发明名称 |
Camshaft |
摘要 |
A camshaft of a valve operating system for an internal combustion engine, is formed of iron-based alloy casting and has cam sections, each of which is in slidable contact with a heat resistant tip of a rocker arm. The cam section is formed at its surface portion with a surface hardened layer formed of an air-cooled chilled structure. The surface hardened layer is formed by remelting a part of the surface of the casting after preheating. An intermediate hardened layer of a heat affected zone is formed in contact with the surface hardened layer and has a thickness ranging from 0.5 to 2.0 mm. The intermediate hardened layer is formed of a mixed structure of bainite transformation phase and troostite and is formed by being thermally affected during the remelting.
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申请公布号 |
US4905538(A) |
申请公布日期 |
1990.03.06 |
申请号 |
US19890301077 |
申请日期 |
1989.01.24 |
申请人 |
NISSAN MOTOR CO., LTD. |
发明人 |
WATANABE, KOJI;KANO, MAKOTO;SAWADA, SHIGEOKI;MAKINO, RYOJI |
分类号 |
F01L1/04;C21D9/30;F01L1/047;F16H53/02 |
主分类号 |
F01L1/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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