Patent US3801690A successfully refreshed from Google Patents.
Patent US4265388A successfully refreshed from Google Patents.
US4265388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of assembled cam shaft
Assignee: Toyota Motor Corp
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Filing: 1978-09-05
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Granted: 1981-05-05
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Expires: 1998-09-05
Abstract
Abstract Process for manufacturing cam shaft characterized in that axial grooves are cut on a cam shaft, while projections with a profile matching the axial grooves and slightly larger than the axial grooves are provided on the fitting surface of pieces to be assembled to the cam shaft, whereby said projections of the pieces are fitted into the grooves of said cam shaft.
Inventors
- 👤 Akio Takahashi
- 👤 Chiaki Tsumuki
- 👤 Hitoshi Nakamura
- 👤 Juro Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F16; F16H; F16H53/00; F16H53/02; F16H53/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49286; Y10T29/49293; Y10T29/49826; Y10T29/49838; Y10T29/49908; Y10T29/49938; Y10T29/4994; Y10T29/49945; Y10T29/53; Y10T29/534; Y10T29/53404; Y10T29/53696
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
A method of making a cam-shaft assembly comprising providing a shaft having an axially extending groove formed in its outer surface, providing a cam having an opening of a diameter slightly greater than the diameter of the shaft and having an inwardly extending projection of a profile generally similar to the profile of the groove in the shaft, said projection forming an interference fit with the groove when aligned therewith and assembled on the shaft, aligning said projection with said groove and forcing said cam axially onto said shaft to a predetermined position on the shaft, said cam gripping said shaft in said position by virtue of the interference of the projection in the groove to restrain the cam against movement both axial and circumferentially relative to the shaft and said projection spacing portions of the surface of the opening in the cam from the surface of the shaft at said position to provide a clearance space, and reducing said clearance space thereby further securing the cam to the shaft at said position.
Claim 2
Independent Claim
173 words
A method of making a cam-shaft assembly comprising providing a shaft having an axially extending groove formed in its outer surface, providing a cam having an opening of a diameter slightly greater than the diameter of the shaft and having an inwardly extending projection of a profile generally similar to the profile of the groove in the shaft, said projection forming an interference fit with the groove when aligned therewith and assembled on the shaft, aligning said projection with said groove and forcing said cam axially onto said shaft to a predetermined position on the shaft, said cam gripping said shaft in said position by virtue of the interference of the projection in the groove to restrain the cam against movement both axial and circumferentially relative to the shaft and said projection spacing portions of the surface of the opening in the cam from the surface of the shaft at said position to provide a clearance space, and reducing said clearance space thereby further securing the cam to the shaft at said position.
Claim 3
Dependent Claim
45 words
A method according to claim 1 wherein said step of providing a cam comprises providing a sintered cam piece, and said step of reducing said clearance space comprises heating the cam and shaft to cause metal diffusion between the sintered cam piece and the shaft.
Claim 4
Dependent Claim
22 words
A method according to claim 1 wherein said step of reducing said clearance space comprises metallurgically bonding the cam to the shaft.
Claim 5
Dependent Claim
27 words
A method according to claim 3 wherein said step of metallurgically bonding comprises heating the cam and shaft and flowing a brazing material into said clearance space.
Claim 6
Dependent Claim
46 words
A method according to claim 1 wherein said projection is at a predetermined position on the cam relative to a lobe of the cam so that forcing said cam on the shaft with the projection in the groove positions the cam lobe circumferentially of the shaft.
Claim 7
Dependent Claim
61 words
A method according to claim 5 further comprising providing a plurality of additional cams each having a said projection at a different position relative to a cam lobe thereof, and forcing each said cam onto said shaft with its projection aligned with said groove of the shaft so that each said cam is differently oriented and phased relative to the shaft.
Claim 8
Dependent Claim
65 words
A method according to claim 5 further comprising providing said shaft with a plurality of circumferentially spaced axially extending grooves, providing a plurality of cams each with a said projection at the same position relative to its lobe, and forcing said cams onto said shaft with each projection in a different groove so that said lobes are differentially oriented and phased relative to the shaft.
Claim 9
Independent Claim
20 words
A method according to claims 1 or 5 wherein said shaft groove is V-shaped and said cam projection is V-shaped.
Claim 10
Independent Claim
20 words
A method according to claims 1 or 5 wherein said shaft groove is U-shaped and said cam projection is U-shaped.
References Cited (Backward Citations)
US581476A
Cited
US3487903A
Cited
US3619882A
Cited
US3823464A
Cited
US3740829A
Cited
US3962772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |