| 摘要 |
PROBLEM TO BE SOLVED: To provide a shock damping device which damps a shock imposed at the time of starting/stopping a rolling vehicle. SOLUTION: When the rolling vehicle is started, pressure oil is supplied from a hydraulic pump 3 via a supply-side main circuit 5 to hydraulic motors 7, 12, 13 in a stopping state. In this state, however, a little of the pressure oil is led from the main circuit 5 to a restriction 27 by which flow of the pressure oil is squeezed, and directly returned to a low-pressure main circuit 10. Therefore the hydraulic motors 7, 12, 13 are smoothly rotated from their stopping state, so that a roller 6 and rolling wheels 18, 19 driven by the respective hydraulic motors 7, 12, 13 smoothly start rolling from their stopping state. Therefore the rolling vehicle 2 starts in a shockless manner, and smoothly starts laying and leveling of a soft asphalt surface. At the time of stopping, a little of the pressure oil flows between the restriction 27 and each of the hydraulic motors 7, 12, 13, so that the hydraulic motors 7, 12, 13 are not suddenly stopped, which leads to ease of a shock at the time of stopping the vehicle. COPYRIGHT: (C)2004,JPO
|
