Toyota Jidosha Kabushiki Kaisha

Kazuhiko Murakoshi

Takayuki Teramoto

In the helical gear, an opening perimeter wall includes a first arc side face located at the leading end side in the direction of rotation, concave towards the leading end side in the direction of rotation, and having a distance from the arc center as a first radius. The first arc side face includes a side face at a side of the rotation center of the hub, located at position with a distance from the arc center differing from the length of the first radius, on a verge of a virtual arcuate line centered about the rotation center, and passing through the arc center.

Helical gear and power transmission apparatus

As to a distance in a radial direction of a rotation shaft from a rim at the hub side to an outer peripheral side face, the outer peripheral side face includes a first side region having a distance located at the most leading end side spot in the direction of rotation of a helical gear longer than a distance at a tail end side spot.

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Anjo, Japan

Kazuhiko Murakoshi