Patent ID: 7296491

Claim:
An injection molded resin gear comprising: an outside rim; an inside hub; a web which extends in radial directions to connect the rim to the hub; a circumferential rib which is formed on a side of the web between the hub and the rim so as to be concentric with the rim; a plurality of first radial ribs which are formed on the side of the web between the hub and the circumferential rib so as to extend from the hub to the circumferential rib and which are arranged in regular intervals in circumferential directions; and a plurality of second radial ribs which are formed on the side of the web between the circumferential rib and the rim so as to extend from the circumferential rib to the rim and which are arranged in regular intervals to be displaced from the first radial ribs in circumferential directions so as to be positioned in circumferential directions between connecting portions at which adjacent two of the first radial ribs are connected to the circumferential rib, wherein a cut scar formed by separating an injection molding gate from the injection molded resin gear is displaced in circumferential directions with respect to the first and second radial ribs.