| 摘要 |
The truck of a railroad car or similar vehicle is provided with a hydraulic fluid single action piston and cylinder motion damping device located in each spring group, between the spring seat and the truck bolster. The device is provided with unvalved passages by means of which hydraulic fluid is by-passed around the piston head. As a consequence, the piston is capable of yielding to accommodate movement of the truck bolster regardless of the magnitude of the load applied by the truck bolster to the piston. The device is also provided with valved passages through which hydraulic fluid flows back and forth between a compression chamber and a reservoir in response to actuation of the piston.
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