Patent US4044730A successfully refreshed from Google Patents.
US4044730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary combustion chamber for an internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1975-11-06
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Granted: 1977-08-30
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Expires: 1995-11-06
Abstract
Abstract An auxiliary combustion chamber at least partially embedded in the cylinder head of an internal combustion engine adjacent the intake valve of a main combustion chamber and having a spark plug positioned in the auxiliary chamber and unvalved inlet and outlet ports interconnecting the auxiliary chamber with the main chamber. The air/fuel mixture drawn into the main combustion chamber is deflected by the back surface of the intake valve into the inlet port of the auxiliary combustion chamber toward the spark plug. The auxiliary combustion chamber may include a shell positioned in a cavity in the cylinder head with devices for properly positioning the shell in the cavity and for retaining the shell and preventing it from rotating. A passage is provided for rich air/fuel mixture terminating at the rear surface of the valve, when closed, with refinements of the passage, shape of the inlet port, and main combustion chamber wall facilitating the flow of the rich mixture into the auxiliary combustion chamber by venturi action. The flow of fresh mixture into the auxiliary combustion chamber through suction scavenges the combustion gas remaining from the prior firing sequence.
Inventors
- 👤 Noguchi Masaaki
- 👤 Tanaka Yukiyasu
- 👤 Sekiya Setsuro
- 👤 Motosugi Katsuhiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:16
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/10; F02B19/1019; F02B19/1023; F02B19/1066; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
215 words
In an internal combustion engine including a main combustion chamber, an air/fuel mixture intake to the main combustion chamber through the cylinder head, an intake valve for controlling the flow of the air/fuel mixture into the main combustion chamber, and a spark plug for igniting the air/fuel mixture, the improvement comprising: an auxiliary combustion chamber including a cavity in the wall of the cylinder head adjacent said air/fuel mixture intake and a shell at least partially lining said cavity and forming a portion of the wall of the said main combustion chamber said shell being integrally cast within the cylinder head for enhancing heat transfer therebetween and said spark plug having its spark gap in the auxiliary combustion chamber; at least one unvalved inlet port in said shell interconnecting the auxiliary combustion chamber and the main chamber for conducting air/fuel mixture into the auxiliary chamber and at least one unvalved outlet port in said shell for conducting residual combustion gas from the auxiliary chamber into the main chamber; means for retaining said shell in said cavity and means for positioning said shell in said cavity; said means for retaining said shell in said cavity including an annular channel formed in the wall of said cavity and a flange formed on the surface of said shell.
Claim 2
Dependent Claim
215 words
In an internal combustion engine including a main combustion chamber, an air/fuel mixture intake to the main combustion chamber through the cylinder head, an intake valve for controlling the flow of the air/fuel mixture into the main combustion chamber, and a spark plug for igniting the air/fuel mixture, the improvement comprising: an auxiliary combustion chamber including a cavity in the wall of the cylinder head adjacent said air/fuel mixture intake and a shell at least partially lining said cavity and forming a portion of the wall of the said main combustion chamber said shell being integrally cast within the cylinder head for enhancing heat transfer therebetween and said spark plug having its spark gap in the auxiliary combustion chamber; at least one unvalved inlet port in said shell interconnecting the auxiliary combustion chamber and the main chamber for conducting air/fuel mixture into the auxiliary chamber and at least one unvalved outlet port in said shell for conducting residual combustion gas from the auxiliary chamber into the main chamber; means for retaining said shell in said cavity and means for positioning said shell in said cavity; said means for retaining said shell in said cavity including an annular channel formed in the wall of said cavity and a flange formed on the surface of said shell.
Claim 3
Dependent Claim
41 words
The improvement of claim 1 wherein said means for positioning said shell includes a flattened portion in said flange and a complementary abutment in said annular channel and wherein said positioning means also prevent rotation of said shell in said cavity.
Claim 4
Dependent Claim
52 words
The improvement of claim 1 wherein said shell includes a domed portion forming a portion of the wall of said main combustion chamber and wherein said inlet port is formed in the side of said domed portion and opens into said main combustion chamber in the direction of said air/fuel mixture intake.
Claim 5
Dependent Claim
26 words
The improvement of claim 3 wherein said shell is eccentrically positioned in said cylinder head with respect to the longitudinal axis of said main combustion chamber.
Claim 6
Dependent Claim
28 words
The improvement of claim 4 wherein said cavity is substantially a right circular cylinder and wherein said spark plug is axially aligned with respect to said cylindrical cavity.
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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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |