Patent ID: 7155995

Claim:
An injection molded resin gear comprising: a substantially cylindrical rim having teeth on an outer periphery thereof, said rim having a thickness (t 1 ) in radial directions; a hub for receiving therein a shaft; a web connecting said rim to said hub, said web having a thickness (t 2 ) in face width directions; and an annular circumferential rib formed on said web between said rim and said hub so as to protrude from said web concentrically with said rim and hub, said circumferential rib having a thickness (t 3 ) in radial directions, wherein a relationship between the thickness (t 1 ) of said rim, the thickness (t 2 ) of said web and the thickness (t 3 ) of the circumferential rib is t 1 ≦t 3 <t 2 .