Nissan Motor Company Limited

Aichi Machine Industry Co., Ltd.

Hiroyasu Nagami

Yutaka Mabuchi

Takao Mori

Takemichi Yamashita

Takeshi Kariya

Tadashi Goto

A gear pair includes a first gear and a second gear that are engaged and paired with each other, wherein the arithmetic average roughness Ra of the tooth surface of the first gear is less than 0.10, and the arithmetic average roughness Ra of the tooth surface of the second gear is equal to or greater than 0.15. An improvement of the transmission efficiency is achieved due to the improved composite roughness of the gear pair. Accordingly, both of the improvement of the transmission efficiency of the gears and an improvement of the pitting fatigue life are achieved at low cost.

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Kasugai, Japan

Hiroyasu Nagami