Patent US3983855A successfully refreshed from Google Patents.
US3983855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system
Assignee: CAV Ltd
•
Filing: 1975-03-27
•
Granted: 1976-10-05
•
Expires: 1995-03-27
Abstract
Abstract A fuel injection system for an internal combustion engine provided with a cylinder, a air of fluid pressure operable valve means to control the supply of pressure fluid to and allowing the escape of fluid from one end of the cylinder, with the valves operating at different pressures, a fluid pressure generator supplying the fluid pressure to the valves, an actuating piston in the cylinder, resilient means urging the actuating piston towards one end of the cylinder, with the actuating piston being moved against the action of the resilient means when fluid under pressure is admitted to one end of the cylinder, and a fuel pumping piston arranged to be operated by the actuating piston to displace fuel to an outlet.
Inventors
- 👤 Boaz Antony Jarrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:48
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/129; F02; F02D; F02D41/00; F02D41/20; F02D41/2096; F02D41/30; F02D41/38; F02D41/40; F02M; F02M47/00; F02M59/00; F02M59/02; F02M59/10; F02M59/105; F04B7/00; F04B7/02; F04B7/0266; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/107; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
208 words
A fuel injection system for an internal combustion engine including a cylinder, a pair of fluid pressure operable valve means for controlling the supply of fluid under pressure to and allowing the escape of fluid from one end of said cylinder, said valve means operating at different pressures, a fluid pressure generator supplying the fluid pressure to said valve means, including a second cylinder, a second piston slidable within the second cylinder, with movement of the second piston in one direction acting to pressurize fluid contained in the second cylinder, a stack of piezo-electric crystals mechanically coupled to the second piston, said stack being divided into electrically isolated portions, and means for charging said portions of the stack of crystals to impart different movements to the second piston whereby to achieve different fluid pressure in the second cylinder, an actuating piston in said first mentioned cylinder, resilient means urging the actuating piston towards one end of the first mentioned cylinder, said actuating piston being moved against the action of said resilient means when fluid under pressure is admitted to said one end of the first mentioned cylinder, an outlet, and a fuel pumping piston arranged to be operated by said actuating piston to displace fuel to the outlet.
Claim 2
Dependent Claim
208 words
A fuel injection system for an internal combustion engine including a cylinder, a pair of fluid pressure operable valve means for controlling the supply of fluid under pressure to and allowing the escape of fluid from one end of said cylinder, said valve means operating at different pressures, a fluid pressure generator supplying the fluid pressure to said valve means, including a second cylinder, a second piston slidable within the second cylinder, with movement of the second piston in one direction acting to pressurize fluid contained in the second cylinder, a stack of piezo-electric crystals mechanically coupled to the second piston, said stack being divided into electrically isolated portions, and means for charging said portions of the stack of crystals to impart different movements to the second piston whereby to achieve different fluid pressure in the second cylinder, an actuating piston in said first mentioned cylinder, resilient means urging the actuating piston towards one end of the first mentioned cylinder, said actuating piston being moved against the action of said resilient means when fluid under pressure is admitted to said one end of the first mentioned cylinder, an outlet, and a fuel pumping piston arranged to be operated by said actuating piston to displace fuel to the outlet.
Claim 3
Dependent Claim
16 words
The system as claimed in claim 1 including a fuel injection nozzle connected to said outlet.
Claim 4
Dependent Claim
65 words
The system as claimed in claim 1 including a third cylinder in which said actuating piston is located, said first mentioned and third cylinders being co-axial with each other, said actuating piston defining a surface engaged by said resilient means whereby both the actuating piston and the fuel pumping piston are urged by the resilient means towards said one end of the first mentioned cylinder.
Claim 5
Dependent Claim
25 words
The system as claimed in claim 3 in which said outlet communicates with the remote end of said third cylinder from said first mentioned cylinder.
Claim 6
Dependent Claim
44 words
The system as claimed in claim 4 including a drain, valve means operable to place the remote end of the third cylinder in communication with the drain at a predetermined position during movement of the pistons towards the remote end of the third cylinder.
Claim 7
Dependent Claim
32 words
The system as claimed in claim 5 including means for supplying fuel to the remote end of the third cylinder during movement of the pistons under the action of the resilient means.
Claim 8
Dependent Claim
47 words
The system as claimed in claim 1 in which the one of said pair of valve means which operates to prevent escape of fluid from said one end of the first mentioned cylinder operates at a lower pressure than the other of said pair of valve means.
Claim 9
Dependent Claim
23 words
The system as claimed in claim 6 in which the source of fluid for said one end of the cylinder comprises an accumulator.
Claim 10
Dependent Claim
39 words
The system as claimed in claim 8 including a fuel injection nozzle connected to said outlet, said nozzle including a fluid pressure operable valve member which is biased to a closed position by fluid under pressure from said accumulator.
Claim 11
Dependent Claim
50 words
The system as claimed in claim 9 in which the valve member of the injection nozzle has a smaller area subjected to the pressure at said outlet than its area which is subjected to the accumulator pressure, with said third piston having a smaller area than said first mentioned 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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |