US3910503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection nozzles
Assignee: CAV Ltd
•
Filing: 1974-05-02
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Granted: 1975-10-07
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Expires: 1994-05-02
Abstract
Abstract A fuel injection nozzle comprises a valve member which cooperates with the seating to control the flow of fuel through an orifice from an inlet. Resilient means is provided to urge the valve member into contact with the seating, and a non-return valve is provided so that fuel from the inlet can be applied to a surface of the valve member to assist the resilient means in maintaining the valve member in contact with the seating. The pressure which is applied to the valve member by way of the valve is controlled by the valve so that it is a proportion of the pressure at the inlet.
Inventors
- 👤 Stanley Frederick Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:22
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/16; F02M61/20; F02M61/205
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
In a fuel injection nozzle including a body having a fuel inlet and an outlet, an injection valve element movable in the body to control flow through the outlet, spring means biasing said valve element toward a closed position with respect to said outlet, said valve element having a pressure-actuating surface portion facing the outlet and exposed to inlet pressure whereby inlet pressure is effective to counter the closing effect of said spring means, and means including a pressure-reducing valve responsive to inlet pressure and acting on the injection valve element in a closing direction to augment the closing bias of the spring means.
Claim 2
Dependent Claim
104 words
In a fuel injection nozzle including a body having a fuel inlet and an outlet, an injection valve element movable in the body to control flow through the outlet, spring means biasing said valve element toward a closed position with respect to said outlet, said valve element having a pressure-actuating surface portion facing the outlet and exposed to inlet pressure whereby inlet pressure is effective to counter the closing effect of said spring means, and means including a pressure-reducing valve responsive to inlet pressure and acting on the injection valve element in a closing direction to augment the closing bias of the spring means.
Claim 3
Dependent Claim
48 words
A nozzle as claimed in claim 1 in which said pressure-reducing valve has an outlet communicating with a further surface to urge said injection valve element in a closing direction and whereby the pressure acting on said further surface is a proportion of the pressure at said inlet.
Claim 4
Dependent Claim
91 words
A nozzle as claimed in claim 2 in which said pressure-reducing valve includes a head and a stem connected to the head, the end of said stem remote from the head being exposed to a low pressure, said head being shaPed for co-operation with a seating, the face of said head remote from the stem being subjected to the pressure acting on said further surface and acting to close the head onto the seating, and the opposite face of the head being subjected to the pressure of fuel at said inlet.
Claim 5
Dependent Claim
21 words
A nozzle as claimed in claim 3 including further resilient means acting to urge said head into contact with the seating.
Claim 6
Dependent Claim
45 words
A nozzle as defined in claim 2 wherein the injection valve element and the pressure-reducing valve are manually slidable in the body, the body having a chamber between said injection valve element and pressure-reducing valve, the outlet of the pressure-reducing valve communicating with said chamber.
Claim 7
Dependent Claim
60 words
A nozzle as defined in claim 2 wherein the injection valve element and the pressure-reducing valve are manually slidable in the body, the body having a chamber between said injection valve element and pressure-reducing valve, the outlet of the pressure-reducing valve communicating with said chamber, and said spring means comprising a compression spring located in said chamber between said valves.
Claim 8
Dependent Claim
88 words
A nozzle as defined in claim 2 wherein the injection valve element and the pressure-reducing valve are manually slidable in the body, the body having a chamber between said injection valve element and pressure-reducing valve, the outlet of the pressure-reducing valve communicating with said chamber, said spring means comprising a compression spring located in said chamber between said valves, said spring means reacting against the injection element in a closing direction outwardly with respect to the body, the pressure-reducing valve being closable by movement in the opposite direction.
Claim 9
Dependent Claim
110 words
A nozzle as defined in claim 2 wherein the injection valve element and the pressure-reducing valve are manually slidable in the body, the body having a chamber between said injection valve element and pressure-reducing valve, the outlet of the pressure-reducing valve communicating with said chamber, said spring means comprising a compression spring located in said chamber between said valves, said spring means reacting against the injection element in a closing direction outwardly with respect to the body, the pressure-reducing valve being closable by movement in the opposite direction, inlet pressure being directed against pressure-reducing valve in an opening direction which tends to move it inwardly with respect to the chamber.
Claim 10
Dependent Claim
20 words
A nozzle as defined in claim 6 including additional spring means reacting against said pressure-reducing valve in a closing direction.
Claim 11
Dependent Claim
16 words
A nozzle as defined in claim 8 wherein said spring means reacts oppositely against both valves.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |