Spark plug

Spark plug

  • CN 102,959,812 B
  • Filed: 03/03/2011
  • Issued: 09/23/2015
  • Est. Priority Date: 06/28/2010
  • Status: Active Grant
First Claim
Patent Images

1. a spark plug, is characterized in that,This spark plug comprises:

  • Bar-shaped central electrode, it extends in the axial direction;

    Insulation electroceramics, it is located at the periphery of above-mentioned central electrode;

    Base metal housing, it is located at the periphery of above-mentioned insulation electroceramics;

    AndGrounding electrode, it engages with aforementioned body metal shell, between this grounding electrode and above-mentioned central electrode, form gap,This grounding electrode comprises grounding electrode mother metal and rectangular-shaped noble metal electrode head,Above-mentioned grounding electrode mother metal extends towards above-mentioned central electrode from aforementioned body metal shell, and the 1st mother metal face had as the end face of above-mentioned central electrode side and the 2nd mother metal face adjacent with above-mentioned 1st mother metal face, the area of section S in the cross section orthogonal with the central axis of this grounding electrode mother metal self of this grounding electrode mother metal is 1.8mm 2

    S≤

    3.2mm 2, Above-mentioned noble metal electrode head is embedded in above-mentioned grounding electrode mother metal by resistance welded with the state of giving prominence to from above-mentioned 1st mother metal face and above-mentioned 2nd mother metal face, and has the opposite face relative with above-mentioned central electrode;

    Above-mentioned noble metal electrode head is imbedded the degree of depth in above-mentioned 2nd mother metal face and burial depth A and above-mentioned noble metal electrode head by above-mentioned resistance welded and is met 0.7≤

    (A/B)≤

    0.8 along the relation imbedded between the thickness in direction in above-mentioned 2nd mother metal face and electrode tip thickness B.

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