US3916847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake and exhaust system for three valve internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1973-06-27
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Granted: 1975-11-04
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Expires: 1993-06-27
Abstract
Abstract A three valve internal combustion engine has an auxiliary combustion chamber connected to a main combustion chamber through a torch opening, and a spark plug ignites a rich combustible mixture in the auxiliary chamber to project a flame through the torch opening to ignite a relatively lean mixture in the main combustion chamber. To prevent condensation of fuel in the intake passage to the auxiliary combustion chamber, especially under start-up conditions, the rich combustible mixture is passed in heat exchange relationship with exhaust gasses from the main combustion chamber. Thin wall metallic conduits carrying the rich combustible mixture to the auxiliary chamber and carrying exhaust gasses from the main chamber are placed in integral contact and are enclosed within a relatively thick wall protective shell.
Inventors
- 👤 Soichi Nakano
- 👤 Eiji Taguchi
- 👤 Yoshitoku Iizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:52
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02M31/08; F02M31/087; F02B; F02B19/00; F02B19/10; F02B19/1019; F02B19/1023; F02B19/1028; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
In an internal combustion engine having valved intake and exhaust passages communicating with a main combustion chamber, and having a valved intake passage communicating with an auxiliary combustion chamber, the chambers communicating through a torch opening, the passages and opening being positioned within a cylinder head of the engine, and a spark plug positioned to ignite a combustible mixture in the auxiliary chamber, the improvement comprising, in combination: means including a first thin wall metallic conduit extending laterally to the cylinder head for supplying a combustible mixture to the valved intake passage to the auxiliary chamber, means including a second thin wall metallic conduit extending laterally from the cylinder head for receiving exhaust gasses from the valved exhaust passage, and means laterally spaced from the cylinder head connecting at least a portion of said thin wall metallic conduits in heat exchange relationship so that the combustible mixture in said first conduit is heated by exhaust gasses in said second conduit, and means including a protective shell of relatively thick walls surrounding and structurally supporting said conduits, and extending for the full lengths thereof.
Claim 2
Dependent Claim
183 words
In an internal combustion engine having valved intake and exhaust passages communicating with a main combustion chamber, and having a valved intake passage communicating with an auxiliary combustion chamber, the chambers communicating through a torch opening, the passages and opening being positioned within a cylinder head of the engine, and a spark plug positioned to ignite a combustible mixture in the auxiliary chamber, the improvement comprising, in combination: means including a first thin wall metallic conduit extending laterally to the cylinder head for supplying a combustible mixture to the valved intake passage to the auxiliary chamber, means including a second thin wall metallic conduit extending laterally from the cylinder head for receiving exhaust gasses from the valved exhaust passage, and means laterally spaced from the cylinder head connecting at least a portion of said thin wall metallic conduits in heat exchange relationship so that the combustible mixture in said first conduit is heated by exhaust gasses in said second conduit, and means including a protective shell of relatively thick walls surrounding and structurally supporting said conduits, and extending for the full lengths thereof.
Claim 3
Dependent Claim
21 words
The combination set forth in claim 1 in which at least a portion of said thin wall conduits are joined integrally.
Claim 4
Dependent Claim
226 words
In an internal combustion engine having a main combustion chamber provided with a wall thereof defined by a movable piston and having an auxiliary combustion chamber communicating through a torch opening with the main combustion chamber, the main chamber having a valved intake passage and a valved exhaust passage, the auxiliary chamber having a valved intake passage, the passages and opening being positioned within a cylinder head of the engine, and a spark plug associated with the auxiliary chamber, the improvement comprising, in combination: means including a first thin wall metallic conduit extending laterally to the cylinder head for supplying a relatively rich combustible mixture to the valved intake passage to the auxiliary chamber, means including a seconD thin wall metallic conduit extending laterally from the cylinder head for receiving exhaust gasses from the valved exhaust passage, means including a third conduit for supplying a relatively lean combustible mixture to the valved intake passage to the main chamber, and means laterally spaced from the cylinder head connecting at least a portion of said first and second conduits in heat exchange relationship so that the relatively rich combustible mixture in said first conduit is heated by exhaust gasses in said second conduit, and means including a protective shell of relatively thick walls surrounding and structurally supporting said thin wall conduits, and extending for the full lengths thereof.
Claim 5
Dependent Claim
226 words
In an internal combustion engine having a main combustion chamber provided with a wall thereof defined by a movable piston and having an auxiliary combustion chamber communicating through a torch opening with the main combustion chamber, the main chamber having a valved intake passage and a valved exhaust passage, the auxiliary chamber having a valved intake passage, the passages and opening being positioned within a cylinder head of the engine, and a spark plug associated with the auxiliary chamber, the improvement comprising, in combination: means including a first thin wall metallic conduit extending laterally to the cylinder head for supplying a relatively rich combustible mixture to the valved intake passage to the auxiliary chamber, means including a seconD thin wall metallic conduit extending laterally from the cylinder head for receiving exhaust gasses from the valved exhaust passage, means including a third conduit for supplying a relatively lean combustible mixture to the valved intake passage to the main chamber, and means laterally spaced from the cylinder head connecting at least a portion of said first and second conduits in heat exchange relationship so that the relatively rich combustible mixture in said first conduit is heated by exhaust gasses in said second conduit, and means including a protective shell of relatively thick walls surrounding and structurally supporting said thin wall conduits, and extending for the full lengths thereof.
Claim 6
Dependent Claim
21 words
The combination set forth in claim 3 in which at least a portion of said thin wall conduits are joined integrally.
Claim 7
Dependent Claim
17 words
The combination set forth in claim 3 in which said protective shell comprises a rigid cast structure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |