Patent US4065526A successfully refreshed from Google Patents.
Patent US3796379A successfully refreshed from Google Patents.
US3796379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection nozzle units
Assignee: CAV Ltd
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Filing: 1972-10-24
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Granted: 1974-03-12
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Expires: 1992-10-24
Abstract
Abstract A liquid fuel injection nozzle unit comprises a valve member movable by fuel under pressure to permit fuel flow through an outlet, a spring acting to urge the valve member to prevent flow of fuel and a fluid pressure operable piston connected to the valve member subjected to a pressure of fuel which creates a force acting to assist the closure of the valve member. The fuel under pressure is obtained from the fuel which leaks past the valve member.
Inventors
- 👤 I Fenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:37
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/16; F02M61/20; F02M61/205
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
A liquid fuel injection nozzle unit comprising a body portion, a bore formed in the body portion, a valve member slidable within the bore, a seating defined in the bore, said valve member being shaped for co-operation with said seating, passage means through which fuel under pressure can be applied to said valve member to lift the valve member away from the seating to permit flow of fuel through an outlet, resilient means for urging the valve member into contact with the seating, a fluid pressure operable means operatively connected to said valve member, and a conduit through which fuel under pressure leaking between the valve member and the bore is applied to said means, so that the fuel under pressure acting on said means assists the action of the resilient means in closing the valve member onto the seating.
Claim 2
Dependent Claim
140 words
A liquid fuel injection nozzle unit comprising a body portion, a bore formed in the body portion, a valve member slidable within the bore, a seating defined in the bore, said valve member being shaped for co-operation with said seating, passage means through which fuel under pressure can be applied to said valve member to lift the valve member away from the seating to permit flow of fuel through an outlet, resilient means for urging the valve member into contact with the seating, a fluid pressure operable means operatively connected to said valve member, and a conduit through which fuel under pressure leaking between the valve member and the bore is applied to said means, so that the fuel under pressure acting on said means assists the action of the resilient means in closing the valve member onto the seating.
Claim 3
Dependent Claim
27 words
A nozzle unit as claimed in claim 1 in which said fluid pressure operable means defines a first surface against which the fuel under pressure can bear.
Claim 4
Dependent Claim
55 words
A nozzle unit as claimed in claim 2 in which said fluid pressure operable means defines a second surface which during closure of the valve displaces fluid, and means for controlling the rate of displacement of fluid to effect a control of the rate of movement of the valve member into contact with the seating.
Claim 5
Dependent Claim
15 words
A nozzle unit as claimed in claim 3 in which said means comprises an orifice.
Claim 6
Dependent Claim
22 words
A nozzle unit as claimed in claim 2 including valve means for controlling the pressure of fuel applied to said first surface.
Claim 7
Dependent Claim
65 words
A nozzle unit as claimed in claim 5 in which said fluid pressure operable means comprises a piston slidable within a cylinder, one end of the cylinder serving as an abutment for a spring forming said resilient means and an aperture in the other end of the cylinder and a push rod passing through the aperture to extend between the piston and the valve member.
Claim 8
Dependent Claim
28 words
A nozzle unit as claimed in claim 6 in which the spring acts upon an end of the piston, said end of the piston defining said first surface.
Claim 9
Dependent Claim
43 words
A nozzle unit as claimed in claim 7 in which a space is defined about said push rod, said space receiving the fuel leaking past the valve member, said space communicating by way of a conduit, with said one end of the cylinder.
Claim 10
Dependent Claim
18 words
A nozzle unit as claimed in claim 5 in which said fluid pressure operable means comprises a diaphragm.
Claim 11
Dependent Claim
36 words
A liquid fuel injection system including a plurality of nozzle units as claimed in claim 4 and including a single valve means for controlling the pressure of fuel applied to said first surfaces of the units.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |