Ngk Spark Plug Company, Limited

Magoki Shimadate

Tomoaki Kato

Kenji Ban

Tatsuya Gozawa

Daisuke Sumoyama

Yoshikazu Kataoka

Yusuke Kawashima

An electrode tip for a spark plug, wherein Pt is contained as a main component, 7% by mass or more of Rh is contained, and a total content of Pt and Rh is greater than or equal to 95% by mass. The electrode tip includes: a narrow portion having the same cross-sectional shape in a direction of an axis; and a wide portion which is adjacent to the narrow portion and has a cross-sectional area, in a radial direction, which is greater than the narrow portion.

Electrode tip for spark plug, and spark plug

In a spark plug, at a cross section of a ground electrode which is orthogonal to a longitudinal direction of an electrode base material and passes an axis of an electrode tip, a surface of the base material is exposed, and the following conditions are satisfied: 1.2E&#x2266;F&#x2266;1.9E; 0.05 mm&#x2266;Da&#x2266;0.30 mm; 0.05 mm&#x2266;Db&#x2266;0.30 mm; and 0.20 mm&#x2266;J&#x2266;0.70 mm.

Spark plug

A spark plug wherein an outer diameter of a first face that is a gap foliating face of the center electrode tip is denoted as R, an outer diameter of a second face that is a gap forming face of the ground electrode tip is denoted as R, a length of the gap is denoted as G, and an average distance of a distance between an end in the first direction of the first face and an end in the first direction of the second face and a distance between an end in the second direction of the first face and an end in the second direction of the second face is denoted as G, R&#x3c;R, 0.5 mm&#x2266;R&#x2266;1.1 mm, 0.7 mm&#x2266;R&#x2266;1.2 mm, 0.6 mm&#x2266;G&#x2266;1.3 mm, and 1.4&#x2266;(R/R)&#xd7;(G/G)&#x2266;1.8 are satisfied.

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Takahama, Japan

Magoki Shimadate