Patent ID: 9270145
Filing Date: 2016-02-23
CPC Classification: H02K

Claim Text:
1. An electric power steering device having a motor that generates a power output for assisting a steering power transmitted from a driver, the electric power steering device comprising: a first housing and a second housing, which are respectively provided at both end portions in an axial direction of a stator of the motor, for sandwiching the stator; and a movement suppressing means for preventing the sandwiched stator from moving in a circumference direction of the stator with respect to the first housing and the second housing; a control unit which has a driving circuit for driving the motor, a control board for outputting control signals to the driving circuit, and a heat sink for heat dissipation; wherein at least one of the first housing and the second housing includes an annular shaped concave portion which is formed on an inner periphery of the at least one of the first housing and the second housing, and the at least one of the first housing and the second housing is fitted to a portion of the stator by fitting an end edge of the stator into the annular shaped concave portion of the at least one of the first housing and the second housing, the first housing and the second housing are pressed, in a direction where they are approached to each other, by a fixing member via the heat sink, the movement suppressing means is provided at the fitted portion of the stator, and contacts on a part of the stator, and on at least one of the first housing and the second housing, in the circumference direction of the stator directly or indirectly, and suppresses that stator moves in the circumference direction of the stator, and the stator, the first housing, the second housing, and the control unit are juxtaposed in the axial direction of the stator, and are fixed to each other, wherein the movement suppressing means is composed of a first concave groove formed at the outer circumferences of the end edge of the stator in the axial direction of the stator, a second concave groove formed at the inner circumference surfaces of the annular shaped concave portion of the at least one of the first housing and the second housing in the axial direction of the stator, and a pin engaged to the first concave groove and the second concave groove or the movement suppressing means is composed of a first concave portion or a first convex portion, which are formed at the outer circumferences of the end edge of the stator, and are extended in the axial direction of the stator, and a second convex portion or a second concave portion, which are formed at the inner circumferences of the annular shaped concave portion of the at least one of the first housing and the second housing, and are extended in the axial direction of the stator and fitted to the first concave portion or the first convex portion.