US4124011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for preventing outflow of oil from an oil filler port
Assignee: Toyota Motor Corp
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Filing: 1977-07-05
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Granted: 1978-11-07
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Expires: 1997-07-05
Abstract
Abstract A system for preventing outflow of oil from an oil filler port of an overhead camshaft engine. The system comprises a partition wall extending downwardly from a cylinder head cover to divide the interior thereof into a timing chain chamber having a timing chain gear and a timing chain and a valve chamber having the oil filler port, a cam shaft and intake and exhaust valves. The partition wall prevents lubricating oil splashed in the timing chain chamber by rotation of the timing chain from getting into the valve chamber, and thereby prevents outflow of lubricating oil through the oil filler port.
Inventors
- 👤 Taiji Saito
- 👤 Masafumi Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:15
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/04; F01M11/10; F02; F02F; F02F7/00; F02F7/006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
In an overhead camshaft engine which includes a cylinder head, a cylinder head cover having a lower end joined to the upper end of said cylinder head intake and exhaust valves and an oil filler port, said oil filler port having a longitudinal axis extending vertically through the top wall of said cover, a horizontally disposed cam shaft provided in the top of said cylinder head and adapted to operate said intake and exhaust valves, a vertically disposed timing chain gear provided at one end of said cam shaft and a timing chain engaged with said timing chain gear, a system for preventing outflow of oil from said oil filter port, said system comprising a vertical partition wall extending downwardly from said cylinder head cover between said timing chain gear and said oil filler port to divide the interior of said cover into a first chamber having said timing chain and a second chamber having said oil filler port and said intake and exhaust valves.
Claim 2
Dependent Claim
165 words
In an overhead camshaft engine which includes a cylinder head, a cylinder head cover having a lower end joined to the upper end of said cylinder head intake and exhaust valves and an oil filler port, said oil filler port having a longitudinal axis extending vertically through the top wall of said cover, a horizontally disposed cam shaft provided in the top of said cylinder head and adapted to operate said intake and exhaust valves, a vertically disposed timing chain gear provided at one end of said cam shaft and a timing chain engaged with said timing chain gear, a system for preventing outflow of oil from said oil filter port, said system comprising a vertical partition wall extending downwardly from said cylinder head cover between said timing chain gear and said oil filler port to divide the interior of said cover into a first chamber having said timing chain and a second chamber having said oil filler port and said intake and exhaust valves.
Claim 3
Dependent Claim
30 words
The invention as defined in claim 1 wherein said partition wall is integrally formed with the interior surface of said cover and extends across the entire width of said cover.
Claim 4
Dependent Claim
23 words
The invention as defined in claim 2 wherein said partition wall has a substantially straight lower edge slightly spaced above said cam shaft.
Claim 5
Dependent Claim
26 words
The invention as defined in claim 2 wherein said partition wall has a generally semicircular lower edge encircling said cam shaft and slightly spaced apart therefrom.
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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |