Patent US3722487A successfully refreshed from Google Patents.
US3722487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for compensation of the operation of a fuel injection device for an internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1971-11-03
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Granted: 1973-03-27
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Expires: 1991-11-03
Abstract
Abstract A fuel injection device for an internal combustion engine is subjected to the action of two spring units mounted in a suction chamber connected to the suction inlet leading to the engine such that the first spring unit becomes inoperative when the engine is under high load while the resilient action of the second spring unit varies with atmospheric pressure change. The suction chamber has front and rear diaphragm walls against which the second spring unit permanently bears, whereas the first spring unit is fixedly supported at its back end while its front end bears against the front wall when the suction pressure is high during low engine load and loses contact therewith when the suction pressure is low during high engine load. At the back of the suction chamber is a further chamber acting on the rear diaphragm wall and selectively connected by a changeover valve to the atmosphere or to the suction inlet depending on atmospheric pressure.
Inventors
- 👤 Y Ohama
- 👤 H Kogure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:31
CPC Classifications
F; F02; F02D; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0261; F02D2700/0266
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
Apparatus for the compensation of the operation of a fuel injection device for an internal combustion engine, the fuel injection device being operated by the negative pressure in a suction inlet to the engine, said apparatus comprising means responsive to the negative pressure in the inlet and acting on the fuel injection device to regulate the amount of fuel in injection to the engine, and means responsive to atmospheric pressure and coupled to the first said means to control the action thereof on the fuel injection device, the first said means comprising first and second spring assemblies applying resilient action to the fuel injection device and subjected to negative pressure in the engine such that the first spring assembly is rendered inoperative when the engine is under high load, said second spring assembly being acted on by the second said means to undergo variation in its resilient action on the fuel injection device upon variation in atmospheric pressure whereby under high load only the second spring assembly acts on the fuel injection device and variation in atmospheric pressure has pronounced effect on the fuel injection device whereas under low load both spring assemblies act on the fuel injection device and the effect of the variation in atmospheric pressure is minimized.
Claim 2
Dependent Claim
210 words
Apparatus for the compensation of the operation of a fuel injection device for an internal combustion engine, the fuel injection device being operated by the negative pressure in a suction inlet to the engine, said apparatus comprising means responsive to the negative pressure in the inlet and acting on the fuel injection device to regulate the amount of fuel in injection to the engine, and means responsive to atmospheric pressure and coupled to the first said means to control the action thereof on the fuel injection device, the first said means comprising first and second spring assemblies applying resilient action to the fuel injection device and subjected to negative pressure in the engine such that the first spring assembly is rendered inoperative when the engine is under high load, said second spring assembly being acted on by the second said means to undergo variation in its resilient action on the fuel injection device upon variation in atmospheric pressure whereby under high load only the second spring assembly acts on the fuel injection device and variation in atmospheric pressure has pronounced effect on the fuel injection device whereas under low load both spring assemblies act on the fuel injection device and the effect of the variation in atmospheric pressure is minimized.
Claim 3
Dependent Claim
99 words
Apparatus as claimed in claim 1 wherein the first said means comprises a suction chamber connected to the suction inlet to the engine, said suction chamber including a front diaphragm wall coupled to the fuel injection device, said first and second spring assemblies being in said suction chamber, said first spring assembly engaging said diaphragm wall when the suction pressure in the inlet is high during low engine load and being disengaged from said wall when the suction pressure in the inlet is low during high engine load, said second spring assembly being in permanent engagement with said wall.
Claim 4
Dependent Claim
15 words
Apparatus as claimed in claim 2 wherein said first spring assembly comprises two spring members.
Claim 5
Dependent Claim
23 words
Apparatus as claimed in claim 2 wherein said suction chamber includes a rear diaphragm wall against which the second spring assembly is engaged.
Claim 6
Dependent Claim
60 words
Apparatus as claimed in claim 4 wherein said means responsive to atmospheric pressure to control the action of the first means on the fuel injection device comprises a second suction chamber behind said rear diaphragm wall, and means responsive to atmospheric pressure for selectively supplying atmospheric pressure or the suction pressure at the engine inlet to said second suction chamber.
Claim 7
Dependent Claim
44 words
Apparatus as claimed in claim 3 wherein said spring members have fixed back ends and free front ends which bear against said front diaphragm wall when the suction pressure in the inlet is high and lose contact therewith when the suction pressure is low.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |