EP0017241A1 - Clapet de retenue de sécurité pour une unité d'injecteur-pompe à combustible - Google Patents

Clapet de retenue de sécurité pour une unité d'injecteur-pompe à combustible Download PDF

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Publication number
EP0017241A1
EP0017241A1 EP80101813A EP80101813A EP0017241A1 EP 0017241 A1 EP0017241 A1 EP 0017241A1 EP 80101813 A EP80101813 A EP 80101813A EP 80101813 A EP80101813 A EP 80101813A EP 0017241 A1 EP0017241 A1 EP 0017241A1
Authority
EP
European Patent Office
Prior art keywords
fuel
valve
pressure
seat
injector
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.)
Withdrawn
Application number
EP80101813A
Other languages
German (de)
English (en)
Inventor
Marion Raymond Joy
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Publication of EP0017241A1 publication Critical patent/EP0017241A1/fr
Withdrawn legal-status Critical Current

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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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps

Definitions

  • This invention relates to a fuel injection apparatus and particularly to unit type fuel pump- injectors for diesel and other engines.
  • One device for accomplishing this result is a unit fuel'pump-injector which performs the dual functions of injecting fuel into the engine combustion space and metering the amount of fuel to be injected.
  • the fuel injector housing contains a cylindrical bore in which a plunger is reciprocable. Clamped to the lower end of the housing is a spacer block which defines a pump cylinder for the plunger. This spacer block contains an annular groove connected to a plurality of passageways which lead to a fuel chamber surrounding a needle valve located in the tip of the fuel injector.
  • the upper surface of the spacer block defining the plunger cylinder(chamber) usually includes a check valve in the form of a circular flat disc which prevents combustion gases from entering the plunger cylinder if the needle valve fails to close or-closes too slowly.
  • the check valve will thus provide the dual functions of limiting both combustion gas from entering the plunger chamber and low pressure fuel from escaping from the plunger cylinder to the combustion space in the event that the injector tip is damaged or the needle valve malfunctions.
  • FIG. 1 An exemplary embodiment of a unit fuel pump-injector is illustrated in Fig. 1 and comprises a housing 10 in which a plunger 12 is reciprocable. The lower end of the housing 10 supports a bushing 14 which forms a cylinder 22 for the plunger 12. An annular space 16 surrounding the bushing 14 is supplied with low pressure fuel by a fuel pump 18 (shown schematically) via a fuel inlet port 20. This low pressure fuel is subsequently delivered to the plunger cylinder 22 by two bushing ports 24, 26. Any excess fuel delivered to the injector by the fuel pump 18 is returned to a fuel system tank 28 (shown schematically) by an exit port 30.
  • a fuel pump 18 shown schematically
  • the plunger 12 has the usual by-pass means including an external groove 32 or so-called “scroll", by which opening and closing of the ports 24, 26 in the bushing 14 is controlled, and connecting axial and transverse passages 34, 36 for by-passing fuel from the plunger cylinder 22 to the annular fuel space 16 when the groove 32 is in registry with one or the other of the ports 24,26.
  • the spacer block 44 has an annular cavity 46 facing the lower opening 38 . of bushing 14, and projecting centrally upward from the bottom of the cavity 46 is a protuberance 48 which forms a stop for a circular flat disc check valve 50.
  • the protuberance 48 includes a circular recess 52 containing a spring 54 for resiliently urging the check valve 50 toward the opening 38 in the bushing 14.
  • the check valve 50 has a greater diameter than the cylinder 22 so as to seal about the opening 38 when urged thereagainst by the spring 54.
  • the cavity 46 is connected to an annular groove 56 located in the lower face of the spring retainer 42 by a plurality of passageways 58,60.
  • a plurality of inclined passages 62 connect the annular groove 56 and a fuel chamber 64 which surrounds a needle valve 66 located in the spray tip 40.
  • At the lower end of the fuel chamber 64 is an outlet for fuel delivery in the form of a tapered seat 68 for the needle valve 66, below which seat 68 are located a plurality of spray orifices 70.
  • the upper end of the spray tip 40 is provided with a bore 72 for guiding opening and closing movements of the needle valve 66.
  • a piston portion 74 of the needle valve 66 slidably fits this bore 72, and has its lower end exposed to fuel pressure in the fuel chamber 64.
  • a reduced portion 75 of the needle valve 66 upper end extends through an opening 76 and the lower portion of the spring chamber 42'and abuts a spring seat 78.
  • Compressed between this spring seat 78 and lower surface of the spacer block 44 is a coil compression spring 80 which biases the needle valve 66 to its closed position as shown.
  • low pressure fuel is supplied by the fuel pump 18 to the intake port 20, the annular space 16, the bushing ports 24,26 and the plunger chamber(cylinder) 22.
  • This fuel is at a relatively low pressure (approximately 80 psi) and is retained in the plunger chamber by the check valve 50 and the check valve spring 54 which is suitably selected to insure such retention.
  • the plunger 12 When it is desired to inject fuel into the combustion space, the plunger 12 begins a downward or injection stroke which directs fuel at a much higher pressure against the check valve 50 which opens against the bias of the spring 54. Fuel flows past the check valve 50, through the passages 60, 58, 62 and to the fuel chamber 64. This fuel then acts upon the piston portion 74 of the needle valve 66 and raises the needle valve 66 away from the valve seat 68. T. l e spray tip orifices 70 are then placed in fluid communication with the fuel chamber 64 and fuel is injected into the engine combustion space (not shown).
  • the unique construction of the check valve/check valve spring unit 50, 54 limits any undesired flow of fuel to the injector tip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP80101813A 1979-04-09 1980-04-03 Clapet de retenue de sécurité pour une unité d'injecteur-pompe à combustible Withdrawn EP0017241A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOPCT/US79/00215 1979-04-09
PCT/US1979/000215 WO1980002180A1 (fr) 1979-04-09 1979-04-09 Clapet de securite pour un dispositif d'injecteur-pompe de combustible

Publications (1)

Publication Number Publication Date
EP0017241A1 true EP0017241A1 (fr) 1980-10-15

Family

ID=22147553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101813A Withdrawn EP0017241A1 (fr) 1979-04-09 1980-04-03 Clapet de retenue de sécurité pour une unité d'injecteur-pompe à combustible

Country Status (2)

Country Link
EP (1) EP0017241A1 (fr)
WO (1) WO1980002180A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3331336A1 (de) * 1983-08-31 1985-03-14 L'Orange GmbH, 7000 Stuttgart Kraftstoffeinspritzvorrichtung
DE8404020U1 (de) * 1984-02-10 1985-06-13 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe für Brennkraftmaschinen
GB2318838B (en) * 1993-12-10 1998-07-15 White Consolidated Ind Inc Viscous material dispenser and method for dispensing
EP2586471B1 (fr) 2008-02-14 2019-04-24 KCI Licensing, Inc. Dispositifs et procédés de traitement de tissu endommagé
BE1028663B1 (nl) 2020-10-01 2022-05-02 Avc Gemino Bvba Verbindingssysteem voor de opbouw van een binnenwand

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB541100A (en) * 1940-05-11 1941-11-12 Cav Ltd Improvements relating to fuel injection means for internal combustion engines
GB714610A (en) * 1950-12-08 1954-09-01 Daimler Benz Ag Improvements relating to fuel-injection arrangements for internal combustion engines
US2762654A (en) * 1952-07-01 1956-09-11 Gen Motors Corp Fuel injection device
US3006556A (en) * 1961-01-03 1961-10-31 Gen Motors Corp Unit fuel pump-injector
US3177857A (en) * 1963-03-02 1965-04-13 Motomak G M B H Self-adjusting hydraulic valve lifter for piston engines
US3257078A (en) * 1964-10-14 1966-06-21 Gen Motors Corp Fuel injector with hydraulically controlled injection valve
US4054248A (en) * 1976-07-01 1977-10-18 General Motors Corporation Fuel injector pump for a unit fuel injector
FR2366460A1 (fr) * 1976-10-04 1978-04-28 Friedmann & Maier Ag Dispositif d'injection de carburant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2144862A (en) * 1937-04-03 1939-01-24 Gen Motors Corp Fuel pump injector
US2280386A (en) * 1941-04-09 1942-04-21 Gen Motors Corp Combined engine cylinder valve and fuel injector

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB541100A (en) * 1940-05-11 1941-11-12 Cav Ltd Improvements relating to fuel injection means for internal combustion engines
GB714610A (en) * 1950-12-08 1954-09-01 Daimler Benz Ag Improvements relating to fuel-injection arrangements for internal combustion engines
US2762654A (en) * 1952-07-01 1956-09-11 Gen Motors Corp Fuel injection device
US3006556A (en) * 1961-01-03 1961-10-31 Gen Motors Corp Unit fuel pump-injector
US3177857A (en) * 1963-03-02 1965-04-13 Motomak G M B H Self-adjusting hydraulic valve lifter for piston engines
US3257078A (en) * 1964-10-14 1966-06-21 Gen Motors Corp Fuel injector with hydraulically controlled injection valve
US4054248A (en) * 1976-07-01 1977-10-18 General Motors Corporation Fuel injector pump for a unit fuel injector
FR2366460A1 (fr) * 1976-10-04 1978-04-28 Friedmann & Maier Ag Dispositif d'injection de carburant

Also Published As

Publication number Publication date
WO1980002180A1 (fr) 1980-10-16

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Inventor name: JOY, MARION RAYMOND