| 摘要 |
In accordance with the present invention a railway car truck is provided including a pair of transversely spaced side frames and a transom which is attached solely to the side frames with a rigid connection to define an integral H frame to maintain the side frames parallel and resist truck hunting. The transom has a cross section which provides torsional flexibility which allows the side frames to rock relative to one another. Above the transom a bolster is provided which extends transversely between the side frames and rests upon spring assemblies mounted in openings in the side frames. The weight of the car body is by car body bearing assemblies mounted on the bolster above the spring assemblies. A bolster center bearing is provided which engages the car body and transmits substantially all horizontal loads from the car body through the bolster to the side frames. The spring assemblies may include two components in which one component has a resultant low spring rate which at all times in traversing ordinary track transmits the weight of the car body to the side frames, and another component having a resultant high spring rate which functions when rough track is traversed to transmit the weight of the car body to the side frames from where the weight is transmitted to the wheels to maintain the wheels on the track while the rough track is being traversed. |
