Denso Corporation

Shintaro Itoh

Akimitsu Sugiura

Tetsuya Miwa

Kanechiyo Terada

Fumiaki Aoki

Kaori Doi

Daisuke Tanaka

Ryota Wakasugi

A spark plug has a tubular ground electrode, an insulator, and a center electrode. The insulator has an insulator protruding portion protruding to a tip end side in a plug axial direction with respect to the ground electrode. The center electrodehas an exposed portion exposed through a tip end of the insulator protruding portion. The exposed portion of the center electrode has a first part covering the insulator protruding portion from the tip end side in the plug axial direction, and a second part extending from the first part to a base end side in the plug axial direction and covering the entire circumference of an outer peripheral surface of the insulator protruding portion from an outer peripheral side in a plug radial direction.

Spark plug for internal combustion engine

Growing community of inventors

Nisshin, Japan

Shintaro Itoh