Patent ID: 7334495

Claim:
A resin gear comprising: a rim having teeth on an outer periphery thereof; a hub for receiving therein a driving shaft, one end portion of the hub having a key receiving portion for engaging a key of the driving shaft; a rib arranged between said rim and said hub; and a web having an outside web portion and an inside web portion, said outside web portion extending in radial directions to connect said rim to said rib, and said inside web portion extending in radial directions to connect said rib to said hub, wherein said key receiving portion has a side wall for preventing relative rotation of the key to the hub, and a bottom wall for allowing the key and the hub from being positioned in directions parallel to the driving shaft, and said inside web portion of said web is arranged so as to be shifted from the bottom wall of the key receiving portion toward a contact portion in which the key contacts the side wall of the key receiving portion, said inside web portion being arranged so as to be shifted from said outside web portion in one of said directions parallel to the driving shaft.