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Title:
カムロブ材、これを用いたカムシャフト及びカムロブ材の製造方法
Document Type and Number:
Japanese Patent JP4188970
Kind Code:
B2
Abstract:
The present invention provides a cam lobe material that is excellent in sliding characteristics, such as wear resistance, scuffing resistance and pitting resistance, and can be advantageously used in engines to which high loads are applied, and a method of manufacturing the cam lobe material. The above-described task is fulfilled by providing a cam lobe material that is formed from an iron-based sintered alloy that contains 0.3 to 5.0 mass % Ni, 0.5 to 1.2 mass % C, 0.02 to 0.3 mass % of at least either of B and P, and incidental impurities as the balance, and has a hardness of a peripheral surface of not less than HRC 50 and a density of not less than 7.5 g/cm3. The iron-based sintered alloy can further contain not more than 2.5 mass % Mo. The above-described task can also be fulfilled by a method of manufacturing the cam lobe material, that a compression molding step and a sintering step are repeated at least twice, the compression molding step involving compression molding iron-based alloy powders prepared so as to provide the composition of the ferrous sintered alloy in a prescribed cam lobe shape, and the sintering step involving sintering the compression molded compact body, and that the sintered body is subjected to quench and tempering treatment.

Inventors:
Hiroyuki Takamura
Shunsuke Takeguchi
Application Number:
JP2005512070A
Publication Date:
December 03, 2008
Filing Date:
July 28, 2004
Export Citation:
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Assignee:
Nippon Piston Ring Co., Ltd.
International Classes:
C22C38/00; B22F3/24; C21D7/06; C21D9/30; C22C33/02; F01L1/04; F01L1/047; F16H53/02
Domestic Patent References:
JP9031612A
JP55145151A
JP11050210A
JP3257196B2
JP4017645A
Attorney, Agent or Firm:
Yasuo Ishikawa