Patent ID: 6938722

Claim:
An electric power steering apparatus comprising an electric motor for producing a steering assist force, further comprising: a speed reducing mechanism for decelerating a rotation of a rotatable shaft in the electric motor; and a converting mechanism for converting an output rotation of the speed reducing mechanism into an axial movement of a steering shaft extending toward right and left sides of a vehicle, the speed reducing mechanism comprising an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley, and means for adjusting a tension of the belt; wherein the means for adjusting the tension includes means for changing a center-to-center distance between the input pulley and the output pulley; wherein the means for changing the center-to-center distance includes a guiding mechanism for relatively guiding the first housing for holding the input pulley and the second housing for holding the steering shaft in a predetermined guiding direction in which the center-to-center distance can be changed; and wherein the predetermined guiding direction includes a direction perpendicular to a plane including center lines of the input pulley and the output pulley.