An electric power steering device in which a motor shaft and a rack bar form a
diagonal intersection. The power transmission includes: a drive gear rotating in
tandem with the motor shaft and forming a bevel gear with linearly extending teeth;
a ball screw mechanism disposed co-axial with the rack bar and converting a rotational
motion to a linear motion; and a driven gear rotating in tandem with a nut of the
ball screw mechanism, meshing with and moving in tandem with the drive gear, and
forming a bevel gear with linearly extending teeth. The drive gear and/or the driven
gear can be adjusted so that backlash between the two elements can be adjusted
in a continuous, non-stepped manner.
