US4732310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite camshaft and method of making the same
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1984-03-23
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Granted: 1988-03-22
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Expires: 2004-03-23
Abstract
Abstract A composite camshaft is formed by brazing a journal to a shaft. After a brazing material is fitted into an annular groove formed on the center of the inner peripheral surface of a shaft-receiving bore in the journal, the journal is fitted onto the shaft and the brazing material is heated until it melts. The molten brazing material consequently completely fills a clearance between the inner peripheral of the shaft-receiving bore in the journal and the outer peripheral surface of the shaft, ensuring that the journal and the shaft are firmly connected.
Inventors
- 👤 Genkichi Umeha
- 👤 Takasi Uda
- 👤 Shunsuke Takeguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:51
CPC Classifications
F; F16; F16H; F16H53/00; F16H53/02; F16H53/025; B; B23; B23K; B23K1/00; B23K1/0008; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49945
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A composite camshaft comprising a fitting member provided with a shaft-receiving bore and mounted on a shaft with a clearance therebetween and bonded to said shaft by a brazing material, wherein said fitting member is formed with an annular groove disposed in the central portion of the inner surface of said shaft-receiving bore, said annular groove containing said brazing material, which upon heating, melts to fill the clearance and bond the fitting member with the shaft as a unitary body, said brazing material being larger in diameter than said annular groove so as to extend along the bottom of said annular groove.
Claim 2
Dependent Claim
102 words
A composite camshaft comprising a fitting member provided with a shaft-receiving bore and mounted on a shaft with a clearance therebetween and bonded to said shaft by a brazing material, wherein said fitting member is formed with an annular groove disposed in the central portion of the inner surface of said shaft-receiving bore, said annular groove containing said brazing material, which upon heating, melts to fill the clearance and bond the fitting member with the shaft as a unitary body, said brazing material being larger in diameter than said annular groove so as to extend along the bottom of said annular groove.
Claim 3
Independent Claim
128 words
A method of making a composite camshaft having a fitting member provided with a shaft-receiving bore to be mounted on a shaft and bonded to said shaft by a brazing material which comprises the steps of forming an annular groove in the central portion of the inner surface of said shaft-receiving bore, disposing said brazing material in said annular groove in a manner that said brazing material is larger in diameter than said annular groove so as to extend along the bottom of said annular groove, inserting said shaft into said shaft-receiving bore to mount said fitting member on said shaft with a clearance therebetween, and melting said brazing material by heat to fill the clearance and bond said fitting member to said shaft as a unitary body.
Claim 4
Independent Claim
128 words
A method of making a composite camshaft having a fitting member provided with a shaft-receiving bore to be mounted on a shaft and bonded to said shaft by a brazing material which comprises the steps of forming an annular groove in the central portion of the inner surface of said shaft-receiving bore, disposing said brazing material in said annular groove in a manner that said brazing material is larger in diameter than said annular groove so as to extend along the bottom of said annular groove, inserting said shaft into said shaft-receiving bore to mount said fitting member on said shaft with a clearance therebetween, and melting said brazing material by heat to fill the clearance and bond said fitting member to said shaft as a unitary body.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein the composite is heated at a temperature of 1120° C. for 90 minutes in a decomposed ammonium gas atmosphere.
Claim 6
Dependent Claim
30 words
The composite camshaft of claim 1 wherein a clearance of 0.1 mm in disposed between the inner surface of the shaft receiving bore and the outer surface of the shaft.
Claim 7
Dependent Claim
13 words
The composite camshaft of claim 1 wherein the groove is a rectangular groove.
Claim 8
Dependent Claim
40 words
The composite camshaft of claim 1 wherein a clearance is provided between the fitting member and the shaft and the volume of the brazing material in the annular groove is about 11/2 times larger than the volume of said clearance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |