Patent ID: 8216104

Claim:
A gear set comprising: a first gear that is rotatable around a first axis; and a second gear that is rotatable around a second axis inclined with respect to the first axis, and that is in mesh with the first gear so that torque is transmittable, wherein one of the first and second gears includes a plurality of retention grooves that are arranged so as to radiate around the axis of the one of the first and second gears and a plurality of pins that are retained in the respective retention grooves and that respectively constitute teeth of the one of the first and second gears, the other one of the first and second gears includes a plurality of tooth grooves that are arranged so as to radiate around the axis of the other one of the first and second gears and that are engageable with the pins, a resultant force of forces applied to each pin from the retention groove and the tooth groove urges the pin toward the retention groove, and a first contact angle at which each pin contacts with an inner surface of the retention groove is larger than a second contact angle at which the pin contacts with an inner surface of the tooth groove.