US3830206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual throttle valve control for internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1973-05-29
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Granted: 1974-08-20
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Expires: 1993-05-29
Abstract
Abstract A dual throttle valve control for an internal combustion engine of the type having a main combustion chamber supplied with a lean mixture and an auxiliary combustion chamber supplied with a rich mixture. A spark plug ignites the rich mixture in the auxiliary chamber and the resulting blast of flame passes through a torch nozzle to ignite the lean mixture in the main chamber. Two carburetor throttle valves are interconnected for dependent action through a dashpot, cam and cam follower comprising the dual control to regulate the relative amounts of air-fuel mixture admitted to each chamber as the engine load varies from idling to full throttle. Slow opening of the main throttle valve causes corresponding movement of the auxiliary valve, while abrupt opening of the main throttle valve causes the auxiliary throttle valve to open widely and then assume the opening determined by the cam and cam follower.
Inventors
- 👤 U Asaka
- 👤 Y Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:52
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/10; F02B19/1019; F02B19/1023; F02B19/1028; F02B19/1052; F02M; F02M13/00; F02M13/02; F02M13/04; F02M13/046; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A dual throttle valve control for use in an internal combustion engine of the type having a main combustion chamber, an auxiliary combustion chamber and a torch nozzle establishing communication therebetween, said valve control comprising means including a first throttle valve for supplying a lean mixture to the main combustion chamber means including a second throttle valve for supplying a rich mixture to the auxiliary combustion chamber, a cam carried by said first throttle valve, a cam follower carried by said second throttle valve, biasing means urging said cam follower against said cam, and means for opening said second throttle valve beyond a position determined by said cam upon said first throttle valve being abruptly opened.
Claim 2
Dependent Claim
116 words
A dual throttle valve control for use in an internal combustion engine of the type having a main combustion chamber, an auxiliary combustion chamber and a torch nozzle establishing communication therebetween, said valve control comprising means including a first throttle valve for supplying a lean mixture to the main combustion chamber means including a second throttle valve for supplying a rich mixture to the auxiliary combustion chamber, a cam carried by said first throttle valve, a cam follower carried by said second throttle valve, biasing means urging said cam follower against said cam, and means for opening said second throttle valve beyond a position determined by said cam upon said first throttle valve being abruptly opened.
Claim 3
Dependent Claim
34 words
The combination of claim 1 wherein the latter said means controls the return of said cam follower to engagement with said cam, said means being pivotally secured to said cam and said cam follower.
Claim 4
Dependent Claim
88 words
The combination of claim 1 wherein the latter said means comprises a dashpot, said dashpot having a diaphragm therein, said diaphragm carrying a first rod and extending across the interior of said dashpot defining an upper and lower chamber therein, said rod being pivotally secured to said cam follower, a second rod carried by said dashpot and pivotally secured at the extended end thereof to said cam, means defining an air entry for said lower chamber and a check valve allowing air flow therethrough from said lower chamber.
Claim 5
Dependent Claim
179 words
In an internal combustion piston engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch nozzle, and having a main intake passage for supplying a lean mixture to said main chamber, and an auxiliary intake passage for supplying a rich mixture to said auxiliary chamber, the improvement comprIsing, in combination: a main throttle valve in the main intake passage, an auxiliary throttle valve in the auxiliary intake passage, means for turning said main throttle valve toward open position, means for coordinating the movement of the auxiliary throttle valve with the movement of the main throttle valve to maintain a predetermined relationship, the latter said means including a dashpot device having an expansible chamber connected to a restricted orifice, whereby fluid passes between said expansible chamber and the orifice when the main throttle valve is opened slowly to maintain said predetermined relationship, and whereby abrupt opening movement of the main throttle valve allows insufficient time for such fluid flow and thereby causes opening movement of the auxiliary throttle valve in excess of said predetermined relationship.
Claim 6
Dependent Claim
179 words
In an internal combustion piston engine having a main combustion chamber and an auxiliary combustion chamber connected by a torch nozzle, and having a main intake passage for supplying a lean mixture to said main chamber, and an auxiliary intake passage for supplying a rich mixture to said auxiliary chamber, the improvement comprIsing, in combination: a main throttle valve in the main intake passage, an auxiliary throttle valve in the auxiliary intake passage, means for turning said main throttle valve toward open position, means for coordinating the movement of the auxiliary throttle valve with the movement of the main throttle valve to maintain a predetermined relationship, the latter said means including a dashpot device having an expansible chamber connected to a restricted orifice, whereby fluid passes between said expansible chamber and the orifice when the main throttle valve is opened slowly to maintain said predetermined relationship, and whereby abrupt opening movement of the main throttle valve allows insufficient time for such fluid flow and thereby causes opening movement of the auxiliary throttle valve in excess of said predetermined relationship.
Claim 7
Dependent Claim
32 words
The combination set forth in claim 4 wherein the coordinating means comprises a cam fixed relative to the main throttle valve and a cooperating follower fixed relative to the auxiliary throttle valve.
Claim 8
Dependent Claim
26 words
The combination set forth in claim 4 in which atmospheric air enters the expansible chamber through said orifice when the main throttle valve is opened slowly.
Claim 9
Dependent Claim
19 words
The combination set forth in claim 4 in which one wall of said expansible chamber comprises a flexible diaphragm.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |