Patent ID: 6889795

Claim:
An electric power steering device comprising: a rack bar converting a rotational motion of a steering shaft to a longitudinal, linear motion and changing a steering angle; a motor rotationally driving a motor shaft based on a steering torque generated by said steering shaft, said motor shaft forming a diagonal intersection with said rack bar; and drive transmission means transmitting a rotational drive from said motor shaft to said rack bar as an auxiliary propulsion force; said drive transmitting means comprising: a drive gear rotating in tandem with said motor shaft and formed as a bevel gear with linearly extending teeth; a ball screw mechanism disposed co-axial with said rack bar and converting rotational motion to linear motion; and a driven gear rotating in tandem with a nut of said ball screw mechanism, meshing with and moving in tandem with said drive gear, and formed as a bevel gear with linearly extending teeth; and backlash for said drive gear or said driven gear or backlash between said drive gear and said driven gear can be adjusted in a continuous, non-stepped manner.