Mitsubishi Denki Kabushiki Kaisha

Kyoithi Okamoto

Akira Morishita

Takemi Arima

Yukio Kako

Toshihiko Gotoh

A planetary reduction gear has an internally-toothed ring gear which is made of a molded synthetic resin. The ring gear has a rim formed in its outer periphery in which is formed a plurality of seats comprising through seats and non-piercing holes, the seats being provided at equal intervals around the periphery of the rim. The non-piercing seats extend only part way through the thickness of the rim. The provision of seats over the entire periphery of the rim causes sink marks which develop at the time of molding of the ring gear to act uniformly and deformation of the ring gear is prevented.

Growing community of inventors

Himeji, Japan

Kyoithi Okamoto