EP0466081A1 - Soupape de sécurité pour dispositif d'injection de combustible - Google Patents

Soupape de sécurité pour dispositif d'injection de combustible Download PDF

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Publication number
EP0466081A1
EP0466081A1 EP91111358A EP91111358A EP0466081A1 EP 0466081 A1 EP0466081 A1 EP 0466081A1 EP 91111358 A EP91111358 A EP 91111358A EP 91111358 A EP91111358 A EP 91111358A EP 0466081 A1 EP0466081 A1 EP 0466081A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel
pressure
valve element
accumulator
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Withdrawn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
EP91111358A
Other languages
German (de)
English (en)
Inventor
Yasuhiro Kariya
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.)
Denso Corp
Original Assignee
NipponDenso Co 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 NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Publication of EP0466081A1 publication Critical patent/EP0466081A1/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Withdrawn legal-status Critical Current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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0056—Throttling valves, e.g. having variable opening positions throttling the flow

Definitions

  • the present invention relates to a safety valve of an accumulator in a fuel injection apparatus of a diesel engine for injecting high-pressure fuel accumulated in the accumulator by means of an injector of an electronic control type provided in each cylinder.
  • This fuel injection apparatus is provided with a safety valve which is opened for releasing the fuel when a pressure in the accumulator exceeds a predetermined value.
  • the structure of the conventional safety valve is such that a tapered seat face 32 which is an opening portion of a passage 31 in communication with the accumulator is opened/closed by a ball valve 37, and that when the fuel pressure in the accumulator exceeds a biasing force of a spring 38 which presses and biases the ball valve 37 in a valve-closing direction, the ball valve 37 is opened to release the fuel of the accumulator to the low pressure side, thereby suppressing an increase of pressure in the accumulator.
  • the present invention is intended to provide a safety valve of a fuel injection apparatus which can obtain a property of a large flow rate after the valve is opened and which can constantly maintain the pressure in an accumulator to be not higher than a critical pressure.
  • Another object of the invention is to provide a safety valve which enables the fuel pressure in the accumulator to recover a predetermined value instantaneously by opening the valve rapidly once it reaches a valve-opening pressure.
  • fuel supplied from a fuel tank (not shown) is pressurized and delivered through a conduit via a delivery valve by means of a high-pressure supply pump 2 such as a priming pump, and accumulated in an accumulation chamber of an accumulator 1 which is called a common rail.
  • a high-pressure supply pump 2 such as a priming pump
  • the high-pressure fuel accumulated in the accumulation chamber of the accumulator 1 is injected into an internal combustion engine through an opened nozzle hole when a nozzle needle having a distal-end portion to open/close the nozzle hole is biased in a valve-opening direction by a pressure of the fuel supplied through a check valve and a passage in an injector of an electronic control type (not shown) provided in each cylinder.
  • a safety valve 3 for controlling the fuel pressure in the accumulator 1 so as to prevent it from exceeding a critical value.
  • the safety valve 3 comprises: a housing 30 which includes an inside passage 31 in communication with the accumulator 1, a tapered seat face 32 formed at an opening portion of the inside passage 31, a small-diameter section 33, a spring chamber 34 and a low-pressure passage 35 in communication with a fuel tank 4 on the low pressure side of the safety valve; a valve element 36 provided movably within the housing 30, with a ball valve 37 to open/close the seat face 32 being fixed on this valve element; and a spring 38 which presses and biases the valve element 36 in a valve-closing direction.
  • valve element 36 is closely fitted in the small-diameter section 33 of the housing 30, and a fuel chamber 39 which maintains a pressure for pressing the valve element 36 in the valve-opening direction is defined between the valve element 36 and the end surface of the small-diameter section 33.
  • the safety valve 3 of the above-described structure is operated in the following manner.
  • the ball valve 37 When the fuel pressure in the accumulator 1 is not higher than a valve-opening pressure of the ball valve 37 which is predetermined by the spring 38, the ball valve 37 is contacted with the seat face 32. With the ball valve 37 in this state, when the fuel pressure in the accumulator 1 is increased, the fuel introduced from the inside passage 31 causes the ball valve 37 to be opened against a biasing force of the spring 38. Consequently, the fuel introduced from the inside passage 31 flows into the fuel chamber 39 and presses the valve element 36 in the valve-opening direction. As a result, the valve element 36 is rapidly opened to allow the fuel introduced from the inside passage 31 to flow to the low pressure side of the safety valve at once so that the accumulator 1 will recover a predetermined pressure in an instant.
  • Fig. 4 illustrates a change of the fuel pressure in the accumulator 1 from the opening to the closing of the safety valve.
  • the pressure P R can be set to a predetermined value by regulating a clearance a between the valve element 36 and the small-diameter section 33, and when the pressure P R is set to a minimum value which the pressure in the accumulator 1 is required to have for operating the engine, the fail-safe and limp-home system can be functioned favorably at the time of a trouble.
  • the high-pressure fuel introduced from the inside passage flows into the fuel chamber, and the pressure in this fuel chamber presses the valve element in the valve-opening direction so that the valve element will be rapidly opened, with the result that the fuel pressure in the accumulator can recover a predetermined value instantaneously.
  • a safety valve provided in a fuel injection apparatus including an accumulator in which fuel is accumulated comprises: a housing having an inside passage for introducing the high-pressure fuel of the accumulator into the inside of the housing and a seat face formed at a portion of the inside passage; a valve element provided movably within the housing and including a valve body to open/close the seat face; an elastic member for pressing and biasing the valve element in a closing direction; and a fuel chamber defined between the inner surface of the housing and the valve element so as to maintain a pressure for pressing the valve element in a valve-opening direction, wherein the high-pressure fuel from the inside passage is introduced into the fuel chamber when the valve body of the valve element is separated from the seat face.
  • the high-pressure fuel of the accumulator is introduced into the fuel chamber in order to press the valve element in the valve-opening direction so that the valve element will be rapidly opened, with the result that the fuel pressure in the accumulator can recover a predetermined value instantaneously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Check Valves (AREA)
EP91111358A 1990-07-09 1991-07-08 Soupape de sécurité pour dispositif d'injection de combustible Withdrawn EP0466081A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18241090A JPH0472454A (ja) 1990-07-09 1990-07-09 燃料噴射装置の安全弁
JP182410/90 1990-07-09

Publications (1)

Publication Number Publication Date
EP0466081A1 true EP0466081A1 (fr) 1992-01-15

Family

ID=16117811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111358A Withdrawn EP0466081A1 (fr) 1990-07-09 1991-07-08 Soupape de sécurité pour dispositif d'injection de combustible

Country Status (2)

Country Link
EP (1) EP0466081A1 (fr)
JP (1) JPH0472454A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999060266A1 (fr) * 1998-05-20 1999-11-25 Robert Bosch Gmbh Soupape de limitation de pression
CN103148029A (zh) * 2013-03-28 2013-06-12 长城汽车股份有限公司 变速器及其蓄能器组件
WO2013093179A1 (fr) * 2011-12-22 2013-06-27 Wärtsilä Finland Oy Structure de soupape de sûreté pour système d'injection de carburant à rampe commune et système d'injection de carburant à rampe commune
WO2013171028A1 (fr) * 2012-05-16 2013-11-21 Voss Automotive Gmbh Soupape de limitation de pression
CN111648895A (zh) * 2019-03-04 2020-09-11 株式会社电装 压力控制装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008175085A (ja) * 2007-01-16 2008-07-31 Denso Corp 燃料噴射装置のプレッシャリミッタ
WO2018003435A1 (fr) * 2016-06-29 2018-01-04 日立オートモティブシステムズ株式会社 Pompe d'alimentation en carburant haute pression

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB925590A (en) * 1958-05-22 1963-05-08 Mastabar Mining Equip Co Ltd Improvements in or relating to fluid pressure relief valves
US3373764A (en) * 1966-02-17 1968-03-19 Specialties Dev Corp High flow relief valves
FR2341087A1 (fr) * 1976-02-10 1977-09-09 Bendiberica Sa Valve de limitation de pression
US4217862A (en) * 1977-03-28 1980-08-19 Combustion Research & Technology, Inc. High constant pressure, electronically controlled diesel fuel injection system
EP0145436A2 (fr) * 1983-12-09 1985-06-19 LUCAS INDUSTRIES public limited company Vanne de limitation de pression
FR2609503A1 (fr) * 1987-01-12 1988-07-15 Iveco Fiat Installation d'injection du carburant a accumulation de pression
EP0299337A2 (fr) * 1987-07-08 1989-01-18 IVECO FIAT S.p.A. Système d'injection de carburant pour un moteur à combustion interne

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB925590A (en) * 1958-05-22 1963-05-08 Mastabar Mining Equip Co Ltd Improvements in or relating to fluid pressure relief valves
US3373764A (en) * 1966-02-17 1968-03-19 Specialties Dev Corp High flow relief valves
FR2341087A1 (fr) * 1976-02-10 1977-09-09 Bendiberica Sa Valve de limitation de pression
US4217862A (en) * 1977-03-28 1980-08-19 Combustion Research & Technology, Inc. High constant pressure, electronically controlled diesel fuel injection system
EP0145436A2 (fr) * 1983-12-09 1985-06-19 LUCAS INDUSTRIES public limited company Vanne de limitation de pression
FR2609503A1 (fr) * 1987-01-12 1988-07-15 Iveco Fiat Installation d'injection du carburant a accumulation de pression
EP0299337A2 (fr) * 1987-07-08 1989-01-18 IVECO FIAT S.p.A. Système d'injection de carburant pour un moteur à combustion interne

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999060266A1 (fr) * 1998-05-20 1999-11-25 Robert Bosch Gmbh Soupape de limitation de pression
WO2013093179A1 (fr) * 2011-12-22 2013-06-27 Wärtsilä Finland Oy Structure de soupape de sûreté pour système d'injection de carburant à rampe commune et système d'injection de carburant à rampe commune
WO2013171028A1 (fr) * 2012-05-16 2013-11-21 Voss Automotive Gmbh Soupape de limitation de pression
US9062644B2 (en) 2012-05-16 2015-06-23 Voss Automotive Gmbh Pressure-limiting valve
CN104302907B (zh) * 2012-05-16 2017-03-01 福士汽车配套部件责任有限公司 限压阀
CN103148029A (zh) * 2013-03-28 2013-06-12 长城汽车股份有限公司 变速器及其蓄能器组件
CN103148029B (zh) * 2013-03-28 2015-07-01 长城汽车股份有限公司 变速器及其蓄能器组件
CN111648895A (zh) * 2019-03-04 2020-09-11 株式会社电装 压力控制装置

Also Published As

Publication number Publication date
JPH0472454A (ja) 1992-03-06

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