POWER TRANSMISSION DEVICE, ELECTRIC POWER STEERING DEVICE, AND METHODS OF PRODUCING THE SAME

摘要

A power transmission device(10)for an electric power steering device(1)intended to achieve reduced cost,small size,weight reduction,and responsiveness during power transmission and to prevent occurrence of noise,comprises a motor section(5)having a rotary shaft(7),a rotor(51)attached to the base end side(7a)of the rotary shaft(7),and a stator(52)disposed in opposed relationship to the rotor(51),a worm gear(61)attached to the front end side(7b)of the rotary shaft(7)as seen from the motor section(5),and a wormwheel gear(62)meshing with this gear(61).The rotary shaft(7)is rotatably supported on the front end side(7b)as seen from the worm gear(61)by a first bearing(81)and a second bearing(82)held in a housing(4).The second bearing(82)is held in the housing(4)between the worm gear(61)and the rotor(51)in such a manner as to cooperate with the first bearing(81)to hold the worm gear(61)therebetween.