Patent US4774912A successfully refreshed from Google Patents.
US4774912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite cylinder head of internal-combustion engine
Assignee: Kawasaki Motors Ltd
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Filing: 1986-09-30
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Granted: 1988-10-04
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Expires: 2006-09-30
Abstract
Abstract A composite cylinder head of an internal-combustion engine includes a bottom wall part to face the combustion chamber and a reinforcement part disposed on the side of the bottom wall part opposite to the combustion chamber and functioning as a back-up reinforcement of the bottom wall part. The two parts of the cylinder head are joined into a single integral structure. The bottom wall part is formed from a metal of higher high-temperature strength and lower thermal conductivity than those of the material of the reinforcement part. This cylinder head makes possible the use of a higher maximum pressure within the cylinder than that in the case of a conventional cylinder head.
Inventors
- 👤 Hideaki Nakano
- 👤 Yoichi Nakamura
- 👤 Tadahiro Ozu
- 👤 Toshio Atsuta
- 👤 Takeshi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:09
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F7/00; F02F7/0085; F02B; F02B2275/00; F02B2275/14; F02B3/00; F02B3/06; F02F2001/008; F02F2001/244; F02F2001/247; F02F2001/249
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A cylinder head of an internal-combustion engine having a combustion chamber, said cylinder head comprising: a reinforcement part having a planar bottom surface and internal cooling water passages formed so as to open along said bottom surface toward the combustion chamber; a thin bottom wall part separate from said reinforcement part and formed in the shape of an entirely flat plate having upper and lower surfaces defined entirely as parallel upper and lower planar surfaces; and said bottom wall part being joined face-to-face at said upper planar surface thereof to said planar bottom surface of said reinforcement part by a face-joining method such that said cooling water passages are closed by said upper surface, and with the lower planar surface of the bottom all part directed away from said reinforcement part to face the combustion chamber.
Claim 2
Dependent Claim
136 words
A cylinder head of an internal-combustion engine having a combustion chamber, said cylinder head comprising: a reinforcement part having a planar bottom surface and internal cooling water passages formed so as to open along said bottom surface toward the combustion chamber; a thin bottom wall part separate from said reinforcement part and formed in the shape of an entirely flat plate having upper and lower surfaces defined entirely as parallel upper and lower planar surfaces; and said bottom wall part being joined face-to-face at said upper planar surface thereof to said planar bottom surface of said reinforcement part by a face-joining method such that said cooling water passages are closed by said upper surface, and with the lower planar surface of the bottom all part directed away from said reinforcement part to face the combustion chamber.
Claim 3
Dependent Claim
23 words
A cylinder head according to claim 1 wherein the bottom wall part and the reinforcement part are respectively formed from mutually different materials.
Claim 4
Dependent Claim
55 words
A cylinder head according to claim 2 wherein the bottom wall part is formed from a material of higher high-temperature strength and lower thermal conductivity than those of the material of the reinforcement part thereby making it possible to increase the mechanical and thermal strengths and to reduce the thickness of said bottom wall part.
Claim 5
Dependent Claim
18 words
A cylinder head according to claim 3 wherein the bottom wall part is formed from a nickel alloy.
Claim 6
Dependent Claim
19 words
A cylinder head according to claim 3 wherein the bottom wall part is formed from an austenitic stainless steel.
Claim 7
Dependent Claim
19 words
A cylinder head according to claim 3 wherein the bottom wall part is formed from a martensitic stainless steel.
Claim 8
Dependent Claim
17 words
A cylinder head according to claim 3 wherein the reinforcement part is made of a cast steel.
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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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |