Patent ID: 7413051

Claim:
An electric power steering apparatus comprising: an electric motor; a rack shaft connected to a steering mechanism and arranged in parallel with an axis line of the electric motor; and a power transmitting mechanism for transmitting a power from the electric motor to the rack shaft, wherein the power transmitting mechanism includes: a screw shaft connected or integrated to the rack shaft and having a male screw groove; a nut arranged at a surrounding of the screw shaft and having a female screw groove; and a plurality of rolling members rotatable in a rolling path formed between the male screw groove and the female screw groove, and the nut includes: a main body provided with a receiving portion for receiving the power transmitted from the electric motor on an outer side in a radius direction of the rolling path and provided with a circulating path of the rolling member extended in an axis line direction; and end caps, each of which is constituted by only one part, respectively provided at both ends of the main body along a longitudinal axis of the nut with respect to a mount portion machined parallel to the longitudinal axis of the nut, and provided with paths for connecting the rolling path and the circulating path.