PURPOSE: To reduce the rotational radius of an electrical vehicle by an arrangement wherein the arms to be fixed with pins of a driving wheel are coupled rotatably through a connecting rod and relative rotational speed of the driving wheel is made variable.

CONSTITUTION: The stator unit 16 of a motor is fixed to the motor frame with the shaft 13 being set in the center. The shaft is fixed rotatably with the hub 14 of wheel through a tapered rolling bearing 15. On the other hand, the rotor is fixed to the outside diameter section of the hub 14. The hub 14 is fixed, to the other end thereof, with a rim through a planted bolt 22 and a nut 23 and a tire is fixed to the outer circumferential part of the rim. Furthermore, pins 28, 29 are inserted into protrusions 26, 27 and bushes 1a, 1b. The pin 29 is secured to an arm 32 and the pins of facing wheels are coupled through a connecting rod 34. At the time of rotation, the coupling rod is driven and relative rotational speed of the driving wheel is varies.