Patent US4279232A successfully refreshed from Google Patents.
US4279232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel system for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1978-12-04
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Granted: 1981-07-21
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Expires: 1998-12-04
Abstract
Abstract The invention pertains to a fuel system for internal combustion engines in which the unburned, heated fuel which is permitted to flow back to the tank from the fuel metering assembly is deaerated via an apparatus in order to prevent gases from re-entering the fuel supply pump when the fuel is reinduced thereto. By the inclusion of a jet pump between the fuel return line and the induction line, the degree of efficiency of the fuel supply pump is substantially increased.
Inventors
- 👤 Gregor Schuster
- 👤 Johann Schmid
- 👤 Erwin Schmuck
- 👤 Klaus Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:08
CPC Classifications
F; F02; F02M; F02M37/00; F02M37/20; F02M37/02; F02M37/025
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
181 words
A fuel system for an internal combustion engine comprising: a fuel tank; a fuel pump connected to said fuel tank by an induction conduit; a fuel metering assembly associated with said fuel pump for feeding fuel to said engine; a return conduit extending from said fuel metering assembly to said fuel tank to discharge excess fuel thereto; deaeration means included in said return conduit for deaerating said excess fuel, said deaeration means comprising a container positioned in said fuel tank, said container having an upper wall and air discharge means correlated therewith to permit air to flow therethrough; and fuel discharge means to permit make-up fuel from said fuel tank and deaerated excess fuel from said container to flow into said induction conduit, said fuel discharge means including first inlet means for admitting deaerated excess fuel from said container, second inlet means for admitting make-up fuel from a lower portion of said fuel tank to replace fuel supplied to said engine, and outlet means for discharging a mixture of said deaerated excess fuel and said make-up fuel into said induction conduit.
Claim 2
Dependent Claim
181 words
A fuel system for an internal combustion engine comprising: a fuel tank; a fuel pump connected to said fuel tank by an induction conduit; a fuel metering assembly associated with said fuel pump for feeding fuel to said engine; a return conduit extending from said fuel metering assembly to said fuel tank to discharge excess fuel thereto; deaeration means included in said return conduit for deaerating said excess fuel, said deaeration means comprising a container positioned in said fuel tank, said container having an upper wall and air discharge means correlated therewith to permit air to flow therethrough; and fuel discharge means to permit make-up fuel from said fuel tank and deaerated excess fuel from said container to flow into said induction conduit, said fuel discharge means including first inlet means for admitting deaerated excess fuel from said container, second inlet means for admitting make-up fuel from a lower portion of said fuel tank to replace fuel supplied to said engine, and outlet means for discharging a mixture of said deaerated excess fuel and said make-up fuel into said induction conduit.
Claim 3
Dependent Claim
17 words
A fuel system, as claimed in claim 1, wherein said air discharge means includes a valve element.
Claim 4
Dependent Claim
42 words
A fuel system, as claimed in claim 2, further wherein said upper wall is perforated and said air discharge means includes a conduit extending through said upper wall, said conduit being arranged to permit air to pass therethrough into said fuel tank.
Claim 5
Dependent Claim
17 words
A fuel system, as claimed in claim 1, further wherein said container includes a self-contained deaeration element.
Claim 6
Dependent Claim
32 words
A fuel system, as claimed in claim 4, further wherein said self-contained deaeration element includes said air discharge means, which has a valving means arranged to discharge air into said fuel tank.
Claim 7
Dependent Claim
17 words
A fuel system, as claimed in claim 5, further wherein said valving means includes a float element.
Claim 8
Dependent Claim
45 words
A fuel system, as claimed in claim 5, further wherein said deaeration element has a perforated lower wall and said fuel discharge means includes a jet nozzle and conduit means arranged in said perforated lower wall to feed deaerated excess fuel to said jet nozzle.
Claim 9
Dependent Claim
37 words
A fuel system, as claimed in claim 6, further wherein said float element of said valving means cooperates with a perforation in a lower wall of said deaeration element to control fuel feed to a jet nozzle.
Claim 10
Dependent Claim
70 words
A fuel system, as claimed in claim 7, which wherein said fuel discharge means further comprises: a funnel-like member having a large open end disposed within said fuel tank and a small opposite end connected to said induction conduit, wherein said jet nozzle projects into said large open end and is spaced from said funnel-like member to define therebetween a fuel passage from said fuel tank to said funnel-like member.
Claim 11
Dependent Claim
30 words
A fuel system, as claimed in claim 1, further wherein said container includes a screen element and said return conduit discharges said excess fuel in proximity to said screen element.
Claim 12
Dependent Claim
47 words
A fuel system, as claimed in claim 10, further wherein said screen element divides said container into several sections comprising an inlet section which is connected with said return conduit and said air discharge means and a discharge section which is connected with said fuel discharge means.
Claim 13
Dependent Claim
28 words
A fuel system, as claimed in claim 11, further wherein said fuel discharge means includes a discharge line connected between said container discharge section and said induction conduit.
Claim 14
Dependent Claim
22 words
A fuel system, as claimed in claim 12, further wherein said discharge line includes a cooling coil disposed within said fuel tank.
Claim 15
Dependent Claim
48 words
A fuel system, as claimed in claim 12, further wherein said fuel discharge means includes fuel passage means, defined by a lower wall portion of said container, for permitting fuel to flow from said fuel tank into said container discharge section, to replace fuel supplied to the engine.
Claim 16
Dependent Claim
18 words
A fuel system, as claimed in claim 14, further wherein said fuel passage means includes a filter element.
Claim 17
Dependent Claim
54 words
A fuel system, as claimed in claim 12, further wherein: said discharge line defines fuel passage means, disposed intermediate the connection of said discharge line with said container discharge section and the connection of said discharge line with said induction conduit, for permitting fuel to flow from said fuel tank into said discharge line.
References Cited (Backward Citations)
US2120779A
Cited
US2878889A
Cited
US3022053A
Cited
US3492793A
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US3699938A
Cited
FR2126610A5
Cited
US3933448A
Cited
US3912468A
Cited
US4159698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |