公开(公告)号：US20140292179A1

公开(公告)日：2014-10-02

申请号：US14353699

申请日：2012-11-12

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kohei Katsuraya ,  Katsutoshi Nakayama

IPC: H01T13/20

CPC classification number: H01T13/20 ,  F02P3/01 ,  F02P13/00 ,  F02P23/04 ,  H01T13/16 ,  H01T13/50 ,  H05H1/52 ,  H05H2001/4682

Abstract: An ignition plug (1) includes a center electrode (5) extending in the direction of an axis (CL1), an insulator (2) having an axial hole (4) into which the center electrode (5) is inserted, a tip (31) joined to a forward end portion of the center electrode (5) by a fusion portion (35), and a ground electrode (27) forming a gap (33) in cooperation with the tip (31). The ignition plug generates high-frequency plasma at the gap (33) when high-frequency electric power is supplied to the gap (33). The forward end of the tip (31) is located forward of the forward end of the insulator (2) with respect to the direction of the axis (CL1). Also, at least a portion of the outer surface of the fusion portion (35) is located within the axial hole (4), and, the distance between a forward-end-side opening of the axial hole (4) and the rearmost end of the outer surface of the fusion portion (35), measured along the axis (CL1), is equal to or greater than 0.1 mm. Thus, in the ignition plug (1) which generates high-frequency plasma, corrosion of the fusion portion can be suppressed effectively, whereby durability is improved.

Abstract translation: 火花塞（1）包括沿着轴线（CL1）的方向延伸的中心电极（5），具有插入中心电极（5）的轴向孔（4）的绝缘体（2），尖端 31）通过熔接部（35）与中心电极（5）的前端部分接合，和与顶端（31）配合形成间隙（33）的接地电极（27）。 当向间隙（33）供给高频电力时，火花塞在间隙（33）产生高频等离子体。 尖端（31）的前端相对于轴线（CL1）的方向位于绝缘体（2）的前端的前方。 此外，熔融部（35）的外表面的至少一部分位于轴向孔（4）内，并且轴向孔（4）的前端侧开口与最后端 沿着轴线（CL1）测量的熔融部分（35）的外表面的厚度等于或大于0.1mm。 因此，在产生高频等离子体的火花塞（1）中，可以有效地抑制熔融部的腐蚀，提高耐久性。

公开(公告)号：US20130234608A1

公开(公告)日：2013-09-12

申请号：US13782134

申请日：2013-03-01

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Katsutoshi Nakayama ,  Kohei Katsuraya

IPC: H01T13/40

CPC classification number: H01T13/40 ,  F02P1/00

Abstract: A superior ignitability is realized assuredly by specifying at least either of a relation in magnitude between absolute values of a plus-side voltage and a minus-side voltage and a relation in magnitude between absolute values of a plus-side current and a minus-side current when alternating current power is introduced. An ignition system includes a spark plug, a discharging power supply which applies a voltage to a spark gap of the spark plug to thereby generate an electric spark discharge and an alternating current power supply which introduces alternating current power to an electric spark generated by the electric spark discharge to generate an alternating current plasma.

Abstract translation: 通过确定正侧电压和负侧电压的绝对值与负侧电压的绝对值之间的关系以及正侧电流和负侧电流的绝对值之间的关系中的至少一个，可靠地实现优异的点火性 引入交流电时的电流。 点火系统包括火花塞，放电电源，其向火花塞的火花隙施加电压，从而产生电火花放电;以及交流电源，其将交流电力引入由电 火花放电产生交流等离子体。