| 摘要 |
PROBLEM TO BE SOLVED: To reduce a burden of a front wheel, prevent uneven wearing of a tire between rear front/rear axles, by mounting the rear front axle turnably also connecting to a front wheel steering power steering device, and individually controlling brake force of a wheel in both sides, so as to generate turning moment in the rear front axle. SOLUTION: A differential gear device is mounted with a rear front axle 18 as a drive shaft, the rear front axle 18 is mounted right/left turnably with a rear rear axle as a fixed shaft. The rear front axle 18 is connected to a front wheel steering power steering device, the rear front axle is steered with a front wheel. Brake force of right/lift wheels 17 of the rear front axle is separately controlled, the rear front axle is turned by a difference between the brake forces. The power steering device is thus rotated, so as to right/left turn the rear front axle 18 via a drag link in a rear side. This turning action is assisted by a hydraulic cylinder 45. As a result, a tire of a rear front wheel 17 causes no uneven wearing, to enlarge between the rear front axle 18 and the rear rear axle, most of a load can be received. |
