| 摘要 |
A composite constant contact side bearing for railroad cars that comprises a body, that may be either cage mounted or free mounted, having a top wall that supports the car body bolster, a bottom wall structure that is to be supported by the truck bolster, oppositely facing side walls that extend the length of the body, and oppositely facing end walls that extend normally of the body side walls, with the body comprising a rigid filler block enclosed within a polyurethane casing that defines the body top wall, end walls, and side walls, with the filler block being of generally quadrilateral parallelepiped configuration, but defining a depending stud from its underside that protrudes from the polyurethane casing below the filler block. The filler block and stud are of one piece hollow or solid metallic construction, while the casing is of a single density polyurethane composition molded on the filler block with the orientation that the portions of same that define the body top wall, end walls and side walls are of relatively thin thickness dimensions, while below the filler block, the casing defines beneath either end of the filler block a resilient pad portion that project below the filler block in excess of the projection of the stud therefrom, with the polyurethane casing defining the compressive travel of the side bearing and the steel block and its depending stud limiting such travel.
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