Patent ID: 8919489

Claim:
An electric power steering apparatus comprising: a steering shaft through which a steering torque is transmitted; an electric motor for transmitting a steering assist force to the steering shaft via a reduction mechanism in a reduction gearbox; a control unit including a control substrate on which a control circuit for drive-controlling the electric motor is mounted; a plurality of sensor terminals connected to a torque sensor included in the reduction gearbox and protruding from an outer circumference of the reduction gearbox; a plurality of through holes arranged at the control substrate; and a plurality of connection terminals electrically connecting the plurality of sensor terminals and the plurality of through holes, respectively, wherein the control unit includes a frame of synthetic resin for holding the control substrate, the frame of synthetic resin partially insert-molds the plurality of connection terminals with first ends of the plurality of connection terminals connected to the plurality of through holes, and second ends of the plurality of connection terminals protruding at the outside of the frame of synthetic resin, wherein the frame of synthetic resin includes a sensor terminal holding portion having guide openings arranged at positions opposing open ends of the plurality of sensor terminals, the control unit is mounted on the reduction gearbox with the open ends of the plurality of sensor terminals being inserted into the guide openings, and the second ends of the plurality of connection terminals and the open ends of the plurality of sensor terminals are respectively connected by soldering together, the second ends of the connection terminals: i) are separated from the sensor terminal holding portion by a certain gap, and ii) face the sensor terminal holding portion, deformation preventing members configured to prevent the second ends of the connection terminals from deforming with the gap are provided, and the deformation preventing members are leg portions provided at side faces of the second ends, respectively, and the leg portions abut a wall of the sensor terminal holding portion to prevent the second ends of the connection terminals from deforming.