| 发明名称 | Ignition plug | ||
| 摘要 | An ignition plug, wherein, when a relative density of a portion of an insulator, which is positioned between a radial virtual plane including a front end of the insulator and a radial virtual plane including a front end of a portion of the insulator which is in contact with a metal shell or the plate packing, is referred to as A (%), and a relative density of a portion of the insulator, which is positioned between the radial virtual plane including the front end of the portion of the insulator which is in contact with the metal shell or the plate packing and a radial virtual plane including a center of a resistor in an axial direction, is referred to as B (%), the following equations are satisfied: 93.90≦A, and 0.10≦A−B≦0.90. | ||
| 申请公布号 | US8928214(B2) | 申请公布日期 | 2015.01.06 |
| 申请号 | US201314042836 | 申请日期 | 2013.10.01 |
| 申请人 | NGK Spark Plug Co., Ltd. | 发明人 | Saji Toshimasa;Kurono Hirokazu;Honda Toshitaka |
| 分类号 | H01T13/38;H01T13/20;H01T13/41 | 主分类号 | H01T13/38 |
| 代理机构 | Sughrue Mion, PLLC | 代理人 | Sughrue Mion, PLLC |
| 主权项 | 1. An ignition plug comprising: an insulator having an axial hole which extends in an axial direction; a center electrode which is inserted in a front end side of the axial hole; a metal shell which is provided on an outer circumference of the insulator; and a resistor which is disposed in the axial hole at a position further rearwards than the center electrode, wherein the insulator includes a step portion which engages with the metal shell directly or via an annular plate packing, wherein the resistor is positioned further rearwards in the axial direction than the step portion, wherein, when a relative density of a portion of the insulator, which is positioned between a radial virtual plane including a front end of the insulator and a radial virtual plane including a front end of a portion of the insulator which is in contact with the metal shell or the plate packing, is referred to as A (%), and a relative density of a portion of the insulator, which is positioned between the radial virtual plane including the front end of the portion of the insulator which is in contact with the metal shell or the plate packing and a radial virtual plane including a center of the resistor in the axial direction, is referred to as B (%), the following equations are satisfied: 93.90≦A, and 0.10≦A−B≦0.90. | ||
| 地址 | Aichi-ken JP | ||