As the distributor member rotates the cam lobes act on rollers 52 respectively the rollers imparting inward movement to the plungers.
  • the plungers 50 together with the cam and rollers define a pressure pump.
  • the transverse bore 12 is in communication with one end of a bore 13 which extends longitudinally within the distributor member.
  • the opposite end of the bore is closed by means of a plug 14 and this end of the distributor member is coupled to the rotary part of a fuel feed pump 15.
  • the outlet of the feed pump is in com- 'rnunication with a passage 16 formed within the body part and the inlet of the feed pump communicates with a source of fuel.
  • the passage 16 is in communication with an annular feed gallery 17 which is formed on the body part and from which at one point, extends a cylindrical chamber 18. This chamber accommodates an angularly movable throttle member 53 which is arranged to proportion the flow of fuel through a pair of passages 19, 20.
  • the passage 19 communicates with an annular passage and passages 19a and these together with the passage 20 ext nd to the cylindrical bore in the body part in which the distributor member 11 is mounted.
  • passage 21 is provided and for registration with the passage 20 a passage 22 is formed in the distributor member.
  • the passages 21 and 22 communicate with the opposite ends of the bore 13. The communication between the passages 19a, 20 and 21, 22 is arranged to take place during the filling stroke of the apparatus.
  • a reciprocable pumping piston 23 mounted within the bore 13 is a reciprocable pumping piston 23 having an annular groove 24 defined in its periphery intermediate its ends. Moreover, the end portions of the pumping piston are of reduced diameter.
  • the space defined by the pumping piston, the bore 13 and the plug 14 constitutes a pumping chamber 25 and from this chamber extends a delivery passage 26.
  • the delivery passage is arranged to register in turn as the distributor rotates, with a plurality of outlet ports 27 formed in the body part and in communication respectively with nozzles 54 mounted so as to direct fuel into the combustion chambers respectively of the associated engine.
  • a spill path which is constituted by a radial passage 27a which is in communication with the outlet passage 26 by means of a longitudinal groove 28 formed on the periphery of the distributor member, the groove 24 formed in the pumping piston 23 and a further radial passage 29 extending from the bore 13 at a point axially removed from the passage 27a.
  • the further radial passage 29 during an injection stroke of the apparatus communicates with a spill port 30 defined in the body part.
  • another radial spill passage 31 is formed in the distributor member and extends from the bore 13 at a point axially removed from the passage 29.
  • the passage 31 is arranged to register during an injection stroke of the apparatus, with a spill port 32 formed in the body part and Which is provided with a pressurising valve 55.
  • each outlet port is provided with a delivery valve 56 which is spring loaded and which opens to permit the flow of fuel to the injection nozzles.
  • the delivery valve 56 closes and in so doing a predetermined small quantity of fuel is urged in the reverse direction to that in which it flows during the delivery of fuel to the engine to provide rapid relief of pressure at the injection nozzle to terminate delivery abruptly but to retain a controlled residual pressure in the delivery pipe.
  • the groove 24 on the pumping piston 23 is exposed to the radial passage 27a. Moreover, the groove 24 is exposed to the further radial passage 29 and this is in communication with the spill passage 30. The result of this is that the pressure of fuel within the pumping chamber is relieved and the delivery valve 56 closes. The fuel which is forced back by the delivery valve flows through the spill path previously defined and in addition to this quantity of fuel the surplus fuel from the pumping chamber 25 also flows through the spill path.
  • the pumping piston continues its movement towards the plug 14 and during this movement the effective area of the spill path is reduced so that the rate at which fuel can flow through the spill path is reduced.
  • the reduction in the area of the spill path is brought about by the fact that the groove 24 is moving out of register with the further radial passage 29.
  • the end of the pumping piston is covering the delivery passage 26 and as soon as this passage is completely covered by the pumping piston an hydraulic lock is created in the pumping chamber 25.
  • the hydraulic lock prevents further movement of the pumping piston and this is brought to a halt in a pre determined position.
  • surplus fuel contained within the bore 12 and the end of the bore 13 in communication therewith flows through the passages 31 and 32, past the pressurising valve 55 which is located in this passage.
  • the restriction of the spill passage as described minimises the risk of cavities forming in the respective outlet ports 27 when the delivery valves 56 therein contact their seats.
  • the closing of the delivery passage 26 to create an hydraulic lock in the pumping chamber likewise prevents cavitation in this chamber.
  • the pumping piston At the end of the injection stroke the pumping piston is therefore in a predetermined position and there are no cavities in the pumping chamber, so that the quantity of fuel which flows through the passage 22 during the next filling stroke is exactly the quantity of fuel which will be supplied to the engine during the next delivery stroke neglecting the leakage which takes place.
  • a liquid fuel pumping apparatus for supplying fuel to internal combustion engines and comprising in combination, a pumping piston reciprocably accommodated Within a bore, means for moving the piston in a direction to reduce the volume of the pumping chamber defined by the piston and the bore, and a passage which extends from the side wall of the bore and which is arranged to be completely covered by the piston at the end of the movement thereof in said one direction, the covering of the passage serving to create a hydraulic lock in the pumping chamber thereby to halt the piston at a predetermined position, said passage serving to convey fuel from the pumping chamber to the associated engine, and a spill path from said passage and which is opened by the piston at a predetermined point during its movement in said one direction towards said predetermined position, the opening of said spill path halting the flow of fuel through said passage.
  • the apparatus as claimed in claim 1 including a nonreturn delivery valve which opens to allow fuel to flow through said passage but which closes when the piston opens the spill path said spill path being progressively restricted as the piston moves towards said predetermined position.
  • said means comprises a pressure pump which is actuated in timed relationship with the associated engine, and which delivers fluid under pressure to one end of the piston to effect movement thereof in said one direction, a further spill path being provided to spill surplus fluid from the pressure pump when said piston assumes its predetermined position.
  • said further spill path includes a pressurizing valve which acts to maintain a predetermined pressure of fluid at said one end of the piston during the spillage of surplus fluid.

