| 摘要 |
PROBLEM TO BE SOLVED: To reduce the noise level caused by the vibration inside a nailing stock by suppressing the vibration attributable to the unbalance of a driving system in a truck for the rolling stock. SOLUTION: A container 83 of a vibration damping device 80 is fixed to a suspension rod 60 suspending a reduction gear 32 for rotating a wheel by a horizontal beam 13 of a truck frame 10. Lead granules 81 are placed in the container 83. A rubber sheet 86 is arranged between the container 83 and the suspension rod 60. The rotational vibration generated from the driving system of a motor 41 for traveling, the reduction gear and a shaft coupling is transmitted to the suspension rod 60. The vibration energy generated in the suspension rod 60 is converted into the dynamic energy of the granules 81 by the collision of the granules 81 in the container 80, and the vibration in the suspension rod 60 is reduced. Thus, propagation of the vibration to the rolling stock body can be suppressed. The dynamic vibration absorbing effect is obtained by the rubber sheet 86.
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