US3628513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine valve gear lubrication
Assignee: Automobiles Citroen SA
•
Filing: 1970-06-19
•
Granted: 1971-12-21
•
Expires: 1990-06-19
Abstract
Abstract This invention constitutes an improvement in the pressure lubrication of rocker-type valve gears of internal combustion engines, and more particularly in the lubrication of the bearing areas between rocker heels and cams in valve gears comprising at least one overhead camshaft associated with at least one hollow rocker shaft acting as a lubricant supply duct, said rocker shaft being formed with oil-dispensing ports in the form of radial holes coincident with radial holes formed in said rockers themselves in order to form lubricant jets directed towards the working surfaces of said cams in a zone located just upstream of the line of contact between the cams and the corresponding rocker heels.
Inventors
- 👤 Albert Grosseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:14
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01M9/107; F01L; F01L1/00; F01L1/12; F01L1/18; F01L1/181; F16; F16N; F16N7/00; F16N7/14; F16N7/26; F01L2810/00; F01L2810/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
Method of lubricating under pressure rocker-type valve gears of internal combustion engines and more particularly the working zones between the rocker heels and the cams in valve gears comprising at least one camshaft associated with at least one hollow rocker shaft mounted in the cylinder head of the engine and adapted to constitute a lubricant feed duct said rocker shaft being provided with lubricant outlets in the form of radial holes registering with radial holes formed in the rockers themselves in order to form lubricant jets, characterized in that these lubricant jets are directed towards the working surface of each cam at a point located just upstream of the line of contact with the rocker shoe.
Claim 2
Dependent Claim
116 words
Method of lubricating under pressure rocker-type valve gears of internal combustion engines and more particularly the working zones between the rocker heels and the cams in valve gears comprising at least one camshaft associated with at least one hollow rocker shaft mounted in the cylinder head of the engine and adapted to constitute a lubricant feed duct said rocker shaft being provided with lubricant outlets in the form of radial holes registering with radial holes formed in the rockers themselves in order to form lubricant jets, characterized in that these lubricant jets are directed towards the working surface of each cam at a point located just upstream of the line of contact with the rocker shoe.
Claim 3
Dependent Claim
23 words
Method according to claim 1, characterized in that the direction of the lubricant jet is related to the oscillating movement of the rocker.
Claim 4
Dependent Claim
20 words
Method according to claim 1, characterized in that the jet orientation is independent of the oscillating movement of the rocker.
Claim 5
Dependent Claim
13 words
Method according to claim 1, characterized in that said lubricant jet is constant.
Claim 6
Dependent Claim
22 words
Method according to claim 1, characterized in that said lubricant jet is delivered periodically with a timing depending on the camshaft rotation.
Claim 7
Independent Claim
151 words
A device for lubricating the bearing zones between rocker heels and cams in the overhead valve gears of internal combustion engines, which comprises at least one camshaft associated with at least one hollow rocker shaft utilized as a lubricant supply duct, said hollow rocker shaft comprising ports consisting of radial holes coincident with other radial holes formed in the rockers themselves in order to form lubricant jets from the supply of oil under pressure directed through the engine camshaft, characterized in that the axial duct of the rocker shaft and the radial holes of the rockers themselves are so directed that their orientations are coincident in a predetermined angular position such as to direct a lubricant jet issuing therefrom towards the working surfaces of said cams, the lubricant jets impinging against said surfaces in a zone located just upstream of the line of contact between the cam and the rocker heel.
Claim 8
Independent Claim
151 words
A device for lubricating the bearing zones between rocker heels and cams in the overhead valve gears of internal combustion engines, which comprises at least one camshaft associated with at least one hollow rocker shaft utilized as a lubricant supply duct, said hollow rocker shaft comprising ports consisting of radial holes coincident with other radial holes formed in the rockers themselves in order to form lubricant jets from the supply of oil under pressure directed through the engine camshaft, characterized in that the axial duct of the rocker shaft and the radial holes of the rockers themselves are so directed that their orientations are coincident in a predetermined angular position such as to direct a lubricant jet issuing therefrom towards the working surfaces of said cams, the lubricant jets impinging against said surfaces in a zone located just upstream of the line of contact between the cam and the rocker heel.
References Cited (Backward Citations)
FR549594A
Cited
GB223393A
Cited
FR611328A
Cited
GB280982A
Cited
US1864314A
Cited
US2209480A
Cited
US2562404A
Cited
US2525791A
Cited
US2563699A
Cited
US3116647A
Cited
US3008544A
Cited
US3314404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |