发明名称 |
Poppet valve made of ceramics |
摘要 |
An inclined surface of a valve head extending between a valve stem and a valve seat contacting portion has an annular portion in the place intermediate between the valve steam and the valve seat contacting portion. The inclined surface is ground at the annular portion only.
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申请公布号 |
US4881500(A) |
申请公布日期 |
1989.11.21 |
申请号 |
US19880274908 |
申请日期 |
1988.11.22 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
KOJIMA, TAKIO;TANIGUCHI, MASATO |
分类号 |
F01L3/02;F01L3/20 |
主分类号 |
F01L3/02 |
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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