US3771507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection systems
Assignee: Associated Engineering Ltd
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Filing: 1971-09-30
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Granted: 1973-11-13
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Expires: 1991-09-30
Abstract
Abstract This invention relates to a fuel injection system and to a fuel pressure regulator therefor. A fuel injection system, for injecting pressurised fuel into an inlet duct or manifold of an engine includes a fuel-flow metering orifice which is fed with the pressurised fuel and which is exposed on its downstream side to the pressure obtaining in the inlet duct or manifold, and a fuel pressure regulator is arranged to regulate the fuel to a pressure which exceeds the inlet duct pressure by an amount which increases with increasing inlet duct absolute pressure.
Inventors
- 👤 B Silvester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:23
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/16; F02M69/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
In a fuel pressure regulator for use in a fuel injection system arranged to inject fuel into a duct in an engine, said regulator comprising, means defining an aperture the degree of opening of which affects said fuel pressure, a member having a first area exposed to the pressure of the fuel to be regulated so that said fuel pressure generates a force on said member uring it to open said aperture and thereby reduce said fuel pressure, a surface in said regulator having a second area exposed to the pressure of air in said duct and positioned to generate a force on said member in response to said air pressure urging said member to close said aperture and thereby increase said fuel pressure, the improvement according to which the surface having said second area transmits to said movable member a force which is greater in proportion to the pressure exerted by said air on said second area than the force generated by said fuel on said member in proportion to the fuel pressure to which said first area is exposed.
Claim 2
Dependent Claim
181 words
In a fuel pressure regulator for use in a fuel injection system arranged to inject fuel into a duct in an engine, said regulator comprising, means defining an aperture the degree of opening of which affects said fuel pressure, a member having a first area exposed to the pressure of the fuel to be regulated so that said fuel pressure generates a force on said member uring it to open said aperture and thereby reduce said fuel pressure, a surface in said regulator having a second area exposed to the pressure of air in said duct and positioned to generate a force on said member in response to said air pressure urging said member to close said aperture and thereby increase said fuel pressure, the improvement according to which the surface having said second area transmits to said movable member a force which is greater in proportion to the pressure exerted by said air on said second area than the force generated by said fuel on said member in proportion to the fuel pressure to which said first area is exposed.
Claim 3
Dependent Claim
47 words
A fuel pressure regulator as claimed in claim 1, wherein said member is a plunger including the first area subject to the fuel pressure to be regulated and said surface having the second area is a diaphragm connected to said plunger and subjected to inlet duct pressure.
Claim 4
Dependent Claim
59 words
A fuel pressure regulator as claimed in claim 2, wherein said plunger operates in a bore and a corner of a shoulder formed on the plunger cooperates with a corner of said bore to define a fuel metering aperture between said corners, and a low rate spring tends to urge the plunger in a direction to close said aperture.
Claim 5
Dependent Claim
103 words
A fuel pressure regulator as claimed in claim 3, wherein a second diaphragm is connected to said plunger and is subjected to fuel outlet pressure and the space between said two diaphragms is connected to a source of substantially constant pressure with respect to fuel pressure and inlet duct pressure, and further wherein the effective cross-sectional area of said second diaphragm is equal to the cross-sectional area of said corners, and the effective cross-sectional area of said first diaphragm and of the plunger which is exposed to inlet duct pressure is greater than the cross-sectional area of the sharp corner on said bore.
Claim 6
Dependent Claim
27 words
A fuel pressure regulator as claimed in claim 1, wherein the two areas are directly connected but the said second area is greater than the first area.
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 |