US3780716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection systems
Assignee: CAV Ltd
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Filing: 1972-02-16
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Granted: 1973-12-25
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Expires: 1992-02-16
Abstract
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.
Inventors
- 👤 I Fenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:31
CPC Classifications
F; F02; F02M; F02M63/00; F02M63/02; F02M63/0205; F02M63/0215
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
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.
Claim 2
Dependent Claim
106 words
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.
Claim 3
Dependent Claim
157 words
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.
Claim 4
Dependent Claim
157 words
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.
Claim 5
Dependent Claim
16 words
A system according to claim 2 including resilient means loading said piston away from said seating.
Claim 6
Dependent Claim
27 words
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.
Claim 7
Dependent Claim
18 words
A system as claimed in claim 4 in which said passage and restrictor are formed in the piston.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |