Electric power steering apparatus and method of manufacturing gear used therefor

摘要

The support body engaged with the interior side of the tooth body provided at the worm wheel (8) of the electric power steering apparatus comprises: a corrugated cylinder part (83) press-formed to have a plurality of concavities (82g) on the exterior side thereof and convexities (82h) to the interior formed by said concavities (82g) which are arranged in a peripheral direction; and a plate part (84) an exterior edge of which is united with an end of said corrugated cylinder part (83), wherein the tooth body (81) is engaged with the exterior side of the corrugated cylinder part (83). With the method of manufacturing the gear (8), synthetic resin of the tooth body (81) can be deposited uniformly on the support body (82) made of metal engaged with the interior of the tooth body (81), costs can be reduced, and the support body (82) can be engaged with the tooth body (81) without generating voids and weld marks.