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Title:
METHOD OF MANUFACTURING CAMSHAFT, CAMSHAFT, AND CAM LOBE MATERIAL USED FOR THE CAMSHAFT
Document Type and Number:
WIPO Patent Application WO/2005/042931
Kind Code:
A1
Abstract:
A method of manufacturing a cam shaft capable of increasing the degree of freedom of the design of a camlobe by less causing cracking when the cam lobe is joined to the shaft of the camshaft, wherein the cam lobe (1) is joined to the shaft after a residual compressive stress adding treatment is applied to the inner peripheral surface (13) of the cam lobe (1). A residual compressive stress on the inner peripheral surface (13) of the cam lobe (1) is desirably 100 MPa or higher. Also, the residual compressive stress adding treatment can be applied to the outer peripheral surface (14) of the cam lobe (1). As these residual compressive stress adding treatments, a shot peening, an induction hardening, a barrel polishing, a cementation, or a carbonitriding can be used.

Inventors:
Takamura, Hiroyuki c/o Nippon Piston Ring Co. Ltd. (Tochigi Works. 1111, Nogi, Nogi-machi, Shimotsuga-gu, Tochigi 14, 32901, JP)
Application Number:
PCT/JP2004/016046
Publication Date:
May 12, 2005
Filing Date:
October 28, 2004
Export Citation:
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Assignee:
NIPPON PISTON RING CO., LTD. (12-10, Honmachi-higashi 5-chome Chuo-ku, Saitama-sh, Saitama 03, 33885, JP)
Takamura, Hiroyuki c/o Nippon Piston Ring Co. Ltd. (Tochigi Works. 1111, Nogi, Nogi-machi, Shimotsuga-gu, Tochigi 14, 32901, JP)
International Classes:
F01L1/047; C21D1/10; C21D7/06; C21D9/30; (IPC1-7): F01L1/04; B22F3/24; C21D9/30; F16H53/02
Foreign References:
JPH084880A
JPH11229823A
JP2002266983A
JP2001329807A
JPH07243308A
Attorney, Agent or Firm:
Ishikawa, Yasuo (Park Shiba Building 4F, 17-11 Shiba 2-chome, Minato-k, Tokyo 14, 10500, JP)
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