Patent ID: 9707992
Date: 2017-07-18
CPC Classifications: B62D,F16H,Y10T

Claim:
1. A worm wheel comprising: a metal hub, and a gear portion formed by a synthetic resin; the hub comprising: an installation hole provided in a center portion of the hub, and in which a rotating shaft is fitted and fastened inside; a first annular concave portion provided in a portion on one surface in an axial direction of the hub; a second annular concave portion provided in a portion near an outer diameter of the hub; and concave and convex portions provided in a circumferential direction of the hub around the outer circumferential edge portion of the hub; wherein the synthetic resin of the gear portion covers an entire circumference of an outer-diameter side end portion of the hub; and an inner circumferential edge portion of the synthetic resin of the gear portion that is located on the one surface side in the axial direction of the hub fills inside a portion near the outer diameter of the first annular concave portion, and part of the synthetic resin of the gear portion also fills the second annular concave portion.