| 摘要 |
PURPOSE:To improve the riding comfortableness by restricting the longitudinal and lateral vibrations of a driver's cab due to the vibration from a frame, and reducing the natural frequency of the driver's cab. CONSTITUTION:A swivel frame 21 and a driver's cab main body 22 are rotatably connected by a link mechanism 32 on the front side and rotatably connected via a hydraulic cylinder 35 on the rear side. A selector valve switching the feed/discharge position and the stop position of the pressure oil is provided in the middle of a pipe connecting the hydraulic cylinder 35 to a hydraulic pump and a tank. When the selector valve is set to the feed/discharge position, a piston is fixed to the tube 36 of the hydraulic cylinder 35, and a parallel link is formed with the hydraulic cylinder 35 and the link mechanism 32. When the selector valve is set to the stop position, the expanding/shrinking action of the rod 38 of the hydraulic cylinder 35 is allowed, and it elastically supports the driver's cab main body 22 on the swivel frame 21 together with lower cushioning supporters 25.
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