Enplas Corporation

Yasutaka Kawakami

Kenji Ohmi

In a gear (G) according to the present invention, which is provided with a plurality of teeth () to be mated with teeth of a mating gear to thereby transmit a rotational motion, a predetermined region (A) in at least one tooth flank () of each tooth () is formed in a configuration such that, from at least one place in a tooth width direction on a crossing () of the tooth flank () and a tooth tip surface (), the mating with the teeth of the mating gear is started with the point contact or the line contact shorter than the total tooth width, and thereafter, is gradually shifted to the line contact so that the length of contact line () thereof is sequentially increased as the line contact moves from a tooth tip surface () side toward a tooth root side.

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Kawaguchi, Japan

Yasutaka Kawakami