US4761870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a camshaft
Assignee: Nippon Piston Ring Co Ltd
•
Filing: 1987-08-06
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Granted: 1988-08-09
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Expires: 2007-08-06
Abstract
Abstract A fabricated camshaft having individual lobes mounted on tubular collars that are in turn mounted on an internal tubular member that is expanded between the collars to form bearing journals for the camshaft.
Inventors
- 👤 Shigeru Urano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:37
CPC Classifications
F; F16; F16H; F16H53/00; F16H53/02; F16H53/025; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L2001/0475; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
A method for forming a cam shaft for use in an internal combustion engine, comprising the steps of: arranging a plurality of cam lobes each having an opening therethrough, the opening of each said lobe being aligned generally with the axis of rotation of the cam lobe, the axes of rotation of said arranged lobes being aligned with each other; inserting one of a plurality of tubular collars to fit within said openings in said lobes; spacing the ends of said collars apart from each other to form at least one circumferential gap; inserting a central tubular member within said spaced collars; and expanding said central tubular member within said circumferential gap to form a bearing journal for said cam shaft.
Claim 2
Independent Claim
121 words
A method for forming a cam shaft for use in an internal combustion engine, comprising the steps of: arranging a plurality of cam lobes each having an opening therethrough, the opening of each said lobe being aligned generally with the axis of rotation of the cam lobe, the axes of rotation of said arranged lobes being aligned with each other; inserting one of a plurality of tubular collars to fit within said openings in said lobes; spacing the ends of said collars apart from each other to form at least one circumferential gap; inserting a central tubular member within said spaced collars; and expanding said central tubular member within said circumferential gap to form a bearing journal for said cam shaft.
Claim 3
Dependent Claim
36 words
A method according to claim 1 wherein the step of expanding said central tubular member includes the step of expanding said central tubular member in a notch in one end of each of said tubular collars.
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) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |