| 摘要 |
PROBLEM TO BE SOLVED: To improve the traveling property even in traveling on a largely undulated road surface, and to stabilize the posture of a vehicle even in starting the vehicle, or in a traveling braking. SOLUTION: A hub 20 is provided on a tip side of a drive shaft 17 of a front axle 13 through a reduction gear, etc., and a drive wheel 22 is integratedly provided on the hub 20. A boss part 23B of an oscillation bracket 23 is relatively rotatably mounted on an outer circumferential side of the hub 20, and a plurality of rolling elements 24 are rotatably provided on the oscillation bracket 23. A crawler 25 is wound between the drive wheel 22 and each rolling element 24. An arm part 16A is integratedly formed on a lower surface side of a knuckle 16 forming a part of an axle housing 14, and a cylinder device 26 is provided between the tip side of the arm part 16A and the oscillation bracket 23 in an expandable manner. When a vehicle is started or braked, the oscillation of a crawler device 21 is stopped by stopping the expansion of the cylinder device 26.
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