Jidosha Kiki Co., Ltd.

Kazuhisa Iizasa

Koji Hatanaka

A self temperature control type glow plug includes first and second resistor elements and a sheath. The sheath diameter of a first portion of the sheath in which the first resistor element is embedded is set to be smaller than the sheath diameter of a second portion of the sheath in which the second resistor element is embedded, wherein the ratio of the latter diameter of the former diameter ranges from 1.3:1 to 2:1. A tapered portion of the sheath joining the first and second sheath portions encloses a gap larger than at least the sheath diameter of the portion in which the first resistor element is embedded between the first and second resistor elements. The first and second resistor elements are connected to each other within the gap through a connecting means having a substantially zero resistance.

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Saitama, Japan

Kazuhisa Iizasa