FR2251725A1 - Fuel injection pump for I.C. engine - has two pressure relief valves with differing characteristics - Google Patents

Fuel injection pump for I.C. engine - has two pressure relief valves with differing characteristics

Info

Publication number
FR2251725A1
FR2251725A1 FR7438098A FR7438098A FR2251725A1 FR 2251725 A1 FR2251725 A1 FR 2251725A1 FR 7438098 A FR7438098 A FR 7438098A FR 7438098 A FR7438098 A FR 7438098A FR 2251725 A1 FR2251725 A1 FR 2251725A1
Authority
FR
France
Prior art keywords
pump
valve
engine
fuel injection
pressure relief
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.)
Granted
Application number
FR7438098A
Other languages
French (fr)
Other versions
FR2251725B1 (en
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.)
CAV Ltd
Original Assignee
CAV 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 CAV Ltd filed Critical CAV Ltd
Publication of FR2251725A1 publication Critical patent/FR2251725A1/en
Application granted granted Critical
Publication of FR2251725B1 publication Critical patent/FR2251725B1/fr
Granted legal-status Critical Current

Links

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
    • 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
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The valve has a casing which bolts onto the end of the feed pump and has openings mating with the inlet and discharge passages of the pump. The casing contains two bores each of which contains a valve which has a plunger loaded by a spring and acted on by the pump discharge pressure. The plunger partially obscures a throttling opening which allows fuel to flow back to the inlet of the pump. The size of the opening increases with increasing fuel pressure. The two valves have springs of different ratings and the combined valve characteristic is a combination of the two individual ones. The fuel pressure is kept more nearly constant at varying engine speed than is possible with one valve only.
FR7438098A 1973-11-20 1974-11-20 Fuel injection pump for I.C. engine - has two pressure relief valves with differing characteristics Granted FR2251725A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5384173 1973-11-20

Publications (2)

Publication Number Publication Date
FR2251725A1 true FR2251725A1 (en) 1975-06-13
FR2251725B1 FR2251725B1 (en) 1977-03-25

Family

ID=10469153

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7438098A Granted FR2251725A1 (en) 1973-11-20 1974-11-20 Fuel injection pump for I.C. engine - has two pressure relief valves with differing characteristics

Country Status (5)

Country Link
JP (1) JPS5083625A (en)
BR (1) BR7409682A (en)
DE (1) DE2454712A1 (en)
ES (1) ES432364A1 (en)
FR (1) FR2251725A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463271A1 (en) * 1979-08-07 1981-02-20 Bosch Gmbh Robert FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
CN107339222A (en) * 2016-04-28 2017-11-10 科际精密股份有限公司 pressure relief device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463271A1 (en) * 1979-08-07 1981-02-20 Bosch Gmbh Robert FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
CN107339222A (en) * 2016-04-28 2017-11-10 科际精密股份有限公司 pressure relief device

Also Published As

Publication number Publication date
JPS5083625A (en) 1975-07-07
FR2251725B1 (en) 1977-03-25
BR7409682A (en) 1976-05-25
DE2454712A1 (en) 1975-05-22
ES432364A1 (en) 1977-01-01

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Legal Events

Date Code Title Description
ST Notification of lapse