Spark plug and method for producing spark plug

Spark plug and method for producing spark plug

  • CN 102,576,982 A
  • Filed: 09/09/2010
  • Published: 07/11/2012
  • Est. Priority Date: 10/23/2009
  • Status: Active Application
First Claim
Patent Images

1. a spark plug comprises the cylindrical main body accessory with instrument holding section that forms through extrusion molding,The section shape with the axle quadrature of above-mentioned instrument holding section is the dodecagon shape that alternately has a plurality of protuberances and recess,Above-mentioned spark plug is characterised in that,On the aforementioned body accessory and section orthogonal axe, the diameter of a circle at the position that is positioned at outermost radial outside that will be through above-mentioned each protuberance is made as D (mm), and will be made as d (mm) through the diameter of a circle that is positioned at radially the most inboard position of above-mentioned each recess the time,Satisfy 0.45≤

  • (D-d)/2≤

    0.75.

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