| 摘要 |
<p>A vehicle drive device comprises a support (7) fixed to a chassis of the vehicle, a moving carrier (2) holding a drive motor (1), a gear box (3) of the drive motor, bearings and a roller (4), wherein the drive motor, the gearbox, the bearings and the roller are connected to each other in sequence to drive the roller to rotate, and the roller can act upon a tyre (5) of the vehicle to rotate the wheel of the vehicle by the rotary movement of the roller. The vehicle drive device further comprises a servo-drive device (9) connected to a moving carrier through a linkage (8) to drive the moving carrier to move along a circular arc-shaped path, so that the roller can be shifted between a rest position and an operating position. The vehicle drive device according to the present invention drives the moving carrier to move along a circular arc-shaped path so that the roller moves toward the wheel (the tyre) of the vehicle along a circular arc-shaped path which is located in a plane extending substantially perpendicularly to the axis of rotation of the wheel of the trailer when the auxiliary drive unit is mounted on a trailer. This will cause the roller to press against the tyre from an obliquely downward direction, effectively increasing the pressing force to the tyre.</p> |
