US3780716A - Fuel injection systems - Google Patents
Fuel injection systems Download PDFInfo
- Publication number
- US3780716A US3780716A US00226793A US22679372A US3780716A US 3780716 A US3780716 A US 3780716A US 00226793 A US00226793 A US 00226793A US 22679372 A US22679372 A US 22679372A US 3780716 A US3780716 A US 3780716A
- Authority
- US
- United States
- Prior art keywords
- fuel
- nozzle
- accumulator
- piston
- valve means
- 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
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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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
- F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
Definitions
- F02m 39/00, F02m 49/07 tween the injector and the accumulator is a Piston [58] Field of Search 123/139 DP, 139 R, Slidable within a Cylinder, the Piston being urged in 123/19 139 AS one direction by the flow of fuel and in the event that the valve means fails and remains in the open position, 5 References Cited the piston moves a further amount into contact with a UNITED STATES PATENTS seating to prevent further flow of fuel through the no z- 2,0o7,s71 7/1935 Oldham 123/139 2,348,282 5/1944 Bremser 123/l39 5 Claims, 1 Drawing Figure FUEL INJECTION SYSTEMS
- This invention relates to fuel injection systems for supplying fuel to internal combustion engines and of the kind comprising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel from the accumulator is directed into a combustion space of an engine, and valve means which is opened for a predetermined time to control the
- valve means With such systems there is a danger that the valve means could remain in the open position due to some malfunction. In this event the accumulator will discharge its compressed volume of fuel into the engine through the nozzle and this could damage the engine.
- the object of the present invention is to provide a system of the kind specified in a simple and convenient form and in which the maximum quantity of fuel which can be discharged to the engine through the nozzle is limited.
- a valve operable to allow a normal flow of fuel to the engine, said valve closing to prevent more than a predetermined volume of fuel to flow to the engine.
- a piston slidable within a cylinder, the piston being urged in one direction by the flow of fuel to the nozzle and in the event of failure of said valve means in the open position, the piston being urged an extra amount in said direction to co-operate with a seating thereby to prevent further flow of fuel through the nozzle.
- the accumulator is connected to an injection nozzle 11 and through which fuel flows into a combustion space of an associated engine (not shown).
- the actual quantity of fuel flowing through the nozzle is controlled by a valve means conveniently accommodated within the nozzle and arranged to be opened for a predetermined time. In this manner the quantity of fuel which is supplied to the engine is controlled.
- valve in the form of a piston 12 which is located and slidable within a cylinder 13.
- One end of the cylinder communicates with the accumulator and the other end of the cylinder communicates with the injection nozzle.
- the piston 12 is loaded by a coiled compression spring 15 towards a step 16 defined on the wall of the cylinder.
- a passage 17 incorporating a restriction 18 The passage 17 remote from the step 16 communicates with a transverse drilling formed in the piston.
- the area of the seating is so arranged that the piston 12 will be retained upon the seating by the fluid pressure acting thereof and in this event no more fuel can be supplied to the nozzle 11.
- the dimension of the restrictor 18 is carefully chosen as also is the rating of the spring, to ensure that the piston can return to its stop between the injection periods and the quantity of fuel which flows past the restrictor during the pumping stroke is kept to a minimum.
- a fuel injection system for supplying fuel to an internal combustion engine and of the kind comprising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel can flow from the accumulator into a combustion space of the engine, valve means operable'for a predetermined time to control the quantity of fuel supplied through the nozzle, a further valve means disposed intermediate the accumulator and the nozzle, said further valve means being operable to allow normal flow of fuel to the engine, said further valve means closing to prevent more than a predetermined volume of fuel to flow to the engine.
- a fuel injection system for supplying fuel to an internal combustion engine and of the kind comrpising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel can flow from the accumulator into a combustion space of the engine, valve means operable for a predetermined time to control the quantity of fuel supplied through the nozzle, a cylinder provided intermediate the accumulator and the nozzle, said cylinder having its opposite ends communicating with the accumulator and nozzle respectively, a piston slidable within said cylinder, a seating defined at the end of the cylinder communicating with said nozzle, the piston being urged in one direction by the flow of fuel to the nozzle and in the event of failure of said valve means in the open position, the piston being urged an extra amount in said one direction to co-operate with said seating thereby to prevent further flow of fuel through the nozzle.
