US3427979A - Liquid fuel pumping apparatus for supplying fuel to internal combustion engines - Google Patents

Liquid fuel pumping apparatus for supplying fuel to internal combustion engines Download PDF

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Publication number
US3427979A
US3427979A US620962A US3427979DA US3427979A US 3427979 A US3427979 A US 3427979A US 620962 A US620962 A US 620962A US 3427979D A US3427979D A US 3427979DA US 3427979 A US3427979 A US 3427979A
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United States
Prior art keywords
bore
fuel
shuttle
pumping
spill
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Expired - Lifetime
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US620962A
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English (en)
Inventor
Kenneth Albert Walters Kemp
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CAV Ltd
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CAV Ltd
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Publication date
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Publication of US3427979A publication Critical patent/US3427979A/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

  • a pumping apparatus including an injection pump which supplies liquid fuel to an outlet by way of a bore, the bore having a shuttle slidable therein, the movement of the shuttle due to fuel leaving the injection pump being limited by a stop, and valve means being provided which opens when the shuttle hits the stop to permit excess fuel to escape from the injection pump.
  • This invention relates to liquid fuel pumping apparatus for supplying fuel to internal combustion engines and has for its object to provide such an apparatus in a simple and convenient form.
  • An apparatus in accordance with the invention comprises in combination, an injection pump which is arranged to be driven in timed relationship with an engine with which the apparatus is associated, the injection pump having a pumping chamber which is in communication with one end of a bore, an outlet passage extending from the other end of said bore and through which fuel can flow to the engine during a pumping stroke of the injection pump, a shuttle slidable within said bore, the shuttle being arranged to be moved towards said other end of the bore by fuel expelled from the pumping chamber during a pumping stroke of the injection pump, a stop for limiting the movement of the shuttle towards said other end of the bore, and a spill path from said one end of the bore, said spill path being arranged to be opened to permit surplus fuel from the pumping chamber to escape from said one end of the bore when the shuttle contacts the aforesaid stop.
  • FIGURE 1 is a sectional side elevation of one example of a liquid fuel pumping apparatus in accordance with the invention and FIGURES 2, 3 and 4 show modifications of part of the apparatus of FIGURE 1.
  • a body part having mounted therein a rotary distributor member 11 which is adapted to be driven in timed relationship with an engine with which the apparatus is associated.
  • a transverse bore in which are mounted a pair of reciprocable pumping plungers 12.
  • an annular cam ring 12a Surrounding the pumping plungers is an annular cam ring 12a on which are formed inwardly directed pairs of cam lobes, the lobes of each pair being diametrically opposed to each other.
  • the cam lobes together with the pumping plungers define an injection pump having a pumping space defined between the plungers.
  • a feed pump 13 which in use supplies fuel under pressure to a feed conduit 13a formed in the body part.
  • a bore 14 Extending longitudinally within the distributor is a bore 14 one end of which communicates with the pumping chamber of the injection pump and the other end of which communicates with a delivery passage 15.
  • the latter passage is arranged to communicate with each in turn of a plurality of equiangularly spaced delivery ports 16 (only one of which is shown) as the distributor rotates, the delivery ports in use, being connected respectively to the injection nozzles of the associated engine.
  • Within the bore 14 is a movable shuttle 17 and for limiting the movement of the shuttle towards the other end of the bore there is provided a stop 19.
  • an axially extending bore 21 which is in communication at its opposite ends with the adjacent ends of the bore 14.
  • a transverse drilling which communicates with the bore 21 and which as the shuttle moves towards the stop 19 communicates with a plurality of spill passages 20 formed in the distributor.
  • the spill passages 20 register during the time when the plungers 12 are moving inwardly, with spill ports 22 formed in the body part 10 and in communication with the feed conduit 13a.
  • the communication of the end of the bore 21 with the end of the bore 14 which is in communication with the pumping chamber is controlled by a spring loaded valve 23, the operation and purpose of which will be described.
  • each of these series of passages is arranged to communicate during the time when the plungers 12 are permitted to move outwardly by the cam lobes, with two series of feed ports 26, 27 respectively.
  • the feed ports are supplied with fuel from the feed conduit 13a and for controlling the: relative amount of fuel which flows through the feed ports a proportioning valve 30 such as is described and illustrated in the specification of our British Patent No. 956,561 is provided. By this means the amount of fuel delivered by the pump can be controlled.
  • the plungers 12 will commence their inward movement under the action of the cam lobes and fuel will be expelled from the pumping chamber into the bore 14. This fuel will force the shuttle 17 away from the pumping chamber thereby causing fuel to be expelled from the other end of the bore 14 through the delivery passage 15 and to the appropriate injection nozzle of the engine.
  • the opening of the spill ports and spill passages to the other end of the bore 14 besides serving to accurately terminate the end of delivery of fuel to the engine also permits unloading of the pressure in the pipe lines interconnecting the outlet ports 16 and injection nozzles.
