Patent US5044224A successfully refreshed from Google Patents.
US5044224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camshaft
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1990-10-25
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Granted: 1991-09-03
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Expires: 2010-10-25
Abstract
Abstract A camshaft comprising a steel shaft and a plurality of cam pieces fitted on the shaft. The cam piece is made from a sintering alloy material and bonded to the shaft by sintering. The shaft has pin-receiving holes perpendicular to the axis of the shift. The cam piece is formed on its side surface with a pin-receiving groove. A positioning pin has a lower portion tightly fitted in the hole of the shaft and an upper portion fitted in the groove to position the cam piece with respect to the shaft during sintering.
Inventors
- 👤 Takeshi Hiraoka
- 👤 Shunsuke Takeguchi
- 👤 Satoshi Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:04
CPC Classifications
F; F16; F16D; F16D1/00; F16D1/06; F16D1/08; F16D1/0894; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F16D1/064; F16H; F16H53/00; F16H53/02; F16H53/025; B; B22; B22F; B22F2998/00; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7018; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2173; Y10T74/2174; Y10T74/2175; Y10T74/2177
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A camshaft comprising a steel shaft, at least one pin-receiving hole formed in the outer surface of said shaft and perpendicular to the axis of said shaft, cam pieces made from a sintering alloy material and secured to said shaft by sintering, a pin-receiving groove formed in the side surface of each of said cam pieces, a positioning pin having a lower portion inserted into and tightly held by each of said holes and an upper portion fitted in said pin-receiving groove to define the axial and peripheral portions of said cam pieces on said shaft when said cam piece is sintered, said positioning pin having a straight configuration and said pin-receiving hole having a tapered configuration.
Claim 2
Dependent Claim
117 words
A camshaft comprising a steel shaft, at least one pin-receiving hole formed in the outer surface of said shaft and perpendicular to the axis of said shaft, cam pieces made from a sintering alloy material and secured to said shaft by sintering, a pin-receiving groove formed in the side surface of each of said cam pieces, a positioning pin having a lower portion inserted into and tightly held by each of said holes and an upper portion fitted in said pin-receiving groove to define the axial and peripheral portions of said cam pieces on said shaft when said cam piece is sintered, said positioning pin having a straight configuration and said pin-receiving hole having a tapered configuration.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |