Spark plug and the manufacture method of spark plug

Spark plug and the manufacture method of spark plug

  • CN 102,576,982 B
  • Filed: 09/09/2010
  • Issued: 08/24/2016
  • Est. Priority Date: 10/23/2009
  • Status: Active Grant
First Claim
Patent Images

1. a spark plug, including the main metal fixture of the tubular with tool engagement portion formed molding by extrusion,The section shape orthogonal to the axis of above-mentioned tool engagement portion in alternately having the dodecagon shape of multiple protuberance and recess,Above-mentioned spark plug is characterised by,On the section with orthogonal axe of aforementioned body accessory, by the position being positioned at outermost radial outside by above-mentioned each protuberanceDiameter of a circle be set to D mm, and the diameter of a circle at the position being positioned at radially inner most by above-mentioned each recess is set to dDuring mm,Meet 0.45≤

  • (D-d)/2≤

    0.65,Above-mentioned spark plug is additionally included in the insulator that the inner circumferential side of aforementioned body accessory is fixed, and,Aforementioned body accessory has caulking part, this caulking part from side backward, the rear end of above-mentioned tool engagement portion extend, by withAbove-mentioned insulator is the most locking fixes above-mentioned insulator,Internal diameter at the aforementioned body accessory of the position by forming above-mentioned tool engagement portion is set to Bmm, and by above-mentioned caulking partThe external diameter of base end part when being set to C mm,Meet 0.70≤

    (C-B)/2≤

    1.00.

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