To improve riding comfort by effectively damping vibrations and oscillation at a specified frequency of a truck generated during driving rolling stock.
An axle spring damper 14 fixes a vibration-proof rubber part 16 to the lower surface of a metallic lower side seating part 15. While fluid chambers 19, 20 are formed in the lower side seating part 15 and the vibration-proof rubber part 16 respectively, communicating between the respective fluid chambers 19, 20 with a fluid channel 22 having an orifice 21. When the vibration-proof rubber part 16 is pressed under load, the fluid sealed in the fluid chamber 20 provided in the vibration-proof rubber part 16 is forced to the fluid chamber 19 provided in the lower side seating part 15 through the fluid channel 22 to dampen the vibrations. Changing the setting of the cross-sectional area of the fluid channel 20, its length and the cross-sectional area of the orifice 21 or the like generates fluid resonance at a specified frequency, enabling the vibrations at the specified frequency to be effectively damped.
| WO/2005/005219 | RAIL ROAD CAR TRUCK AND MEMBERS THEREOF |
Toshio Nakamura
Miyazaki Yoshio
Kaoru Onozuka
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