- a system according to claim 2 including resilient means loading said piston away from said seating.
- a system as claimed in claim 3 including a passage placing the opposite ends of the cylinder in communication with each other, said passage incorporating a restrictor.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
A fuel injection system for an internal combustion engine includes an accumulator in which fuel is stored at high pressure and an injector through which fuel flows to the combustion space of an associated engine. The injector incorporates valve means to control the quantity of fuel supplied to the engine and interposed between the injector and the accumulator is a piston slidable within a cylinder, the piston being urged in one direction by the flow of fuel and in the event that the valve means fails and remains in the open position, the piston moves a further amount into contact with a seating to prevent further flow of fuel through the nozzle.
Description
o Unite States Patent [1 3,780,716 Fenne Dec. 25, 1973 [5 FUEL INJECTION SYSTEMS 2,090,350 8/1937 Heinrich 123 139 19 [75] Inventor: Ivor Fenne, Greenford, England 348l3l5 12/ 69 Thomber 123/32 [73] Assignee: C.A.V. Limited, Birmingham, Primary ExaminerLaurence M. Goodridge England Assistant ExaminerRonald B. Cox [22] Filed: Feb. 16, 1972 Attorney-John Holman et al.
1 1 pp 226.793 57 ABSTRACT A fuel injection system for an internal combustion en- [30] Foreign Application Priority Data gine includes an accumulator in which fuel is stored at Feb. 18, 1971 Great Britain 5,032/71 high Pressure and an injector through which fuel flows to the combustion space of an associated engine. The 52 s (1123/1351 AS, 123 9 p 23 19 DB, injector incorporates valve means to control the quan- 23/19 F tity of fuel supplied to the engine and interposed be- [51] Int. Cl. F02m 39/00, F02m 49/07 tween the injector and the accumulator is a Piston [58] Field of Search 123/139 DP, 139 R, Slidable within a Cylinder, the Piston being urged in 123/19 139 AS one direction by the flow of fuel and in the event that the valve means fails and remains in the open position, 5 References Cited the piston moves a further amount into contact with a UNITED STATES PATENTS seating to prevent further flow of fuel through the no z- 2,0o7,s71 7/1935 Oldham 123/139 2,348,282 5/1944 Bremser 123/l39 5 Claims, 1 Drawing Figure FUEL INJECTION SYSTEMS This invention relates to fuel injection systems for supplying fuel to internal combustion engines and of the kind comprising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel from the accumulator is directed into a combustion space of an engine, and valve means which is opened for a predetermined time to control the quantity of fuel supplied through the nozzle.
With such systems there is a danger that the valve means could remain in the open position due to some malfunction. In this event the accumulator will discharge its compressed volume of fuel into the engine through the nozzle and this could damage the engine.
The object of the present invention is to provide a system of the kind specified in a simple and convenient form and in which the maximum quantity of fuel which can be discharged to the engine through the nozzle is limited.
According to the invention in a system of the kind specified there is disposed intermediate the accumulator and the nozzle, a valve operable to allow a normal flow of fuel to the engine, said valve closing to prevent more than a predetermined volume of fuel to flow to the engine.
According to a further feature of the invention in a system of the kind specified there is provided intermediate the accumulator and the nozzle, a piston slidable within a cylinder, the piston being urged in one direction by the flow of fuel to the nozzle and in the event of failure of said valve means in the open position, the piston being urged an extra amount in said direction to co-operate with a seating thereby to prevent further flow of fuel through the nozzle.
One example of a fuel injection system in accordance with the invention will now be described with reference to the accompanying drawing. Shown at is an accumulator which is charged with fuel under pressure by means of a pump (not shown).
The accumulator is connected to an injection nozzle 11 and through which fuel flows into a combustion space of an associated engine (not shown). The actual quantity of fuel flowing through the nozzle is controlled by a valve means conveniently accommodated within the nozzle and arranged to be opened for a predetermined time. In this manner the quantity of fuel which is supplied to the engine is controlled.
With such a system there is a danger that in the event that the valve means should remain open, the compressed volume of fuel in the accumulator 19 will be discharged through the nozzle into the combustion space of the engine. This could cause damage to the engme.
In order to limit the maximum quantity of fuel which is supplied to the engine there is provided valve in the form of a piston 12 which is located and slidable within a cylinder 13. One end of the cylinder communicates with the accumulator and the other end of the cylinder communicates with the injection nozzle. At this end of the cylinder there is formed a seating 14 against which the adjacent end of the piston 12 can co-operate to prevent flow of fuel to the nozzle. The piston 12 is loaded by a coiled compression spring 15 towards a step 16 defined on the wall of the cylinder. Moreover, formed within the piston is a passage 17 incorporating a restriction 18. The passage 17 remote from the step 16 communicates with a transverse drilling formed in the piston.
In use, fuel flows from the accumulator to the nozzle 11 when the valve means in the nozzle is opened and -the piston 12 is displaced against the action of the spring 15. Providing no more than a predetermined quantity of fuel is supplied then the piston 12 will not contact the seating and when the valve means in the nozzle is closed the piston will return to its original position on the step 16, under the action of the spring 15, fuel being displaced between the ends of the piston by way of the passage 17. In the event that the valve means should remain open then the piston will move into contact with the seat 14 and thereby further flow of fuel through the nozzle will be prevented.
The area of the seating is so arranged that the piston 12 will be retained upon the seating by the fluid pressure acting thereof and in this event no more fuel can be supplied to the nozzle 11. The dimension of the restrictor 18 is carefully chosen as also is the rating of the spring, to ensure that the piston can return to its stop between the injection periods and the quantity of fuel which flows past the restrictor during the pumping stroke is kept to a minimum.
I claim:
1. A fuel injection system for supplying fuel to an internal combustion engine and of the kind comprising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel can flow from the accumulator into a combustion space of the engine, valve means operable'for a predetermined time to control the quantity of fuel supplied through the nozzle, a further valve means disposed intermediate the accumulator and the nozzle, said further valve means being operable to allow normal flow of fuel to the engine, said further valve means closing to prevent more than a predetermined volume of fuel to flow to the engine.
2. A fuel injection system for supplying fuel to an internal combustion engine and of the kind comrpising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel can flow from the accumulator into a combustion space of the engine, valve means operable for a predetermined time to control the quantity of fuel supplied through the nozzle, a cylinder provided intermediate the accumulator and the nozzle, said cylinder having its opposite ends communicating with the accumulator and nozzle respectively, a piston slidable within said cylinder, a seating defined at the end of the cylinder communicating with said nozzle, the piston being urged in one direction by the flow of fuel to the nozzle and in the event of failure of said valve means in the open position, the piston being urged an extra amount in said one direction to co-operate with said seating thereby to prevent further flow of fuel through the nozzle.
3. A system according to claim 2 including resilient means loading said piston away from said seating.
4. A system as claimed in claim 3 including a passage placing the opposite ends of the cylinder in communication with each other, said passage incorporating a restrictor.
5. A system as claimed in claim 4 in which said passage and restrictor are formed in the piston.
Claims (5)
1. A fuel injection system for supplying fuel to an internal combustion engine and of the kind comprising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel can flow from the accumulator into a combustion space of the engine, valve means operable for a predetermined time to control the quantity of fuel supplied through the nozzle, a further valve means disposed intermediate the accumulator and the nozzle, said further valve means being operable to allow normal flow of fuel to the engine, said further valve means closing to prevent more than a predetermined volume of fuel to flow to the engine.
2. A fuel injection system for supplying fuel to an internal combustion engine and of the kind comrpising an accumulator in which fuel is stored under pressure, an injection nozzle through which fuel can flow from the accumulator into a combustion space of the engine, valve means operable for a predetermined time to control the quantity of fuel supplied through the nozzle, a cylinder provided intermediate the accumulator and the nozzle, said cylinder having its opposite ends communicating with the accumulator and nozzle respectively, a piston slidable within said cylinder, a seating defined at the end of the cylinder communicating with said nozzle, the piston being urged in one direction by the flow of fuel to the nozzle and in the event of failure of said valve means in the open position, the piston being urged an extra amount in said one direction to co-operate with said seating thereby to prevent further flow of fuel through the nozzle.
3. A system according to claim 2 including resilient means loading said piston away from said seating.
4. A system as claimed in claim 3 including a passage placing the opposite ends of the cylinder in communication with each other, said passage incorporating a restrictor.
5. A system as claimed in claim 4 in which said passage and restrictor are formed in the piston.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB503271 | 1971-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3780716A true US3780716A (en) | 1973-12-25 |
Family
ID=9788458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00226793A Expired - Lifetime US3780716A (en) | 1971-02-19 | 1972-02-16 | Fuel injection systems |
Country Status (6)
Country | Link |
---|---|
US (1) | US3780716A (en) |
BR (1) | BR7200906D0 (en) |
DE (1) | DE2207643A1 (en) |
ES (1) | ES177456Y (en) |
FR (1) | FR2125946A5 (en) |
IT (1) | IT954308B (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4246876A (en) * | 1979-01-19 | 1981-01-27 | Stanadyne, Inc. | Fuel injection system snubber valve assembly |
US5551403A (en) * | 1994-08-04 | 1996-09-03 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh | Fuel supply quantity limiting arrangement |
WO2000039452A2 (en) * | 1998-12-28 | 2000-07-06 | Robert Bosch Gmbh | Fuel injection device |
US20030000581A1 (en) * | 2001-06-27 | 2003-01-02 | Kai Lehtonen | Fuel system shut-off valve |
WO2004063558A1 (en) * | 2003-01-15 | 2004-07-29 | Wärtsilä Finland Oy | Arrangement in fuel injection apparatus |
US7661410B1 (en) * | 2008-08-18 | 2010-02-16 | Caterpillar Inc. | Fluid leak limiter |
WO2010130492A1 (en) * | 2009-05-14 | 2010-11-18 | Robert Bosch Gmbh | Valve for a fuel injection system |
EP3023628A1 (en) | 2014-11-21 | 2016-05-25 | O.M.T. Officine Meccaniche Torino S.p.A. | A fuel flow limiting valve for large internal combustion engines |
EP3146195B1 (en) * | 2014-05-22 | 2019-07-24 | Wärtsilä Finland Oy | Connecting element for fuel injection system |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2918147A1 (en) * | 1979-05-05 | 1980-11-20 | Maschf Augsburg Nuernberg Ag | FUEL INJECTION DEVICE FOR AN INTERNAL COMBUSTION ENGINE |
FR2502701A1 (en) * | 1981-03-26 | 1982-10-01 | Renault Vehicules Ind | INJECTOR INJECTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE |
FR2558533B1 (en) * | 1984-01-23 | 1986-06-13 | Renault | SAFETY DEVICE FOR AN INJECTION VALVE OF AN INTERNAL COMBUSTION ENGINE |
DE4344190A1 (en) * | 1993-12-23 | 1995-06-29 | Orange Gmbh | Fuel injector with high pressure fuel accumulator |
DE4414242A1 (en) * | 1994-04-23 | 1995-10-26 | Bosch Gmbh Robert | Fuel injection device for internal combustion engines |
DE19747092B4 (en) * | 1997-10-24 | 2005-01-13 | Siemens Ag | Flow limiting device for internal combustion engines |
AT513158B1 (en) | 2012-04-10 | 2014-03-15 | Bosch Gmbh Robert | Flow restrictor with ball and throttle |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2007871A (en) * | 1932-08-06 | 1935-07-09 | Oldham Richard | Oil or other liquid fuel pump |
US2090350A (en) * | 1934-12-22 | 1937-08-17 | Bosch Robert | Injection internal combustion engine |
US2348282A (en) * | 1941-05-01 | 1944-05-09 | Bendix Aviat Corp | Fuel injection apparatus |
US3481315A (en) * | 1966-11-11 | 1969-12-02 | Cav Ltd | Liquid fuel supply systems for internal combustion engines |
-
1972
- 1972-02-12 ES ES1972177456U patent/ES177456Y/en not_active Expired
- 1972-02-16 US US00226793A patent/US3780716A/en not_active Expired - Lifetime
- 1972-02-16 FR FR7205148A patent/FR2125946A5/fr not_active Expired
- 1972-02-17 IT IT48381/72A patent/IT954308B/en active
- 1972-02-18 BR BR906/72A patent/BR7200906D0/en unknown
- 1972-02-18 DE DE19722207643 patent/DE2207643A1/de active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2007871A (en) * | 1932-08-06 | 1935-07-09 | Oldham Richard | Oil or other liquid fuel pump |
US2090350A (en) * | 1934-12-22 | 1937-08-17 | Bosch Robert | Injection internal combustion engine |
US2348282A (en) * | 1941-05-01 | 1944-05-09 | Bendix Aviat Corp | Fuel injection apparatus |
US3481315A (en) * | 1966-11-11 | 1969-12-02 | Cav Ltd | Liquid fuel supply systems for internal combustion engines |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4246876A (en) * | 1979-01-19 | 1981-01-27 | Stanadyne, Inc. | Fuel injection system snubber valve assembly |
US5551403A (en) * | 1994-08-04 | 1996-09-03 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh | Fuel supply quantity limiting arrangement |
WO2000039452A2 (en) * | 1998-12-28 | 2000-07-06 | Robert Bosch Gmbh | Fuel injection device |
WO2000039452A3 (en) * | 1998-12-28 | 2001-03-08 | Bosch Gmbh Robert | Fuel injection device |
US6374802B1 (en) * | 1998-12-28 | 2002-04-23 | Robert Bosch Gmbh | Fuel injection system |
US20030000581A1 (en) * | 2001-06-27 | 2003-01-02 | Kai Lehtonen | Fuel system shut-off valve |
CN100402833C (en) * | 2001-06-27 | 2008-07-16 | 瓦特西拉技术有限公司 | Cut-off valve for fuel system |
US6953052B2 (en) * | 2001-06-27 | 2005-10-11 | Wartsila Technology Oy Ab | Fuel system shut-off valve |
US20060096578A1 (en) * | 2003-01-15 | 2006-05-11 | Kai Lehtonen | Arrangement in fuel injection apparatus |
US7237533B2 (en) | 2003-01-15 | 2007-07-03 | Wartsila Finland Oy | Arrangement in fuel injection apparatus |
WO2004063558A1 (en) * | 2003-01-15 | 2004-07-29 | Wärtsilä Finland Oy | Arrangement in fuel injection apparatus |
US7661410B1 (en) * | 2008-08-18 | 2010-02-16 | Caterpillar Inc. | Fluid leak limiter |
US20100037863A1 (en) * | 2008-08-18 | 2010-02-18 | Caterpillar Inc. | Fluid leak limiter |
WO2010130492A1 (en) * | 2009-05-14 | 2010-11-18 | Robert Bosch Gmbh | Valve for a fuel injection system |
EP3146195B1 (en) * | 2014-05-22 | 2019-07-24 | Wärtsilä Finland Oy | Connecting element for fuel injection system |
EP3023628A1 (en) | 2014-11-21 | 2016-05-25 | O.M.T. Officine Meccaniche Torino S.p.A. | A fuel flow limiting valve for large internal combustion engines |
Also Published As
Publication number | Publication date |
---|---|
ES177456Y (en) | 1973-03-01 |
DE2207643A1 (en) | 1972-08-31 |
ES177456U (en) | 1972-09-16 |
BR7200906D0 (en) | 1973-05-03 |
IT954308B (en) | 1973-08-30 |
FR2125946A5 (en) | 1972-09-29 |
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