  • an unloading valve such as is shown at 31 in FIGURE 1 may be provided in each outlet port or alternatively a single unloading delivery valve may be provided in the bore 14 or in the outlet passage 15.
  • FIGURE 2 a modified form of shuttle is used which is shown in FIGURE 2.
  • the bore 21 in the shuttle is not in communication with the other end of the bore 14 and the valve 23 is arranged so that the pressure at which it opens is greater than the maximum injection pressure encountered whilst the apparatus is in use. In this manner spill from said other end of the bore 14 does not occur but the shuttle moves into contact with the stop 19 thereby terminating the injection of fuel to the engine and subsequently the valve 23 opens to permit surplus fuel within the pumping chamber to escape through the transverse drilling in the shuttle and the spill passages 20.
  • the shuttle is solid and the valve 23 is mounted in an extended portion of the bore 14 on the remote side of the pumping chamber.
  • the valve is loaded so that it only opens when the pressure in the pumping chamber is in excess of the maximum injection pressure which is encountered when the apparatus is in use.
  • the valve 23 may be disposed in the body part and in this case the spill passages 20 are in constant communication with the end of the bore 14 which is connected to the pumping chamber.
  • the valve is positioned within one of the pumping plungers 12 and again the loading of this valve is such that it will not open until the pressure within the pumping chamber exceeds the maximum injection pressure which can be attained during normal use of the apparatus.
  • the shuttle 17 is provided with a stepped axial bore 50 therein and within this bore is the stem 51 of a valve member having a head 52 formed at its end thereof which is directed towards the pumping chamber.
  • the stem is spring loaded by means of a coiled compression spring 53 in a direction so that the head 52 contacts a seating defined on the shuttle. More over, the stem extends beyond the valve member and is adapted to contact the stop 19.
  • the bore in the shuttle is in communication with a transverse drilling 54 which can communicate with the spill passages 20 as will be described.
  • two sets of longitudinal flutes 55 are defined on the stem 51 and these serve to place the transverse drilling 54 in communication with the portion of the bore 14 adjacent the stop as well as to guide the movement of the stem.
  • the fact that the fuel from the end of the bore 14 remote from the pumping chamber is spilled to the spill passage 20 permits relief of the pipe line connecting the outlet port or ports with the injection nozzle or nozzles.
  • the amount of relief can be controlled by any suitable form of valve provided in the pipe line or the outlet port.
  • the right hand set of flutes 55 are omitted and in this case no fuel is spilled from the end of the bore 14 remote from the pumping chamber however, the movement of the shuttle is arrested by the fact that the valve stem contacts the stop 19 and in this manner injection of fuel to the engine ceases and surplus fuel from the pumping chamber is spilled to the spill passages 20.
  • a liquid fuel pumping apparatus for supplying fuel to an internal combustion engine and comprising in combination, an injection pump which is arranged to be driven in timed relationship with an engine with which the apparatus is associated, the injection pump having a pumping chamber which is in communication with one end of a bore, an outlet passage extending from the other end of said bore and through which fuel can flow to the engine during a pumping stroke of the injection pump, a shuttle slidable within said bore, the shuttle being arranged to be moved towards said other end.
  • a liquid fuel pumping apparatus in which a portion of said spill path is defined in the shuttle, said spring loaded valve means also being located in said shuttle.
  • a liquid fuel pumping apparatus in which said spring loaded valve means is a pressure relief valve which is set to withstand the maximum pressure encountered during the delivery of fuel by the apparatus.
  • said spring loaded valve means comprises a seating defined about the portion of the flow path in the shuttle, a valve head loaded into sealing engagement with said seating to prevent the flow of fuel through the flow path, a stem connected to said valve head, the stem forming part of the shuttle and being arranged to lift the valve head from the seating when it contacts said stop.
  • a liquid fuel pumping apparatus in which said portion of the spill path is defined in part by an axial drilling formed in the shuttle, one end of the drilling being in communication with said one end of the bore, a port extending from said bore, said port defining the remaining portion of the spill path, the drilling being brought into communication with said port as the shuttle approaches said stop.
  • a liquid fuel pumping apparatus in which said drilling is open to the other end of the bore, so that as soon as the drilling registers with said port, the delivery of fuel through the outlet passage Will cease, the shuttle continuing its movement until it contacts the stop.
  • a liquid fuel pumping apparatus in which said portion of the spill path is defined in part by an axial drilling formed in the shuttle, one end of the drilling being in communication with said one end of the bore, a port extending from said bore, said port defining the remaining portion of the spill path, the drilling being brought into communication with said port as the shuttle approaches said stop.
  • a liquid fuel pumping apparatus in which said drilling is open to the other end of the bore so that as soon as the drilling registers with the port, the delivery of fuel through the outlet passage will cease, the shuttle continuing its movement until it contacts the stop.
US620962A 1966-03-22 1967-03-06 Liquid fuel pumping apparatus for supplying fuel to internal combustion engines Expired - Lifetime US3427979A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB02494/66A GB1162494A (en) 1966-03-22 1966-03-22 Liquid Fuel Injection Pumping Apparatus for Supplying Fuel to Internal Combustion Engines.

