US4638774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve actuating mechanism for internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1985-06-11
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Granted: 1987-01-27
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Expires: 2005-06-11
Abstract
Abstract A valve actuating mechanism for an internal combustion engine that permits the use of a plurality of valves per combustion chamber. There are a greater number of intake valves than exhaust valves and the intake valves are actuated by means of a single rocker arm associated with a first cam shaft. The exhaust valves are individually and directly operated by a second camshaft.
Inventors
- 👤 Kazuo Aoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:28
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/26; F01L1/265; F01L1/12; F01L1/18; F01L1/185; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
In an internal combustion engine having a cylinder head defining at least in part with a cylinder bore a combustion chamber, a set of a plurality of intake valves supported by said cylinder head at one side of a plane containing the axis of said cylinder bore for controlling the flow of an intake charge into said combustion chamber, a set of a plurality of exhaust valves supported by said cylinder head at the other side of said plane for controlling the flow of the exhaust charge from the combustion chamber, first and second cam means disposed on opposite sides of said plane, means for directly operating the valves of one of said sets from said first cam means, and rocker arm means for operating the valves of the other set from said second cam means.
Claim 2
Dependent Claim
136 words
In an internal combustion engine having a cylinder head defining at least in part with a cylinder bore a combustion chamber, a set of a plurality of intake valves supported by said cylinder head at one side of a plane containing the axis of said cylinder bore for controlling the flow of an intake charge into said combustion chamber, a set of a plurality of exhaust valves supported by said cylinder head at the other side of said plane for controlling the flow of the exhaust charge from the combustion chamber, first and second cam means disposed on opposite sides of said plane, means for directly operating the valves of one of said sets from said first cam means, and rocker arm means for operating the valves of the other set from said second cam means.
Claim 3
Dependent Claim
41 words
In an internal combustion engine as set forth in claim 1 wherein the first cam means comprises a first camshaft associated with the rocker arm means and the second cam means comprises a second camshaft associated with the directly operated valves.
Claim 4
Dependent Claim
43 words
In an internal combustion engine as set forth in claim 2 wherein the rocker arm means comprises a single rocker arm associated with a single cam lobe and having a plurality of finger portions each engaged with a respective one of the valves.
Claim 5
Dependent Claim
30 words
In an internal combustion engine as set forth in claim 1 wherein one of the valve sets has a greater number of valves than the other of the valve sets.
Claim 6
Dependent Claim
37 words
In an internal combustion engine as set forth in claim 4 wherein the set of valves having the greater number is operated by the rocker arm means and the valves of the other set are directly actuated.
Claim 7
Dependent Claim
46 words
In an internal combustion engine as set forth in claim 5 wherein the rocker arm means comprises a single rocker arm engaged with a single cam lobe and having a plurality of finger portions each associated with a respective one of the valves of the set.
References Cited (Backward Citations)
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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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |