Patent US2902865A successfully refreshed from Google Patents.
Patent US4622940A successfully refreshed from Google Patents.
US4622940A
Expired / Lapsed
US
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Porting arrangement for internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1985-03-14
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Granted: 1986-11-18
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Expires: 2005-03-14
Abstract
Abstract A porting and valve arrangement for an internal combustion engine embodying three valves serving the same chamber. Separate passages extend from each of the valves and merge into a common symmetrical portion for facilitating good distribution and cooperation with an associated manifold or the like.
Inventors
- 👤 Masaaki Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:20
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10091; F02M35/10098; F01; F01L; F01L1/00; F01L1/26; F01L1/265; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F02M35/10006; F02M35/10072; F02M35/10118; F02M35/10124; F02M35/104; F02M35/108; F02M35/1085; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245; F02M35/1045
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A valve and porting arrangement for the combustion chamber of a four-cycle internal combustion engine having at least three separate valve seats communicating with said combustion chamber, valve means for controlling the flow through said valve seats, and at least three passages extending separately from respective of said valve seats, said passages merging smoothly into a single passage extending to and having only a single inlet opening formed on an outer face of the component of the engine in which said passages are formed, said single passages having a generally symmetrical, non-circular configuration.
Claim 2
Dependent Claim
93 words
A valve and porting arrangement for the combustion chamber of a four-cycle internal combustion engine having at least three separate valve seats communicating with said combustion chamber, valve means for controlling the flow through said valve seats, and at least three passages extending separately from respective of said valve seats, said passages merging smoothly into a single passage extending to and having only a single inlet opening formed on an outer face of the component of the engine in which said passages are formed, said single passages having a generally symmetrical, non-circular configuration.
Claim 3
Dependent Claim
21 words
A valve and porting arrangement as set forth in claim 1 wherein the component of the engine comprises a cylinder head.
Claim 4
Dependent Claim
23 words
A valve and porting arrangement as set forth in claim 2 wherein the individual portions of the passages have generally circular cross-sectional configurations.
Claim 5
Dependent Claim
24 words
A valve and porting arrangement as set forth in claim 3 wherein the single passage has a cross-sectional configuration of a three leafed clover.
References Cited (Backward Citations)
US3408992A
Cited
JPS5718553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |