Denso Corporation

Shin Hase

Masamichi Shibata

Hirofumi Suzuki

Kenji Hattori

Yasuomi Imanaka

Tomoyuki Watanabe

Hiroshi Araki

Toshiya Nakamura

A spark plugincludes a cylindrical housing, a cylindrical insulator, a center electrode, a terminal bracket, a ground electrode, and a resistor. The insulator is held on the inside of the housing. The center electrodeis held on the inside of the insulator, with a tip end being projected therefrom. The terminal bracket is held on the inside of the insulator, with a base end part and being projected therefrom. The ground electrode forms a spark discharge gap G between itself and the center electrode. The resistor contains carbon and is disposed on the inside of the insulator so as to be located between the center electrodeand the terminal bracket. In an axial direction X of the spark plug, the resistor has a higher carbon content in a first region positioned on a tip side, compared to a second region positioned on a base end side.

Spark plug for internal combustion engine

Growing community of inventors

Kariya, Japan

Shin Hase