Patent US4637356A successfully refreshed from Google Patents.
US4637356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve actuating mechanism for internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1985-06-19
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Granted: 1987-01-20
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Expires: 2005-06-19
Abstract
Abstract An improved valve actuating mechanism for an internal combustion engine for operating three closely adjacent valves from three lobes of the same camshaft. The centermost lobe operates its valve through a rocker arm while the outermost lobes directly operate their associated valves.
Inventors
- 👤 Yuuzoh Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:35
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F01; F01L; F01L1/00; F01L1/26; F01L1/265; F02B; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
An internal combustion engine comprising a cylinder having a bore, a cylinder head fixed relative to said cylinder, three poppet type valves supported by said cylinder head for reciprocation about respective axes all positioned on the same side of a plane containing the axis of said cylinder bore, a single camshaft having three respective cam lobes each associated with a respective of said valves, said camshaft being rotatable about an axis extending parallel to said plane and lying on said same side thereof as said valve axes, rocker arms means associated with one of the cam lobes for operating its associated valve, and means for directly operating the remainder of said valves from the remaining cam lobes.
Claim 2
Dependent Claim
117 words
An internal combustion engine comprising a cylinder having a bore, a cylinder head fixed relative to said cylinder, three poppet type valves supported by said cylinder head for reciprocation about respective axes all positioned on the same side of a plane containing the axis of said cylinder bore, a single camshaft having three respective cam lobes each associated with a respective of said valves, said camshaft being rotatable about an axis extending parallel to said plane and lying on said same side thereof as said valve axes, rocker arms means associated with one of the cam lobes for operating its associated valve, and means for directly operating the remainder of said valves from the remaining cam lobes.
Claim 3
Dependent Claim
18 words
An internal combustion engine as set forth in claim 1 wherein the valves all serve the same function.
Claim 4
Dependent Claim
50 words
An internal combustion engine as set forth in claim 1 wherein the centermost valve is operated by the centermost cam lobe via the rocker arm means and the remainder of the valves are operated directly from the remaining cam lobes by means of followers slidably supported in the cylinder head.
Claim 5
Dependent Claim
39 words
An internal combustion engine as set forth in claim 1 wherein the rocker arm is supported for pivotal movement about an axis parallel to the plane and offset from the plane away from the rotational axis of the camshaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |