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 characteristicsInfo
- 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
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.
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)
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 |
-
1974
- 1974-11-19 BR BR968274A patent/BR7409682A/en unknown
- 1974-11-19 DE DE19742454712 patent/DE2454712A1/en active Pending
- 1974-11-20 FR FR7438098A patent/FR2251725A1/en active Granted
- 1974-11-20 ES ES432364A patent/ES432364A1/en not_active Expired
- 1974-11-20 JP JP49133501A patent/JPS5083625A/ja active Pending
Cited By (2)
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 |
DE2454712A1 (en) | 1975-05-22 |
BR7409682A (en) | 1976-05-25 |
ES432364A1 (en) | 1977-01-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |