US3771506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump and automatic timing means therefor
Assignee: Stanadyne LLC
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Filing: 1972-06-07
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Granted: 1973-11-13
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Expires: 1992-06-07
Abstract
Abstract A fuel injection pump is provided with timing control in which a hollow cap removably mounted in a bore of the fuel pump forms a pressure chamber in which the advance piston is axially movable for controlling the timing of injection. An annulus around the cap provides a passage for the delivery of pressurized fuel to the pressure chamber and a flat reed valve in the pressure chamber overlying the inlet port of the pressure chamber isolates the ring seals for sealing the annulus from the repetitive high pressure pulses imposed when the pumping plungers move past the cam lobes during pumping strokes which otherwise may cause the seals to be extruded into the clearance gap between the cap and the bore.
Inventors
- 👤 C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:05
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/14; F02M41/1405; F02M41/1411; F02M41/1416
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
A fuel injection pump comprising a cam, pump plungers movable relative to the cam to translate the contour of the cam into sequential pumping strokes, a source of fluid under a pressure correlated with an operating condition of the associated engine, a bore in said pump, a removable cap forming a pressure chamber and cooperating with said bore to define a passage for the delivery of fluid to the inlet port of said pressure chamber from said source, seals interposed between said cap and said bore to prevent leakage from said passage, a piston movable in said chamber, a connector connecting the piston to the cam to control the position of the cam to advance and retard the relative timing of the pumping strokes, and a one-way valve in said pressure chamber overlying said inlet port to confine within said pressure chamber the pressure pulses resulting from the forces imposed on said cam by the pumping strokes.
Claim 2
Dependent Claim
157 words
A fuel injection pump comprising a cam, pump plungers movable relative to the cam to translate the contour of the cam into sequential pumping strokes, a source of fluid under a pressure correlated with an operating condition of the associated engine, a bore in said pump, a removable cap forming a pressure chamber and cooperating with said bore to define a passage for the delivery of fluid to the inlet port of said pressure chamber from said source, seals interposed between said cap and said bore to prevent leakage from said passage, a piston movable in said chamber, a connector connecting the piston to the cam to control the position of the cam to advance and retard the relative timing of the pumping strokes, and a one-way valve in said pressure chamber overlying said inlet port to confine within said pressure chamber the pressure pulses resulting from the forces imposed on said cam by the pumping strokes.
Claim 3
Dependent Claim
14 words
The fuel pump of claim 1 wherein said valve is a flat reed valve.
Claim 4
Dependent Claim
29 words
The pump of claim 2 wherein mating shoulders on said cap and said piston serve as a stop to limit the movement of the piston toward said pressure chamber.
Claim 5
Dependent Claim
21 words
The pump of claim 3 wherein an adjustable biasing spring within said pressure chamber biases said piston toward the pressure chamber.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |