Patent ID: 7562601
Filing Date: 2009-07-21
Classification: B62D,F16H,Y10S,Y10T

Abstract:
1. A worm wheel comprising: an annular metallic core portion; and an annular rim portion comprising a resin which is molded with the core portion inserted thereinto, wherein the core portion includes an undercut portion, wherein the rim portion includes a main body portion which covers an outer circumference of the core portion and in which a toothed portion is formed on an outer circumference thereof and a pair of annular flanges which extend radially inwards from the main body portion so as to cover outer edge portions of the pair of side surfaces of the core portion, respectively, wherein at least one of the pair of annular flanges is engaged with the undercut portion, wherein the undercut portion is formed at a corner disposed between a radially outer portion of at least one of the pair of side surfaces of the core portion and an outer circumference of the core portion opposed to the main body portion of the rim portion, wherein a depth of the undercut portion of the core portion increases as it extends further in a radially inward direction, and wherein an outer circumference of the core portion comprises an involute spline.