Publications (1)

Publication Number Publication Date
US3427979A true US3427979A (en) 1969-02-18

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ID=10005638

Family Applications (1)

Application Number Title Priority Date Filing Date
US620962A Expired - Lifetime US3427979A (en) 1966-03-22 1967-03-06 Liquid fuel pumping apparatus for supplying fuel to internal combustion engines

Country Status (5)

Country Link
US (1) US3427979A (de)
DE (1) DE1576498B2 (de)
ES (1) ES338857A1 (de)
GB (1) GB1162494A (de)
SE (1) SE315769B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3489092A (en) * 1968-04-22 1970-01-13 Bendix Corp Rotary distributor pump
US3489091A (en) * 1968-04-22 1970-01-13 Bendix Corp Rotary distributor pump
US3494288A (en) * 1968-04-22 1970-02-10 Bendix Corp Rotary distributor pump
US3494289A (en) * 1968-04-22 1970-02-10 Bendix Corp Rotary distributor pump
US3818691A (en) * 1971-12-28 1974-06-25 Surva Seikosha Kk Solar cell for timepiece
US3918853A (en) * 1973-05-25 1975-11-11 Moshe Drori Liquid fuel pumping apparatus
US4325676A (en) * 1979-01-16 1982-04-20 Lucas Industries Limited Liquid fuel pumping apparatus
EP0071800A2 (de) * 1981-08-10 1983-02-16 Hitachi, Ltd. Kraftstoffeinspritzpumpe für Brennkraftmaschine mit verbesserter Auslassvorrichtung für Kraftstoffüberschuss
US4492200A (en) * 1982-05-14 1985-01-08 Hitachi, Ltd. Fuel pumping apparatus
US4528965A (en) * 1984-03-27 1985-07-16 Caterpillar Tractor Co. Rotor balancing for distribution valve

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2130521A (en) * 1932-05-14 1938-09-20 Deckel Friedrich Pump
US3035523A (en) * 1959-12-31 1962-05-22 Cav Ltd Variable delivery pumps
US3058425A (en) * 1960-02-19 1962-10-16 Cav Ltd Liquid fuel pumps for 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
US3263614A (en) * 1963-12-05 1966-08-02 Cav Ltd Liquid fuel pumps
US3331327A (en) * 1965-12-09 1967-07-18 Hartford Machine Screw Co Fuel pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2130521A (en) * 1932-05-14 1938-09-20 Deckel Friedrich Pump
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
US3035523A (en) * 1959-12-31 1962-05-22 Cav Ltd Variable delivery pumps
US3058425A (en) * 1960-02-19 1962-10-16 Cav Ltd Liquid fuel pumps for internal combustion engines
US3263614A (en) * 1963-12-05 1966-08-02 Cav Ltd Liquid fuel pumps
US3331327A (en) * 1965-12-09 1967-07-18 Hartford Machine Screw Co Fuel pump

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3489092A (en) * 1968-04-22 1970-01-13 Bendix Corp Rotary distributor pump
US3489091A (en) * 1968-04-22 1970-01-13 Bendix Corp Rotary distributor pump
US3494288A (en) * 1968-04-22 1970-02-10 Bendix Corp Rotary distributor pump
US3494289A (en) * 1968-04-22 1970-02-10 Bendix Corp Rotary distributor pump
US3818691A (en) * 1971-12-28 1974-06-25 Surva Seikosha Kk Solar cell for timepiece
US3918853A (en) * 1973-05-25 1975-11-11 Moshe Drori Liquid fuel pumping apparatus
US4325676A (en) * 1979-01-16 1982-04-20 Lucas Industries Limited Liquid fuel pumping apparatus
EP0071800A2 (de) * 1981-08-10 1983-02-16 Hitachi, Ltd. Kraftstoffeinspritzpumpe für Brennkraftmaschine mit verbesserter Auslassvorrichtung für Kraftstoffüberschuss
EP0071800A3 (de) * 1981-08-10 1984-01-18 Hitachi, Ltd. Kraftstoffeinspritzpumpe für Brennkraftmaschine mit verbesserter Auslassvorrichtung für Kraftstoffüberschuss
US4492200A (en) * 1982-05-14 1985-01-08 Hitachi, Ltd. Fuel pumping apparatus
US4528965A (en) * 1984-03-27 1985-07-16 Caterpillar Tractor Co. Rotor balancing for distribution valve

Also Published As

Publication number Publication date
DE1576498A1 (de) 1970-02-19
SE315769B (de) 1969-10-06
DE1576498B2 (de) 1976-06-16
ES338857A1 (es) 1968-04-16
GB1162494A (en) 1969-08-27

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