发明授权
US4289990A Spark plug with a stepped insulator and an inner constriction in the
housing
失效
具有阶梯绝缘体的火花塞和壳体中的内部收缩
- 专利标题： Spark plug with a stepped insulator and an inner constriction in the housing
- 专利标题（中）： 具有阶梯绝缘体的火花塞和壳体中的内部收缩
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申请号： US20323申请日： 1979-03-14
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公开(公告)号： US4289990A公开(公告)日： 1981-09-15
- 发明人: Kazuhisa Mayumi , Katsumi Suzuki , Fujio Tsuboi
- 申请人： Kazuhisa Mayumi , Katsumi Suzuki , Fujio Tsuboi
- 申请人地址： JPX Toyota JPX Nagoya
- 专利权人： Toyota Jidosha Kogyo Kabushiki Kaisha,NGK Spark Plugs Co., Ltd.
- 当前专利权人： Toyota Jidosha Kogyo Kabushiki Kaisha,NGK Spark Plugs Co., Ltd.
- 当前专利权人地址： JPX Toyota JPX Nagoya
- 优先权： JPX53-143091[U] 19781017
- 主分类号： H01T13/20
- IPC分类号： H01T13/20 ; H01T13/14 ; H01T13/32
摘要：
A spark plug is disclosed, in which the insulator is formed with a stepped portion near its tip portion and the housing which surrounds the insulator is formed with an inner constriction which opposes the smaller portion of the insulator, near the stepped portion, with a small annular gap being left therebetween, thereby hindering the entry of air/fuel mixture and carbon particles into the inner space between the housing and the insulator, and thus reducing the buildup of carbon on the insulator.
公开/授权文献
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