US4617883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivot members for a cam follower of valve mechanism for internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1985-09-27
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Granted: 1986-10-21
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Expires: 2005-09-27
Abstract
Abstract The curved surface of the semi-spherical recess is defined such that a center of the curvature of the semi-spherical recess in a longitudinal section including a center line of the semi-spherical recess deviates from the center line, and a radius of curvature of the recess is greater than a radius of curvature of the spherical fitting portion.
Inventors
- 👤 Takahiro Okuyama
- 👤 Susumu Toki
- 👤 Masahito Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:40
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/18; F01L1/185; F01L1/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
In a valve mechanism for an internal combustion engine of the type in which a semi-spherical recess is formed on either one of a pivot member disposed on an engine main body and a base end of a cam follower interposed between a cam and a valve of the engine and a spherical fitting portion to fit to said semi-spherical recess is disposed at the other of said pivot member and the base end of said cam follower, the improvement wherein a curved surface of said semi-spherical recess is defined such that a center of curvature of said semi-spherical recess in a longitudinal section including a center line of said semi-spherical recess deviates from said center line, and a radius of curvature of said recess is greater than a radius of curvature of said spherical fitting portion.
Claim 2
Dependent Claim
137 words
In a valve mechanism for an internal combustion engine of the type in which a semi-spherical recess is formed on either one of a pivot member disposed on an engine main body and a base end of a cam follower interposed between a cam and a valve of the engine and a spherical fitting portion to fit to said semi-spherical recess is disposed at the other of said pivot member and the base end of said cam follower, the improvement wherein a curved surface of said semi-spherical recess is defined such that a center of curvature of said semi-spherical recess in a longitudinal section including a center line of said semi-spherical recess deviates from said center line, and a radius of curvature of said recess is greater than a radius of curvature of said spherical fitting portion.
Claim 3
Dependent Claim
50 words
The valve mechanism for an internal combustion engine as defined in claim 1 wherein the radius of curvature of said semi-spherical recess is determined such that a contact point of said spherical fitting portion with said semi-spherical recess is positioned substantially at half of the depth of said semi-spherical recess.
Claim 4
Dependent Claim
84 words
The valve mechanism for an internal combustion engine as defined in claim 1, wherein the radius of curvature of the semi-spherical recess is determined such that a center angle between a plane passing through a center of curvature of said spherical fitting portion and crossing said center line of said recess at right angles and a line connecting a contact point between said spherical fitting portion and said recess with said center of curvature of said spherical fitting portion is from 20° to 45°.
Claim 5
Dependent Claim
20 words
The valve mechanism for an internal combustion engine as defined in claim 3, wherein said center angle is approximately 30°.
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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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |