US3695784A - Fuel injection pump construction - Google Patents

Fuel injection pump construction Download PDF

Info

Publication number
US3695784A
US3695784A US41874A US3695784DA US3695784A US 3695784 A US3695784 A US 3695784A US 41874 A US41874 A US 41874A US 3695784D A US3695784D A US 3695784DA US 3695784 A US3695784 A US 3695784A
Authority
US
United States
Prior art keywords
delivery
valve
passage
chamber
plunger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US41874A
Other languages
English (en)
Inventor
Mataji Tateishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Application granted granted Critical
Publication of US3695784A publication Critical patent/US3695784A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1317—Fuel pumpo for internal combustion engines

Definitions

  • a fuel injection pump includes a fuel pump plunger Appl 41874 which is movable to direct the fuel under pressure through a passage which is regulated by a delivery [30] Foreign Application Priority Data valve.
  • the delivery valve includes a collar portion June 9, 1969 Japan ..44/44670 which the movement the delivery valve, causes a sucking back or unloading action on 52 U.S. c1. ..417/296, 417/458, 417/501 the fuel in a direction toward the P p plunger 51 Int. Cl.
  • the invention provides means for varying [58] Field of Search ..4l7/293, 296, 456, 458, 501, the fuel flow area in the return direction of movement 417/569, 571; 123/139 PP of the delivery valve in accordance with the lift of the delivery valve during its operative opening movement. [56] References Cited In one arrangement the delivery valve is constructed UNITED STATES PATENTS to close one or more escape ports during its downward return movement for slowing the return flow of the 2,918,048 12/1959 Aldinger et al.
  • the delivery valve includes an end portion which NlChOlS provides a variable action on a port commu- 2,922,581 l/l960 Gardy ..4l7/569 nicating with the delivery valve passage a the pump 1,974,851 9/1934 Hurst ..4l7/296 plunger chamben 2,612,841 10/1952 Lasley ..123/139 OP 3,195,465 7/ 1965 Hug ..4l7/296 4 Claims, 6 Drawing Figures PATENTED BE 3 I973 SECOND h EMBODIMENT (Has) SN FIRST EMBODIMENT (FIG 2) PRIOR ART (FIGJ) TYPE .I (FIGJ) hss- V xodm xuDm mm jmo I In 2.
  • This invention relates in general to the construction of fuel injection pumps and in particular, to a new and useful arrangement of fuel injection pump wherein the pump is discharged through a delivery passage which is controlled by a delivery valve and which includes means for regulating the backward movement of the delivery valve, after delivery of the fuel, in accordance with the amount of movement of the valve in the pumping stroke.
  • the presentinvention is particularly concerned with the prevention of the generation of a secondary injection in a fuel injection system during the operation of a fuel injection pump.
  • the delivery valves which are opened against spring pressure during the pumping stroke of the plunger move in a return direction through a delivery valve passage and tend to cause a sucking back of the fuel through this passage.
  • a collar formation (or piston) on the valve causes the pressure in the delivery valve chamber to reduce positively so that when the pressure wave which is returned from the nozzle or fuel injection valve side of the fuel injection system is reflected back at the pumping chamber it is propagated to the nozzle or the fuel injection valve side with a reduced pressure.
  • a disadvantage of the constructions of such pump is that:
  • the suck-back period cannot be controlled and generally it is a short period.
  • a fuel injection pump which does not have the disadvantages of the prior art and which includes a delivery valve which moves backwardly during a return stroke and which is constructed and arranged in such a manner that the flow area of the fuel moving ahead of it on the return movement may be varied in accordance with the amount of lift of the valve during the fuel delivery portion of the stroke.
  • the construction includes means for providing an escape path between the delivery valve chamber and the plunger chamber. In one embodiment this comprises an arrangement of the valve to close one or more escape ports for the fuel which lead to the plunger chamber from the delivery chamber. The member of ports closed and their rate of closing will depend upon the amount of lift of the valve during its upward fuel delivery movement.
  • valve is provided with means for varying the flow area between the delivery valve passage and the plunger chamber during its return movement and independence upon the amount of upward lift movement.
  • an object of the invention to provide an improved fuel injection pump which includes a delivery valve arranged in a delivery valve passage between the pump plunger chamber and the fuel delivery line and with means associated with the valve for regulating the back flow area from the delivery valve chamber to the pump plunger chamber in accordance with the amount of lift of the valve.
  • a further object of the invention is to provide a fuel injection device which includes a delivery valve passage extending from a plunger passage chamber and which includes a delivery valve member therein having a collar formation (or piston) at its delivery end and which includes a body movable in the delivery valve chamber in an opening direction against biasing means such as a spring and in a closing direction to successive ly close one or more escape ports for the fuel which provide a connection for by-passing the fuel backwardly into the plunger chamber.
  • biasing means such as a spring
  • a further object of the invention is to provide a fuel injection device which includes a delivery valve having an end portion which engages with a constricted passage portion of the delivery valve passage during the return movement of the valve for regulating the flow from the passage to the plunger chamber of the injection device in accordance with the amount of lift of the valve.
  • a further object of the invention is to provide a fuel injection pump which is simple in design, rugged in construction, and economical to manufacture.
  • FIG. 1 is a partial sectional view of a portion of a fuel injection pump constructed in accordance with the prior art
  • FIG. 2 is a view similar to FIG. 1 but of a construction of a first embodiment of the present invention
  • FIG. 3 is a view similar to FIG. 2 of another embodiment of the invention.
  • FIG. 4 is an enlarged view of a portion of the apparatus indicated in FIG. 3;
  • FIG. 5 is a diagram showing the relation between the cross sectional area of the escape ports and the delivery valve lift.
  • FIG. 6 is a diagram showing the relationship of the suck-back (or unloading) velocity and the delivery valve lift in respect to time after the termination of pump delivery.
  • a fuel injection pump generally designated 50 of the construction of the prior art includes a plunger barrel 1 defining a plunger chamber 23 in which is movable a plunger barrel or pump plunger 2.
  • An oil feed and exhaust conduit 3 is defined in the barrel 1 and communicates during the operation of the plunger through a plunger notch portion 21 with the chamber 23.
  • the plunger chamber 23 communicates with a delivery chamber 52 formed in a guide member 4 over the plunger barrel 1.
  • a delivery valve 5 is movable within the passage 52 and it is biased by a spring 8 in a closing direction toward the plunger chamber 23.
  • a delivery chamber 22 is in communication with the delivery passage 52 during the upward movement of the plunger 2 and the delivery valve 5.
  • the delivery valve 5 includes a collar portion 6 adjacent its delivery end and a guide rod portion 7 which rides in the passage 52.
  • the invention embodied therein in FIG. 2 comprises a first embodiment of fuel pump generally designated 50' which includes a plunger barrel 1 defining a plunger chamber 23' in which a plunger 2' is movable.
  • a delivery valve 5 is biased by a spring 8' in a direction toward the chamber 23 and it is movable in a delivery passage or chamber 52.
  • means are associated with the delivery valve 5' for regulating the return flow of the fuel from the delivery passage 52 to the plunger chamber 23.
  • this comprises a check valve seat member 9 which is interposed between the guide member 4' and the plunger barrel 1.
  • a check valve member 10 is arranged to close a passage 24 from the delivery chamber 52 to the pump chamber 23'.
  • a spring 13 is arranged to bias the valve member 10 into a closing position.
  • a plurality of escape ports 11 are defined along the chamber 52' and these communicate with annular passages 12 which form a by-pass for the fuel from the chamber 52 back to the pump chamber 23'.
  • the escape ports 11 are advantageously bored in multiple stages and they have different diameters and they are arranged at vertically spaced locations along the height of the delivery chamber 52'.
  • the delivery valve 5' moves backwardly so that the collar 6' produces a suction effect on the fuel in the delivery chamber 22' to cause it to flow in the direction of the arrows through one or more ports 5a into the center 5b of the delivery valve rod portion or stem 7' and into the chamber 52 ahead of the valve 5'.
  • the passage 24 is closed by the check valve 10 during this reversal movement of the delivery valve 5' therefore the oil passage through the escape (or by-pass) ports 11 and the annular passages 12 into the plunger chamber 23 simultaneously with the counterflow of the fuel the delivery valve 5' is lowered and when the collar portion 6' is engaged with the guide portion or delivery chamber 52' the flow of the oil from the delivery valve chamber 22 to the plunger chamber 23 stops. This results in an expansion of the oil in the delivery valve chamber corresponding to the amount of descent of the delivery valve 5'.
  • the number of ports 11 which are opened depends on the amount of upward movement of the valve 5 the greatest number of ports 11 are open and in a lower position, the least number of ports or no ports are opened. This reducing of the number of escape ports enhances the choke effect on the movement of the valve and thereby the descending velocity of the delivery valve is limited.
  • the inventive construction is compared with the prior art.
  • the suck-back velocity is expected to become greater, the greater the time which has elapsed, as shown in the curved Vso.
  • it is limited up to a certain suck-back velocity as shown by the curved V and also the suck-back period can be prolonged.
  • curves h and V represent the lift of the delivery valve and the suck back velocity respectively. These curves are applicable in the case where only one escape port is employed where the sucked back period can be prolonged but the suck-back velocity cannot be controlled with respect to the lift of the delivery valve or the time after termination of the pump delivery.
  • a fuel injection pump generally designated 50" which includes parts which are similarly designated to those of FIGS. 2 but with a double prime.
  • the principle of operation is the same as that of the first embodiment shown in FIG. 2, but the flow area is varied by means of a conical extension 25 formed on the rod portion 7" of the delivery valve 5".
  • an intermediate member 26 is provided between the delivery valve member 4" and the barrel 1" and this member defines a passageway 27 which defines a variable flow area from the delivery valve chamber 52' to the plunger chamber or pump chamber 23".
  • the pointed valve member 25 is movable with the delivery valve 5" between the solid line position shown in the drawings to the dotted line position at which the passage 27 is throttled down to its lowest flow area.
  • the movement and operation of the delivery valve 5" is the same as that of the embodiment of FIG. 2, and during the return movement the member 25 is moved from the solid line position at which the passage 27 is fully opened to the dotted line position at which it is substantially closed.
  • FIG. 4 the various end positions and single intermediate position of the member 25 are indicated with greater detail.
  • the maximum flow area is indicated by A, and this corresponds to the maximum height h max. of the delivery valve 5.
  • the minimum position of the delivery valve h min. may be the intermediate dotted line position indicated if desired or a lower position.
  • a fuel injection pump comprising a body defining a plunger chamber with a discharge end, a valve delivery passage having one end connected into the discharge end of said plunger chamber and having an opposite delivery chamber end, said body defining a delivery chamber connected to said delivery chamber end of said delivery passage, a delivery valve having a stem portion movable in said delivery passage and a valve head portion with an intermediate collar of substantially the same diameter as the diameter of said delivery passage and being movable toward and away from the delivery chamber end of the passage, plunger movable in said plunger chamber to move fluid therein through said valve delivery passage and into said delivery chamber and to move said valve portion away from the delivery chamber end of said passage, said valve head portion and said collar being movable with said stem portion in an opposite return direction toward said plunger chamber, flow control means associated with said delivery valve for controlling the descending velocity of said delivery valve and for varying the flow area from said valve delivery passage to said plunger chamber end ahead of said valve stem portion in the return movement thereof in accordance with the lift of said delivery valve during the operational stroke of
  • said means for varying the flow area from said valve delivery passage to said plunger chamber comprises a plurality of separate escape passages extending from said plunger chamber to said delivery passage, each of said escape passages terminating in a separate port in said delivery passage, said ports being spaced vertically along said delivery passage and being coverable by said valve stem portion during its return movement toward said plunger chamber.
  • a fuel injection pump according to claim 2, wherein said ports are of different sizes.
  • a fuel injection pump according to claim 2, wherein said ports and said passages define different flow areas, said port having the greatest flow area being located uppermost in said valve delivery passage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US41874A 1969-06-09 1970-06-01 Fuel injection pump construction Expired - Lifetime US3695784A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4467069 1969-06-09

