US4565168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve control device, particularly for valves of internal combustion engines
Assignee: Renault SA
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Filing: 1984-01-26
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Granted: 1986-01-21
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Expires: 2004-01-26
Abstract
Abstract A valve control device of the type having a rotating cam and a cam drive to communicate to a valve a reciprocating lifting movement in opposition to the closing force exerted by a return spring. The sliding surface of the cam drive comes in contact with the cam while immersed in an independent bath of lubricating oil having a high viscosity. Application is to a distribution device with reduced friction for internal combustion engines.
Inventors
- 👤 Jean-Pierre Rivere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:56
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01M9/106; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F02; F02B; F02B77/00; F02B77/11; F01L2810/00; F01L2810/02; F02B2275/00; F02B2275/20; F02F; F02F7/00; F02F7/006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A valve control device for an overhead camshaft engine having a cylinder head including at least one rotatable cam on a camshaft and at least one valve, said valve control device comprising: valve drive means extending between one said cam and one said valve for transferring rotational movement of said cam into reciprocal movement of said valve in an opening direction; return spring means associated with each said valve for biasing said valve in a closing direction; an isolated and independent bath of high viscosity lubricating oil in said cylinder head, wherein said valve drive means includes a sliding surface slidingly contacting each said cam, each said sliding surface being immersed in said bath; and means for circulating said oil only within said cylinder head, whereby said high viscosity lubricating oil in said isolated and independent bath in said cylinder head does not communicate with oil outside of said bath.
Claim 2
Dependent Claim
150 words
A valve control device for an overhead camshaft engine having a cylinder head including at least one rotatable cam on a camshaft and at least one valve, said valve control device comprising: valve drive means extending between one said cam and one said valve for transferring rotational movement of said cam into reciprocal movement of said valve in an opening direction; return spring means associated with each said valve for biasing said valve in a closing direction; an isolated and independent bath of high viscosity lubricating oil in said cylinder head, wherein said valve drive means includes a sliding surface slidingly contacting each said cam, each said sliding surface being immersed in said bath; and means for circulating said oil only within said cylinder head, whereby said high viscosity lubricating oil in said isolated and independent bath in said cylinder head does not communicate with oil outside of said bath.
Claim 3
Dependent Claim
21 words
The valve control device of claim 1, wherein said bath of lubricating oil exhibits a viscosity of 200 to 1000 centipoises.
Claim 4
Dependent Claim
65 words
The valve control device of claim 1 wherein said valve drive means comprises: a rocker arm shaft; a rocker arm pivotable about said rocker arm shaft at a bearing surface; and grooves on said rocker arm, said grooves extending on said bearing surface and onto a surface of said rocker arm which is immersed in said bath, whereby said oil bath lubricates said bearing surface.
Claim 5
Dependent Claim
33 words
The valve control device of claim 1 wherein said oil bath comprises an upper bath and a lower bath and wherein said valve drive means comprises a lifter immersed in said upper bath.
Claim 6
Dependent Claim
88 words
The control device of claim 4 including means for feeding oil from said lower bath to said upper bath, said means for feeding comprising: a bore in said camshaft; a low pressure pump having an inlet in communication with said lower bath; first conduit means feeding oil from said pump to said camshaft; second conduit means feeding said oil from said first conduit means to said bore in said camshaft; and third conduit means communicating said bore in said camshaft with a bearing surface of each said cam.
Claim 7
Dependent Claim
20 words
The valve control device of claim 1 including a thermally insulating material separating said oil bath from said cylinder head.
Claim 8
Dependent Claim
23 words
The valve control device of claim 1 wherein said valve is mounted in said cylinder head via a guide including an oil seal.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |