Ceramic valves for use in internal combustion engines and a process for producing the same.,申请号EP19890310486-传众专利搜索

Ceramic valves for use in internal combustion engines and a process for producing the same.

申请公布号：EP0364278(A1)

申请号：EP19890310486

申请日期：1989.10.12

申请公布日期：1990.04.18

申请人：

NGK INSULATORS, LTD.

发明人：HORI, YOSHIAKI;KAWASAKI, KIYONORI

分类号：F01L3/02;F01L3/10;F02B1/04

主分类号：F01L3/02

摘要：<p>The ceramic valve comprises a valve rod (2) and a valve body (1) provided at one end of the valve rod. The valve rod has an annular groove (3) at its other end, into which a cotter is to be fitted. The annular groove (3) possesses a surface roughness having a maximum height of not more than 3.2 mu m. This prevents occurrence of cracks in the valve during extensive use. To produce such ceramic valves, the process comprises forming a shaped body in which a valve body and the annular groove are formed, and finish polishing the annular groove to a surface roughness having a maximum height of not more than 3.2 mu m.</p>