US4942855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating system of a valve mechanism for a double overhead camshaft engine
Assignee: Subaru Corp
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Filing: 1989-10-23
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Granted: 1990-07-24
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Expires: 2009-10-23
Abstract
Abstract A lubricating system has a main oil gallery provided for supplying pressurized oil, a first gallery connected with the main gallery for supplying first lubricating oil to the hydraulic valve-lash adjusters. A relief valve is provided for keeping pressure of the first lubricating oil constant. A second gallery is provided for supplying second lubricating oil to journals of the camshafts, and nozzles are provided for lubricating a camshaft and rocker arm for a valve disposed in an upper position than another valve.
Inventors
- 👤 Naoto Muto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:26
CPC Classifications
F; F01; F01M; F01M9/00; F01M9/10; F01M9/101; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01M9/102; F02; F02B; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
A lubricating system of a valve mechanism for a double overhead camshaft engine having opposed cylinders, an intake valve and an exhaust valve which are disposed one above the other in a vertical plane, camshafts, rocker arms and hydraulic valve-lash adjusters, characterized in that the system has: a main oil gallery provided for supplying pressurized oil to the valve mechanism; a first gallery connected with the main gallery for supplying first lubricating oil to the hydraulic valve-lash adjusters; means for keeping pressure of the first lubricating oil constant; a second gallery connected with the main gallery for supplying second lubricating oil to journals of the camshafts; a third gallery connected with the main gallery; nozzles connected with the third gallery for ejecting third lubricating oil to the camshaft and rocker arm of the upper valve.
Claim 2
Dependent Claim
135 words
A lubricating system of a valve mechanism for a double overhead camshaft engine having opposed cylinders, an intake valve and an exhaust valve which are disposed one above the other in a vertical plane, camshafts, rocker arms and hydraulic valve-lash adjusters, characterized in that the system has: a main oil gallery provided for supplying pressurized oil to the valve mechanism; a first gallery connected with the main gallery for supplying first lubricating oil to the hydraulic valve-lash adjusters; means for keeping pressure of the first lubricating oil constant; a second gallery connected with the main gallery for supplying second lubricating oil to journals of the camshafts; a third gallery connected with the main gallery; nozzles connected with the third gallery for ejecting third lubricating oil to the camshaft and rocker arm of the upper valve.
Claim 3
Dependent Claim
30 words
The system according to claim 1, wherein the means comprises an orifice and a relief valve provided in the first gallery for maintaining the pressure of the first lubricating oil.
Claim 4
Dependent Claim
47 words
The system according to claim 1 further comprising; front holders for securing ends of the respective camshafts; the camshafts having respective oil passages between the ends of the camshafts and the journals neighboring to the front holders; and the passages provided for communicating with the second gallery.
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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |