Patent US4941438A successfully refreshed from Google Patents.
US4941438A
Expired / Lapsed
US
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Hydraulic valve-lash adjuster
Assignee: Subaru Corp
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Filing: 1989-10-23
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Granted: 1990-07-17
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Expires: 2009-10-23
Abstract
Abstract A hydraulic valve-lash adjuster has a cylindrical reservoir case provided in a cylindrical head of an engine, and a cylindrical body secured in the reservoir case. A reservoir chamber is formed between a bottom of the reservoir case and the cylindrical body. A plunger is slidably mounted in the cylindrical body, and a high pressure chamber is formed between a bottom of the cylindrical body and a bottom of the plunger. A pivot is slidably mounted in the reservoir case and a helper spring is provided between the plunger and the pivot.
Inventors
- 👤 Naoto Muto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:35
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/2405; F02; F02B; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
A hydraulic valve-lash adjuster for an engine with a valve mechanism having at least one valve and one rocker arm, comprising; a cylindrical reservoir case provided in a cylinder head of the engine; a cylindrical body secured in the reservoir case to form a reservoir chamber between a bottom of the reservoir case and an outside of a bottom of the cylindrical body; a plunger slidably mounted in the cylindrical body to form a high pressure chamber between an inside of a bottom of the cylindrical body and a bottom of the plunger; a spring provided in the high pressure chamber so as to push the plunger; a check valve provided in the high pressure chamber so as to keep pressure of oil in the high pressure chamber; a pivot slidably mounted in the reservoir case so as to engage with the rocker arm; a helper spring provided between the plunger and the pivot; and first passage means for supplying oil to the reservoir chamber and the high pressure chamber.
Claim 2
Dependent Claim
170 words
A hydraulic valve-lash adjuster for an engine with a valve mechanism having at least one valve and one rocker arm, comprising; a cylindrical reservoir case provided in a cylinder head of the engine; a cylindrical body secured in the reservoir case to form a reservoir chamber between a bottom of the reservoir case and an outside of a bottom of the cylindrical body; a plunger slidably mounted in the cylindrical body to form a high pressure chamber between an inside of a bottom of the cylindrical body and a bottom of the plunger; a spring provided in the high pressure chamber so as to push the plunger; a check valve provided in the high pressure chamber so as to keep pressure of oil in the high pressure chamber; a pivot slidably mounted in the reservoir case so as to engage with the rocker arm; a helper spring provided between the plunger and the pivot; and first passage means for supplying oil to the reservoir chamber and the high pressure chamber.
Claim 3
Dependent Claim
27 words
The hydraulic valve-lash adjuster according to claim 1 further comprising second passage means provided in the cylinder head so as to discharge air in the reservoir chamber.
Claim 4
Dependent Claim
29 words
The hydraulic valve-lash adjuster according to claim 1 wherein the valve is inclined with respect to the horizontal and the reservoir case is provided in parallel with the valve.
References Cited (Backward Citations)
US3902467A
Cited
US4498432A
Cited
US4469061A
Cited
US4509467A
Cited
JPS5999012A
Cited
JPS5999011A
Cited
US4546734A
Cited
US4596213A
Cited
US4840151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |