US4554895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic lifter for internal combustion engines
Assignee: Aisin Corp
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Filing: 1984-02-08
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Granted: 1985-11-26
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Expires: 2004-02-08
Abstract
Abstract A hydraulic lifter incorporated into a rocker arm of a valve train in an internal combustion engine includes a cylinder formed in the rocker arm, a plunger arranged slidably in the cylinder, a valve seat member dividing an inside portion of the cylinder into a pressure chamber and a reservoir chamber for working fluid, a check valve allowing the working fluid to flow from the reservoir chamber into the pressure chamber, a spring positioned within the pressure chamber to bias the plunger, and a passage for supplying the working fluid to the reservoir chamber.
Inventors
- 👤 Takuro Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:33
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/2411; F01L1/02; F01L1/04; F01L1/047; F01L1/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A hydraulic lifter for internal combustion engines, comprising: a valve train including a rotating cam, a rocker arm and a valve stem, said rocker arm receiving the load from said rotating cam by one end and operating said valve stem by the other end; a cylinder formed as an open-lower-end hole in said one end of said rocker arm; a plunger slidably inserted into the lower portion of said cylinder and contacting an upper end of said valve stem; valve means arranged in said cylinder and dividing the internal space of said cylinder into a pressure chamber of the lower portion and an oil reservoir chamber of the upper portion, said valve means including means for allowing said oil to flow from said reservoir chamber into said pressure chamber; a spring positioned within said pressure chamber and biasing said plunger to said valve stem; and oil inlet means opened at the upper end portion of said reservoir chamber.
Claim 2
Dependent Claim
158 words
A hydraulic lifter for internal combustion engines, comprising: a valve train including a rotating cam, a rocker arm and a valve stem, said rocker arm receiving the load from said rotating cam by one end and operating said valve stem by the other end; a cylinder formed as an open-lower-end hole in said one end of said rocker arm; a plunger slidably inserted into the lower portion of said cylinder and contacting an upper end of said valve stem; valve means arranged in said cylinder and dividing the internal space of said cylinder into a pressure chamber of the lower portion and an oil reservoir chamber of the upper portion, said valve means including means for allowing said oil to flow from said reservoir chamber into said pressure chamber; a spring positioned within said pressure chamber and biasing said plunger to said valve stem; and oil inlet means opened at the upper end portion of said reservoir chamber.
References Cited (Backward Citations)
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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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |