发明授权
- 专利标题: Manufacturing method of resistor-incorporated spark plug
- 专利标题(中): 电阻式火花塞的制造方法
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申请号: US09546664申请日: 2000-04-10
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公开(公告)号: US06334800B1公开(公告)日: 2002-01-01
- 发明人: Kenichi Nishikawa , Yutaka Tanaka , Toshitaka Honda , Makoto Sugimoto
- 申请人: Kenichi Nishikawa , Yutaka Tanaka , Toshitaka Honda , Makoto Sugimoto
- 优先权: JP9-105490 19970423; JP9-106975 19970424; JP9-107141 19970424; JP9-257542 19970905; JP9-362693 19971212; JP10-104158 19980330
- 主分类号: H01T2102
- IPC分类号: H01T2102
摘要:
In a spark plug (100), the resistor composition constituting a resistor (15) contains semiconductive ceramic particles, offering a superior load life characteristic. Also, the value of (&agr;2−&agr;1)/&agr;1>=−0.30, where a value of electric resistance between a terminal (13) and a center electrode (3) is &agr;1 at 20° C. and &agr;2 at 150° C., so that deterioration of the radio frequency noise prevention performance at high temperatures can be effectively suppressed. The resistor composition contains semiconductive ceramic particles whose temperature coefficient of electric resistance shows a positive value, or a negative value of relatively small absolute value, (e.g., TiO2 particles having a rutile type crystalline structure, titanate or zirconate of alkali earth metal elements, titanium suboxide, etc.), or titanium metal. Thus, the invention provides a resistor-incorporated spark plug which is enabled to offer a stable load life characteristic even when a high load acts thereon, and which is unlikely to deteriorate in the radio frequency noise prevention performance even under high temperatures.