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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)
US712789A 1967-03-28 1968-03-13 Liquid fuel pumping apparatus Expired - Lifetime US3500749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB04059/67A GB1210233A (en) 1967-03-28 1967-03-28 Liquid fuel injection pumping apparatus

Publications (1)

Publication Number Publication Date
US3500749A true US3500749A (en) 1970-03-17

Family

ID=10034255

Family Applications (1)

Application Number Title Priority Date Filing Date
US712789A Expired - Lifetime US3500749A (en) 1967-03-28 1968-03-13 Liquid fuel pumping apparatus

Country Status (5)

Country Link
US (1) US3500749A (enrdf_load_stackoverflow)
DE (1) DE1601985A1 (enrdf_load_stackoverflow)
ES (1) ES352423A1 (enrdf_load_stackoverflow)
FR (1) FR1556902A (enrdf_load_stackoverflow)
GB (1) GB1210233A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712761A (en) * 1969-10-03 1973-01-23 Cav Ltd Liquid fuel injection pumping apparatus
DE3017275A1 (de) * 1980-05-06 1981-11-12 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer selbstzuendende brennkraftmaschinen
US4450813A (en) * 1981-08-28 1984-05-29 Hitachi, Ltd. Distribution type fuel injection pump
US4478188A (en) * 1981-03-26 1984-10-23 Robert Bosch Gmbh Adjustable hydraulically operated stop
US4488526A (en) * 1981-09-28 1984-12-18 Hitachi, Ltd. Fuel injection pump for internal combustion engine
US4492200A (en) * 1982-05-14 1985-01-08 Hitachi, Ltd. Fuel pumping apparatus
US4840162A (en) * 1987-06-13 1989-06-20 Robert Bosch Gmbh Fuel injection pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5756660A (en) * 1980-09-22 1982-04-05 Hitachi Ltd Fuel injection pump
IL66140A (en) * 1982-06-25 1983-09-30 Meir Oren Device for holding and storing articles

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281045A (en) * 1936-02-19 1942-04-28 Prec Mecanique Soc Pump
US2698580A (en) * 1950-01-26 1955-01-04 Cav Ltd Pump
US3027843A (en) * 1955-12-23 1962-04-03 Prec Mecanique Piston pumps, in particular for feeding fuel to internal combustion engines
US3099219A (en) * 1958-05-19 1963-07-30 Bessiere Pierre Etienne Self-regulating reciprocating piston pumps, in particular for the injection of fuel into internal combustion engines
US3115838A (en) * 1961-11-11 1963-12-31 Bosch Gmbh Robert Adjustable fuel injection pump
US3320893A (en) * 1965-05-14 1967-05-23 Bosch Gmbh Robert Regulated injection pump
US3356031A (en) * 1965-01-07 1967-12-05 Cav Ltd Liquid fuel pumping apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281045A (en) * 1936-02-19 1942-04-28 Prec Mecanique Soc Pump
US2698580A (en) * 1950-01-26 1955-01-04 Cav Ltd Pump
US3027843A (en) * 1955-12-23 1962-04-03 Prec Mecanique Piston pumps, in particular for feeding fuel to internal combustion engines
US3099219A (en) * 1958-05-19 1963-07-30 Bessiere Pierre Etienne Self-regulating reciprocating piston pumps, in particular for the injection of fuel into internal combustion engines
US3115838A (en) * 1961-11-11 1963-12-31 Bosch Gmbh Robert Adjustable fuel injection pump
US3356031A (en) * 1965-01-07 1967-12-05 Cav Ltd Liquid fuel pumping apparatus
US3320893A (en) * 1965-05-14 1967-05-23 Bosch Gmbh Robert Regulated injection pump

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712761A (en) * 1969-10-03 1973-01-23 Cav Ltd Liquid fuel injection pumping apparatus
DE3017275A1 (de) * 1980-05-06 1981-11-12 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer selbstzuendende brennkraftmaschinen
US4478188A (en) * 1981-03-26 1984-10-23 Robert Bosch Gmbh Adjustable hydraulically operated stop
US4450813A (en) * 1981-08-28 1984-05-29 Hitachi, Ltd. Distribution type fuel injection pump
US4488526A (en) * 1981-09-28 1984-12-18 Hitachi, Ltd. Fuel injection pump for internal combustion engine
US4492200A (en) * 1982-05-14 1985-01-08 Hitachi, Ltd. Fuel pumping apparatus
US4840162A (en) * 1987-06-13 1989-06-20 Robert Bosch Gmbh Fuel injection pump

Also Published As

Publication number Publication date
FR1556902A (enrdf_load_stackoverflow) 1969-02-07
DE1601985B2 (enrdf_load_stackoverflow) 1980-08-14
GB1210233A (en) 1970-10-28
ES352423A1 (es) 1969-07-01
DE1601985A1 (de) 1970-10-29

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