Side frame-bolster interface for railcar truck assembly

摘要

A three-piece railcar bogie assembly comprising two side frames (103, 105) and a bolster (16) extending between the side frames (103, 105). Each side frame (103, 105) has spaced columns defining an opening which receives one end of the bolster (16). Each side frame (103, 105) also has forward and rearward lugs (54, 55, 100, 102) at the columns, both on the inboard side and the outboard side. Each side frame lug has a stop surface that is aligned in a facing relationship with a stop surface of one bolster gib (50, 51, 52, 53). There is a gap between the opposed side frame lug and bolster gib stop surfaces. The gap distance is limited to limit the bogie warp angle. The neighboring side frame lugs and bolster gibs may be sized, shaped and spaced so that the bogie warp angle may be limited to an angle of less than two degrees. The various stop-surfaces may be hardened to a desirable range of hardness over at least the contact portion of either contacting lug or gib, or both contacting surfaces may be hardened above the as-cast hardness. IMAGE