US4475490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve lifter
Assignee: Toyota Motor Corp
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Filing: 1982-05-28
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Granted: 1984-10-09
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Expires: 2002-05-28
Abstract
Abstract The present invention proposes a hydraulic valve lifter used in an internal combustion engine. The valve lifter has a body consisting of a hollow cylindrical portion accommodating a cylindrical plunger and a lower end portion engaging with a cam controlling the valve motion. The two portions are joined together by welding. The bottom of the plunger is cut out annularly for preventing interference between the plunger and flash, which flash is caused by welding and remains in the inner recess of the lifter body.
Inventors
- 👤 Katsuyasu Oono
- 👤 Gozo Kaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:06
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/245; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49247
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A hydraulic valve lifter comprising a body including a hollow cylindrical portion having an axially extending hole and a lower end portion having an outer surface for contacting a cam and a flat surface facing said cylindrical portion, said end portion being welded to said cylindrical portion at said flat surface; and a plunger slidably mounted within said hole along an inner surface of said cylindrical portion; said plunger having a bottom for engaging said flat surface with a peripheral annular cut-out in said bottom facing said end portion to avoid contact with inwardly projecting flash on said cylindrical portion caused by welding of said cylindrical portion to said end portion.
Claim 2
Dependent Claim
111 words
A hydraulic valve lifter comprising a body including a hollow cylindrical portion having an axially extending hole and a lower end portion having an outer surface for contacting a cam and a flat surface facing said cylindrical portion, said end portion being welded to said cylindrical portion at said flat surface; and a plunger slidably mounted within said hole along an inner surface of said cylindrical portion; said plunger having a bottom for engaging said flat surface with a peripheral annular cut-out in said bottom facing said end portion to avoid contact with inwardly projecting flash on said cylindrical portion caused by welding of said cylindrical portion to said end portion.
Claim 3
Dependent Claim
22 words
A valve lifter according to claim 1, wherein said cylindrical portion and said end portion are welded by means of resistance welding.
Claim 4
Dependent Claim
22 words
A valve lifter according to claim 1, wherein said cylindrical portion and said end portion are welded by means of projection welding.
Claim 5
Dependent Claim
23 words
A valve lifter according to claim 1, wherein a cross section of said annular cut-out of said plunger is of a rectangular shape.
Claim 6
Dependent Claim
23 words
A valve lifter according to claim 1, wherein a cross section of said annular cut-out of said plunger is of a triangular shape.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |