US3786795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinder head
Assignee: Toyota Motor Corp
•
Filing: 1972-11-14
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Granted: 1974-01-22
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Expires: 1992-11-14
Abstract
Abstract The present invention relates to an improvement in the internal combustion engine, particularly, internal combustion engines for automobiles. More specifically it relates to an improved cylinder head characterized by having the total area of the internal wall of the exhaust port constructed in two-piece fashion, one piece or part being a refractory part solidly enveloped with the other part which is the engine casting. The refractory part is shrinkfitted in the molten metal of the casting so that it can fully withstand repeated cycles of heating and cooling as well as mechanical vibrations.
Inventors
- 👤 Y Okada
- 👤 Y Kaneko
- 👤 Y Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:50
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/26; F02F1/36; F02F1/38; F02B; F02B77/00; F02B77/02; F02B1/00; F02B1/02; F02B1/04; F02F2001/244; F02F2001/245; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2201/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
In a cylinder head of an internal combustion engine, the improvement comprising a cylinder head wherein the inner wall of the exhaust port of the head includes a prefabricated refractory insert in intimate engagement with the metal cylinder casting and around which the metal cylinder is cast whereby the refractory insert is under the compression of the surrounding metal.
Claim 2
Dependent Claim
59 words
In a cylinder head of an internal combustion engine, the improvement comprising a cylinder head wherein the inner wall of the exhaust port of the head includes a prefabricated refractory insert in intimate engagement with the metal cylinder casting and around which the metal cylinder is cast whereby the refractory insert is under the compression of the surrounding metal.
Claim 3
Dependent Claim
19 words
The combination of claim 1 in which the refractory preform is fabricated from molten silica, high alumina or alumina-silica.
References Cited (Backward Citations)
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US1755578A
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US1812870A
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US2075388A
Cited
US2154717A
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GB665330A
Cited
US3408995A
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |