US3869226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel pumping apparatus
Assignee: CAV Ltd
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Filing: 1973-09-12
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Granted: 1975-03-04
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Expires: 1993-09-12
Abstract
Abstract A fuel pumping apparatus for supplying fuel to an internal combustion engine includes an angularly movable cam, the setting of which is determined by a piston housing a servo-valve. The servo-valve is subjected to a control pressure and moves to admit or release fluid from the cylinder containing the piston. For this purpose, a port is provided which is controlled by a land on the servo-valve. The land is shaped so that on angular movement of the servo-valve, a variation in the setting of the piston will occur and thereby a variation in the setting of the cam.
Inventors
- 👤 Stanislaw Jan Antoni Sosnowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:14
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/14; F02M41/1405; F02M41/1411; F02M41/1416
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
233 words
A liquid fuel pumping apparatus for supplying fuel to an internal combustion engine, the apparatus being of the kind comprising a plunger located within a bore, cam means for effecting movement of the plunger, a fluid pressure operable piston for adjusting the setting of the cam means, an axially movable servo-valve for controlling the application of fluid pressure to the piston, said servo valve being subjected to a fluid control pressure generated within the apparatus, the apparatus also including a manual control whereby the quantity of fuel supplied to the engine at each injection stroke of the apparatus can be varied, a bore formed in the piston, said piston bore slidably accommodating said servo valve, passage means conveying said fluid control pressure so that it can act on the valve in opposition to the force exerted by resilient means, a port formed in the wall of the piston bore and through which fluid can flow to and escape from the cylinder accommodating the piston, a control land on said servo valve for controlling fluid flow through said port, said servo-valve and piston constitutiNg a follow-up servo-system, means coupling said servo-valve with said manual control, said land being shaped so that angular movement of the servo-valve will, for a given axial position of the servo-valve, effect uncovering of the port thereby to cause axial movement of the piston and adjustment of said cam means.
Claim 2
Dependent Claim
233 words
A liquid fuel pumping apparatus for supplying fuel to an internal combustion engine, the apparatus being of the kind comprising a plunger located within a bore, cam means for effecting movement of the plunger, a fluid pressure operable piston for adjusting the setting of the cam means, an axially movable servo-valve for controlling the application of fluid pressure to the piston, said servo valve being subjected to a fluid control pressure generated within the apparatus, the apparatus also including a manual control whereby the quantity of fuel supplied to the engine at each injection stroke of the apparatus can be varied, a bore formed in the piston, said piston bore slidably accommodating said servo valve, passage means conveying said fluid control pressure so that it can act on the valve in opposition to the force exerted by resilient means, a port formed in the wall of the piston bore and through which fluid can flow to and escape from the cylinder accommodating the piston, a control land on said servo valve for controlling fluid flow through said port, said servo-valve and piston constitutiNg a follow-up servo-system, means coupling said servo-valve with said manual control, said land being shaped so that angular movement of the servo-valve will, for a given axial position of the servo-valve, effect uncovering of the port thereby to cause axial movement of the piston and adjustment of said cam means.
Claim 3
Dependent Claim
23 words
An apparatus as claimed in claim 1 in which said land has at least two sections which are axially displaced from each other.
Claim 4
Dependent Claim
15 words
An apparatus as claimed in claim 1 in which said land is of helicoidal form.
Claim 5
Dependent Claim
88 words
An apparatus as claimed in claim 1 in which said servo valve is provided with an extension of semi-circular section having its plane surface extending along the axis of the servo-valve, there being provided an angularly adjustable member having a further extension of semi-circular section, the plane surfaces of said extensions engaging with each other whereby angular movement of the member will effect angular movement of the servo-valve, while allowing relative axial movement of the servo-valve and member and link means coupling said member to said manual control.
Claim 6
Dependent Claim
18 words
An apparatus as claimed in claim 4 in which said link means includes a link of adjustable length.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |