| 摘要 |
PROBLEM TO BE SOLVED: To support a load by two rear free rotating wheels when front free rotating wheels ride over an obstacle such as a stone and reduce vertical vibration. SOLUTION: A truck frame 2 is swingably supported on the rear axle case of a traveling machine frame through a swing shaft 8. Front and rear driven wheels 3, 4 are disposed at the front and rear ends of the truck frame 2, respectively. The longitudinal three wheels of free rotating wheels 5 are installed at the intermediate part of the truck frame. A drive wheel 6 to which a power is transmitted from a rear axle 33 supported on a rear axle case is disposed in the longitudinally intermediate upper part of the truck frame 2. A crawler 7 is wrapped around the drive wheel 6, the front and rear driven wheels 3, 4, and the free rotating wheels 5. The rear two wheels of the free rotating wheels 5 are pivotally supported on an equalizer link 20. The longitudinal intermediate part of the equalizer link 20 is pivotally supported on the truck frame 2 through a pivot shaft 22. COPYRIGHT: (C)2008,JPO&INPIT
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