Publications (1)

Publication Number Publication Date
US3695784A true US3695784A (en) 1972-10-03

Family

ID=12697868

Family Applications (1)

Application Number Title Priority Date Filing Date
US41874A Expired - Lifetime US3695784A (en) 1969-06-09 1970-06-01 Fuel injection pump construction

Country Status (5)

Country Link
US (1) US3695784A (da)
CH (1) CH503897A (da)
DE (1) DE2028321C2 (da)
DK (1) DK132464C (da)
GB (1) GB1317913A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT408135B (de) * 1994-04-28 2001-09-25 Steyr Nutzfahrzeuge Kraftstoffeinspritzung in brennkraftmaschinen
US11220980B2 (en) * 2019-05-16 2022-01-11 Caterpillar Inc. Fuel system having isolation valves between fuel injectors and common drain conduit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3112100A1 (de) * 1981-03-27 1982-10-07 Robert Bosch Gmbh, 7000 Stuttgart "druckventil fuer eine brennstoffeinspritzpumpe"

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1974851A (en) * 1929-11-23 1934-09-25 Bosch Robert Governor for internal combustion engines
FR850316A (fr) * 1938-02-15 1939-12-14 Karl Lieberknecht Bas tricoté à éléments de talon formés après coup et procédé pour sa confection
US2612841A (en) * 1948-09-29 1952-10-07 Louis G Simmons Variable retraction discharge valve for fuel injection pumps
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment
US2918048A (en) * 1953-06-03 1959-12-22 Bosch Gmbh Robert Control valve arrangement for injection pumps
US2922581A (en) * 1954-06-14 1960-01-26 Bendix Aviat Corp Fuel injection apparatus
US2953992A (en) * 1953-05-11 1960-09-27 Daimler Benz Ag Discharge valve assembly for fuel injection pumps
US3195465A (en) * 1962-08-09 1965-07-20 Schweizerische Lokomotiv Fuel injection pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1050441A (fr) * 1950-11-17 1954-01-07 British Internal Combust Eng Perfectionnements aux dispositifs d'injection de combustible liquide
AT190733B (de) * 1953-05-11 1957-07-25 Daimler Benz Ag Auslaßdruckventil für Einspritzpumpen von Einspritzbrennkraftmaschinen
NL125952C (da) * 1964-04-21
FR1529222A (fr) * 1967-06-27 1968-06-14 Daimler Benz Ag Dispositif pour l'injection de carburant dans un moteur à combustion interne

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1974851A (en) * 1929-11-23 1934-09-25 Bosch Robert Governor for internal combustion engines
FR850316A (fr) * 1938-02-15 1939-12-14 Karl Lieberknecht Bas tricoté à éléments de talon formés après coup et procédé pour sa confection
US2612841A (en) * 1948-09-29 1952-10-07 Louis G Simmons Variable retraction discharge valve for fuel injection pumps
US2953992A (en) * 1953-05-11 1960-09-27 Daimler Benz Ag Discharge valve assembly for fuel injection pumps
US2918048A (en) * 1953-06-03 1959-12-22 Bosch Gmbh Robert Control valve arrangement for injection pumps
US2922581A (en) * 1954-06-14 1960-01-26 Bendix Aviat Corp Fuel injection apparatus
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment
US3195465A (en) * 1962-08-09 1965-07-20 Schweizerische Lokomotiv Fuel injection pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT408135B (de) * 1994-04-28 2001-09-25 Steyr Nutzfahrzeuge Kraftstoffeinspritzung in brennkraftmaschinen
US11220980B2 (en) * 2019-05-16 2022-01-11 Caterpillar Inc. Fuel system having isolation valves between fuel injectors and common drain conduit

Also Published As

Publication number Publication date
GB1317913A (en) 1973-05-23
DK132464B (da) 1975-12-08
DE2028321C2 (de) 1983-10-27
DK132464C (da) 1976-06-14
CH503897A (de) 1971-02-28
DE2028321A1 (de) 1970-12-17

Similar Documents

Publication Publication Date Title
JP4040092B2 (ja) 内燃機関において使用される燃料噴射機構用の燃料高圧発生装置
US3115304A (en) Fuel injector pump with hydraulically controlled injection valve
US4099894A (en) Fuel injection for diesel engines having controlled-rate pressure relief means
GB1347260A (en) Delivery valves
US4314797A (en) Metering piston pump
JP3574681B2 (ja) 内燃機関の燃料噴射装置
US3625192A (en) Fuel injection nozzle with hydraulic valve-closing means
KR100377894B1 (ko) 연료분사장치
GB1347488A (en) Liquid fuel injection pumping apparatus for an 'internal combustion engine
US2215469A (en) Fuel delivery pump system for injection internal combustion engines
US3773440A (en) Fuel injection pump construction
US2384011A (en) Fuel injection apparatus
US3695784A (en) Fuel injection pump construction
US4405082A (en) Low leakage fuel injector
EP4310336A1 (en) Jet pump
US3552889A (en) Liquid fuel injection pumps
US2496804A (en) Fuel injection device
US2833218A (en) Liquid fuel injection pumps for internal combustion engines
US3011489A (en) Reciprocating action pumps for the injection of fuel into internal combustion engines
US2287702A (en) Fuel injection device
US2946287A (en) Self-regulating piston pumps, in particular fuel injection pumps for internal combustion engines
US2953992A (en) Discharge valve assembly for fuel injection pumps
US1958948A (en) Fuel pump
GB1487178A (en) Fuel injection pumping apparatus
US3016835A (en) Self-regulating reciprocating action pumps