Patent ID: 8863888
Filing Date: 2014-10-21
Classification: B62D,H02K

Abstract:
1. An electric power steering device comprising: a steering column including a steering shaft in the steering column, the steering column transmitting steering torque; an electric motor for transmitting a steering assist force via a worm speed reduction mechanism in a speed reduction gear box to the steering shaft; a control unit for driving the electric motor; and a motor mounting part provided in the speed reduction gear box, the electric motor being mounted on the motor mounting part, a motor shaft of the electric motor being joined to a worm meshed with a worm wheel of the worm speed reduction mechanism, wherein the electric motor includes a motor case formed in a cylindrical shape and having an open end to include a motor rotation part in the motor case, and a substantially disc-shaped flange member linked to the motor case so as to cover the open end of the motor case, the flange member is provided with two mounting flanges and at least one first abutting flange at uneven interval in a circumferential direction of the flange member, the two mounting flanges being outwardly swollen and fixed to the motor mounting part, and the first abutting flange being outwardly swollen between the two mounting flanges and abutting to the motor mounting part, and a minute projection is provided at one abutting surface out of a first abutting surface of the first abutting flange and a second abutting surface of the motor mounting part, the second abutting surface abutting to the first abutting surface, the minute projection locally abutting to the other abutting surface out of the first abutting surface and the second abutting surface.