US3789818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection systems
Assignee: CAV Ltd
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Filing: 1972-10-27
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Granted: 1974-02-05
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Expires: 1992-10-27
Abstract
Abstract A fuel system for an internal combustion engine includes an accumulator for storing fuel under pressure a plurality of injection valves connected to the accumulator through a conduit a shuttle member for controlling the amount of fuel flowing to the injection valves from the accumulator during an injection stroke and an additional valve operable to permit the return of the shuttle at the other end of the injection stroke.
Inventors
- 👤 J Asbery
- 👤 I Fenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:32
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/02; F02M59/10; F02M59/105; F02M47/00; F02M47/02; F02M51/00; F02M59/20; F02M59/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
A fuel injection system for supplying fuel to an internal combustion engine and comprising in combination, an accumulator for storing fuel under pressure, a fuel injection nozzle including a valve, the fuel injection nozzle having an inlet communicating with the accumulator by way of a conduit, first means for opening said valve to allow fuel to flow through an outlet of the nozzle, a further valve disposed in said conduit upstream of said valve, further means for opening said further valve, a cylinder the opposite ends of which communicate with said conduit on the opposite sides respectively of said further valve, a shutTle movable in said cylinder, resilient means loading said shuttle towards the end of the cylinder which communicates with the upstream side of the further valve and means for operating said valve in timed relationship with each other and with the engine with which the system is associated, the arrangement being such that with the first mentioned valve closed at the end of injection of fuel, the further valve is opened to allow the shuttle to move under the action of its resilient loading whereafter the further valve is closed and the first mentioned valve is opened when injection of fuel is required, the shuttle when the first mentioned vlave is opened moving against the action of its resilient loading and fuel is displaced from the end of the cylinder containing the spring.
Claim 2
Dependent Claim
235 words
A fuel injection system for supplying fuel to an internal combustion engine and comprising in combination, an accumulator for storing fuel under pressure, a fuel injection nozzle including a valve, the fuel injection nozzle having an inlet communicating with the accumulator by way of a conduit, first means for opening said valve to allow fuel to flow through an outlet of the nozzle, a further valve disposed in said conduit upstream of said valve, further means for opening said further valve, a cylinder the opposite ends of which communicate with said conduit on the opposite sides respectively of said further valve, a shutTle movable in said cylinder, resilient means loading said shuttle towards the end of the cylinder which communicates with the upstream side of the further valve and means for operating said valve in timed relationship with each other and with the engine with which the system is associated, the arrangement being such that with the first mentioned valve closed at the end of injection of fuel, the further valve is opened to allow the shuttle to move under the action of its resilient loading whereafter the further valve is closed and the first mentioned valve is opened when injection of fuel is required, the shuttle when the first mentioned vlave is opened moving against the action of its resilient loading and fuel is displaced from the end of the cylinder containing the spring.
Claim 3
Dependent Claim
68 words
A system as claimed in claim 1 including co-operating port means in the shuttle and cylinder whereby at a predetermined position in the movement of the shuttle against the action of its resilient loading the port means will be brought into communication so that the pressure of fuel downstream of the cylinder will be reduced to a lower value thereby to terminate injection of fuel to the engine.
Claim 4
Dependent Claim
36 words
A system as claimed in claim 2 in which the port means in the cylinder comprises a port in the wall thereof said port communicating with one end of a cylinder containing a resiliently loaded piston.
Claim 5
Dependent Claim
46 words
A system as claimed in claim 3 in which the valve members of said valve and said further valves are associated with pistons respectively which are subjected to the pressure of fuel within the accumulator whereby the valve members are pressure actuated towards the closed position.
Claim 6
Dependent Claim
21 words
A system as claimed in claim 4 including solenoids respectively for effecting movement of the valve members towards the open position.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |