Patent US4236923A successfully refreshed from Google Patents.
US4236923A
Expired / Lapsed
US
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Method of metallurgically joining a fitting to a shaft
Assignee: Toyota Motor Corp
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Filing: 1978-11-14
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Granted: 1980-12-02
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Expires: 1998-11-14
Abstract
Abstract Method of obtaining a metallurgically firm joint between a shaft and its fitting member by assembling on the shaft a fitting member molded of a wear-resistant iron base sinterable alloy which yields a liquid phase in sintering, or by preliminarily sintering such an alloy at a temperature not yielding a liquid phase, and thereafter sintering the assembly at a temperature causing a precipitation of liquid phase, whereby the liquid phase of the fitting member is caused to diffuse and penetrate into the shaft with shrinkage of the sintered part.
Inventors
- 👤 Akio Takahashi
- 👤 Chiaki Tsumuki
- 👤 Hitoshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:07
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; B; B22; B22F; B22F7/00; B22F7/06; B22F7/062; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; B22F2998/00; F01L2301/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
79 words
A method of joining a shaft to a fitting member comprising, molding a fitting member from wear-resistant iron base sinterable alloy powder which yields a liquid phase and shrinks during sintering; assembling said fitting member to a separately produced shaft; and then sintering the assembly of fitting member and shaft at a temperature to cause the fitting member to shrink and to yield a liquid phase of the fitting member to metallurgically bond the fitting member to the shaft.
Claim 2
Independent Claim
79 words
A method of joining a shaft to a fitting member comprising, molding a fitting member from wear-resistant iron base sinterable alloy powder which yields a liquid phase and shrinks during sintering; assembling said fitting member to a separately produced shaft; and then sintering the assembly of fitting member and shaft at a temperature to cause the fitting member to shrink and to yield a liquid phase of the fitting member to metallurgically bond the fitting member to the shaft.
Claim 3
Dependent Claim
20 words
The method of claim 1, wherein the shaft is a cam shaft and the fitting member is a cam piece.
Claim 4
Dependent Claim
41 words
The method of claim 1 or 2, wherein said wear-resistant sinterable iron-base alloy which yields a liquid phase and shrinks during sintering has the composition by weight of C, 0.5-2.0%; Mo, 3.0-18.0%; P, 0.8-3.0%; and B, 0.02-0.3%; the balance being Fe.
Claim 5
Dependent Claim
23 words
The method of claim 2, wherein the steps of molding comprises molding at a pressure in the range of 3-7 t/cm 2 .
Claim 6
Dependent Claim
22 words
The method of claim 2, wherein the fitting member is assembled to the shaft as a slight clearance fit on the shaft.
Claim 7
Dependent Claim
17 words
The method of claim 2, wherein the sintering is done at 1125°-1200° C. in a reducing atmosphere.
Claim 8
Dependent Claim
65 words
The method of claim 2, wherein said wear-resistant iron base alloy powder which yields a liquid phase and shrinks in sintering is molded at a pressure of 3-7 t/cm 2 ; the fitting member in the form of this molded product is assembled to the separately produced shaft; and then the shaft and fitting member assembly is sintered in a reducing atmosphere at 1125°-1200° C.
Claim 9
Independent Claim
94 words
A method of joining a shaft to a fitting member, comprising forming a wear-resistant iron base sinterable alloy powder product which yields a liquid phase and shrinks in sintering; pre-sintering the product at a temperature not yielding a liquid phase to form a fitting member; assembling the fitting member to a separately produced shaft; and thereafter sintering the assembly of shaft and fitting member at a temperature higher than the liquid phase--yielding point of the fitting member to cause the member to shrink and to yield a liquid phase to bond the assembly together.
Claim 10
Independent Claim
94 words
A method of joining a shaft to a fitting member, comprising forming a wear-resistant iron base sinterable alloy powder product which yields a liquid phase and shrinks in sintering; pre-sintering the product at a temperature not yielding a liquid phase to form a fitting member; assembling the fitting member to a separately produced shaft; and thereafter sintering the assembly of shaft and fitting member at a temperature higher than the liquid phase--yielding point of the fitting member to cause the member to shrink and to yield a liquid phase to bond the assembly together.
Claim 11
Dependent Claim
20 words
The method of claim 8, wherein the shaft is a cam shaft and the fitting member is a cam piece.
Claim 12
Dependent Claim
40 words
The method of claim 8 or 9, wherein said wear-resistant iron base sinterable alloy which yields a liquid phase in sintering and shrinks has the composition of C, 0.5-2.0%; Mo, 3.0-18.0%; P, 0.8-3.0%; and B, 0.02-0.3%; the balance being Fe.
Claim 13
Dependent Claim
22 words
The method of claim 9, wherein the pre-sintering is done at a molding pressure 3-7 t/cm 2 and a temperature 850°-1000° C.
Claim 14
Dependent Claim
26 words
The method of claim 9, wherein the fitting member is assembled to the shaft by a technique selected from the group consisting of pressure-fitting or clearance-fitting.
Claim 15
Dependent Claim
17 words
The method of claim 9, wherein the sintering is done at 1125°-1200° C. in a reducing atmosphere.
Claim 16
Dependent Claim
67 words
The method of claim 9, wherein the wear-resistant iron base alloy powder which yields a liquid phase and shrinks in sintering is pre-sintered at a molding pressure 3-7 t/cm 2 and a temperature 850°-1000° C.; the fitting member thus produced is assembled by clearance-fitting to the separately produced shaft; and then the assembly of shaft and fitting member is sintered at 1125°-1200° C. in a reducing atmosphere.
References Cited (Backward Citations)
US3753704A
Cited
US3761257A
Cited
US3791798A
Cited
US3808659A
Cited
US3889349A
Cited
US3962772A
Cited
US4090873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |