| 摘要 |
A planet gear mechanism 19 interposed between a steering 2 and steerable wheels 4L and 4R is interposed. A torque controlling motor 25 for controlling a torque acting on the steering 2 and a transmission-rate varying motor 20 for driving the planet gear mechanism 19 are arranged coaxially (on an axial A) with the planet gear mechanism 19. This eliminates the need for arranging each motor 20 and 25 on the both ends of the axis A to face each other, and also reduces a space occupied by the motors 20 and 25 with respect to a radial direction of the axis A. As a result, reduction in the size of an apparatus can be achieved.
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