Patent US2806701A successfully refreshed from Google Patents.
US3752136A
Expired / Lapsed
US
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Liquid fuel injection pumping apparatus
Assignee: CAV Ltd
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Filing: 1971-07-08
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Granted: 1973-08-14
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Expires: 1991-07-08
Abstract
Abstract A fuel injection pumping apparatus includes an accumulator, a pump for charging the accumulator with fuel under pressure and a differential valve for controlling fuel flow from the accumulator to an orifice. In addition, a control valve is provided to control the application of fuel under pressure to the differential valve, the control valve embodying a valve element which is lifted from its seating to apply fuel to the differential valve, and there is in addition, a piston which upon closure of the control valve, moves to reduce the pressure acting on the differential valve.
Inventors
- 👤 I Fenne
- 👤 B Knight
- 👤 H Hodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:11
CPC Classifications
F; F02; F02M; F02M47/00; F02M47/02; F02D; F02D1/00; F02D1/02; F02D1/08; F02D1/12; F02D1/122
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
185 words
A liquid fuel injection pumping apparatus of the kind comprising an accumulator, a pump for charging the accumulator with liquid fuel, an orifice through which liquid fuel can flow to an engine, a differential valve for controlling the flow of fuel from the accumulator through said orifice, the differential valve including a valve member which is loaded towards the closed position by fluid under pressure acting on one end of the valve member, said valve member being opened by fuel under pressure derived from the accumulator and acting on the other end of the valve member, a fuel control valve for controlling the flow of fuel from the accumulator to the differential valve, said fuel control valve including a valve element which is lifted from its seating to permit fuel flow to the differential valve, a cylinder one end of which is connected to a point intermediate the control valve and the differential valve, a piston member disposed in said cylinder said piston member moving after closure of the valve element onto its seating, to lower the fuel pressure downstream of the fuel control valve.
Claim 2
Dependent Claim
185 words
A liquid fuel injection pumping apparatus of the kind comprising an accumulator, a pump for charging the accumulator with liquid fuel, an orifice through which liquid fuel can flow to an engine, a differential valve for controlling the flow of fuel from the accumulator through said orifice, the differential valve including a valve member which is loaded towards the closed position by fluid under pressure acting on one end of the valve member, said valve member being opened by fuel under pressure derived from the accumulator and acting on the other end of the valve member, a fuel control valve for controlling the flow of fuel from the accumulator to the differential valve, said fuel control valve including a valve element which is lifted from its seating to permit fuel flow to the differential valve, a cylinder one end of which is connected to a point intermediate the control valve and the differential valve, a piston member disposed in said cylinder said piston member moving after closure of the valve element onto its seating, to lower the fuel pressure downstream of the fuel control valve.
Claim 3
Dependent Claim
23 words
An apparatus as claimed in claim 1 in which said valve element is lifted from its seating by movement of said piston member.
Claim 4
Dependent Claim
29 words
An apparatus as cLaimed in claim 2 in which fluid under pressure is utilised to effect movement of the piston member to lift the valve element from its seat.
Claim 5
Dependent Claim
41 words
An apparatus as claimed in claim 3 including an actuator piston for effecting movement of said piston member, and pump means operable in timed relationship with the associated engine for supplying fluid under pressure to effect movement of the actuator piston.
Claim 6
Dependent Claim
34 words
An apparatus as claimed in claim 4 in which the time during which said pump means maintain pressure on the actuator piston is adjustable to determine the quantity of fuel supplied by the apparatus.
Claim 7
Dependent Claim
21 words
An apparatus as claimed in claim 7 including a releif valve for determining the maximum pressure applied to said actuator piston.
Claim 8
Dependent Claim
30 words
An apparatus as claimed in claim 6 in which the fluid under pressure which is applied to the valve member to effect closure of same is derived from the accumulator.
Claim 9
Dependent Claim
49 words
An apparatus as claimed in claim 3 in which said piston member is subjected on its end remote from the valve element, to fuel under pressure derived from the accumulator, the application of fuel under pressure being controlled by a rotary valve operable in timed relationship with the engine.
Claim 10
Dependent Claim
59 words
An apparatus as claimed in claim 8 including an additional valve disposed between said rotary valve and the piston, said additional valve serving to reduce the pressure applied to said piston member, after a predetermined quantity of fuel has been supplied thereby to allow said piston member to move to allow the valve element to close onto its seating.
Claim 11
Dependent Claim
86 words
An apparatus as claimed in claim 9 in which said additional valve is actuated by a shuttle slidable within a cylinder, said cylinder at one end being in constant communication with the accumulator, and at its other end communicating with said fuel control valve, said shuttle displacing fuel from said other end of the cylinder to the orifice during its movement towards said other end of the cylinder, the additional valve being operated at a predetermined position of the shuttle to halt the delivery of fuel.
Claim 12
Dependent Claim
77 words
An apparatus as claimed in claim 10 including passage means on the rotary valve and through which fuel from the accumulator can be applied to said other end of the cylinder containing the shuttle, the supply of fuel to the other end of the cylinder from the accumulator acting in conjunction with a spring loading the shuttle, acting to return the shuttle and additional valve to the initial position, stop means being provided to determine said position.
Claim 13
Dependent Claim
24 words
An apparatus as claimed in claim 11 in which said stop means is adjustable to determine the quantity of fuel supplied by the apparatus.
Claim 14
Dependent Claim
35 words
An apparatus as claimed in claim 12 including a pressurising valve for determining the reduced pressure applied to said piston member when said additional valve operates after said predetermined quantity of fuel has been delivered.
Claim 15
Dependent Claim
27 words
An apparatus as claimed in claim 12 in which the setting of said stop means is controlled by governor responsive to the speed of the associated engine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |