Claims
- 1. A method of making a camshaft comprising the steps of
- molding a green cam piece composed of outer and inner layers which are respectively formed from outer-layer and inner-layer forming materials, each being adapted to shrink and yield a liquid phase when sintered,
- fitting said green cam piece onto a steel shaft, thereby producing a green camshaft assembly, and
- sintering said green camshaft assembly, thereby axially shrinking said outer layer from 4 to 10% and axially shrinking said inner layer from 2.5 to 6%, so that the outer layer shrinks more than the inner layer, whereby the camshaft assembly has a cam piece which is diffusion-bonded to the outer periphery of said shaft.
- 2. Thee method of claim 1, wherein said inner layer is smaller in axial length than said outer layer.
- 3. The method of claim 1, wherein said outer, layer-forming material comprises a Fe-C-Ni-Cr-Mo system alloy, and said inner, layer-forming material comprises a Fe-C-P system alloy.
- 4. The method of claim 1, wherein said outer, layer-forming material comprises a Fe-C-Ni-Cr-Mo system alloy, and said inner, layer-forming material comprises a Fe-C-P-Mo system alloy.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-61911 |
Mar 1988 |
JPX |
|
Parent Case Info
This application is a continuation, of application Ser. No. 07/324,088 filed on Mar. 16, 1989, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (9)
Number |
Date |
Country |
31002 |
Feb 1983 |
JPX |
58-41211 |
Mar 1983 |
JPX |
58-191458 |
Dec 1983 |
JPX |
58-192942 |
Dec 1983 |
JPX |
59-155660 |
Sep 1984 |
JPX |
59-219402 |
Dec 1984 |
JPX |
60-39105 |
Feb 1985 |
JPX |
60-43405 |
Mar 1985 |
JPX |
230914 |
Nov 1985 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
324088 |
Mar 1989 |
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