Patent US5255643A successfully refreshed from Google Patents.
US5255643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection pump drive for engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1992-11-06
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Granted: 1993-10-26
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Expires: 2012-11-06
Abstract
Abstract A fuel injection system for an internal combustion engine having a fuel pump drive for driving a fuel pump of the injection system at different speed ratios depending upon the engine conditions. The pump is driven at a higher speed during starting than when the engine is operating.
Inventors
- 👤 Norihisa Mochizuki
- 👤 Toshio Kinoshita
- 👤 Takeshi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:02
CPC Classifications
F; F02; F02B; F02B67/00; F02B67/04; F02M; F02M37/00; F02M37/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B61/00; F02B61/02; F02B63/00; F02B63/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A fuel injection system for an internal combustion engine comprising starter means for starting said engine, a fuel/air injector, a fuel pump for supplying fuel under pressure to said fuel/air injector, an air pump for supplying air to said fuel/air injector, and drive means for driving said fuel pump and said air pump from said engine, said drive means for driving one of said pumps from said engine being effective for driving said pump at a first high speed ratio during operation of said starter means and at a different lower speed ratio during running of said engine and when said starter means is not being driven, said drive means for the other of said pumps driving said other pump at a constant speed ratio.
Claim 2
Dependent Claim
125 words
A fuel injection system for an internal combustion engine comprising starter means for starting said engine, a fuel/air injector, a fuel pump for supplying fuel under pressure to said fuel/air injector, an air pump for supplying air to said fuel/air injector, and drive means for driving said fuel pump and said air pump from said engine, said drive means for driving one of said pumps from said engine being effective for driving said pump at a first high speed ratio during operation of said starter means and at a different lower speed ratio during running of said engine and when said starter means is not being driven, said drive means for the other of said pumps driving said other pump at a constant speed ratio.
Claim 3
Dependent Claim
42 words
A fuel injection system for an internal combustion engine as recited in claim 1 wherein one of the speed ratios provides a substantially higher rate of speed of the fuel pump in relation to the engine speed than the other speed ratio.
Claim 4
Dependent Claim
26 words
A fuel injection system for an internal combustion engine as recited in claim 1 further including means for shifting the drive means between the speed ratios.
Claim 5
Dependent Claim
26 words
A fuel injection system for an internal combustion engine as recited in claim 1 wherein the pump driven at different speed ratios comprises the fuel pump.
Claim 6
Dependent Claim
42 words
A fuel injection system for an internal combustion engine as recited in claim 4 wherein one of the speed ratios provides a substantially higher rate of speed of the fuel pump in relation to the engine speed than the other speed ratio.
Claim 7
Dependent Claim
26 words
A fuel injection system for an internal combustion engine as recited in claim 5 further including means for shifting the drive means between the speed ratios.
Claim 8
Dependent Claim
53 words
A fuel injection system for an internal combustion engine as set forth in claim 2 wherein there are further provided regulators means for regulating the pressure of fuel supplied to the fuel/air injector by the fuel pump in relation to the pressure of air supplied to the fuel/air injector by the air pump.
Claim 9
Dependent Claim
53 words
A fuel injection system for an internal combustion engine as set forth in claim 5 wherein there are further provided regulators means for regulating the pressure of fuel supplied to the fuel/air injector by the fuel pump in relation to the pressure of air supplied to the fuel/air injector by the air pump.
References Cited (Backward Citations)
US3455105A
Cited
US3363614A
Cited
US3690768A
Cited
US3577965A
Cited
US4117821A
Cited
US4411237A
Cited
US4295798A
Cited
US4453522A
Cited
US4421076A
Cited
US4586468A
Cited
US4756293A
Cited
US4867115A
Cited
US4936279A
Cited
GB2222435A
Cited
US4899714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |