Rail road car truck with bearing adapter and method

摘要

A swing motion rail road freight car truck is provided that has a truck bolster and a pair of side frames, the truck bolster being mounted transversely relative to the side frames. The side frames have spring seats for the groups of springs. The springs seats may be rigidly mounted in the side frames. Friction dampers are provided in inboard and outboard pairs. The biasing force on the dampers urges then to that act between the bolster ands and sideframes to resist parallelogram deflection of the truck. The bearing adapters and sideframe pedestal seats interact on a rolling linear contact interface that has a relatively small radius of curvature.

主权项

1. A process of retro-fitting a three piece rail road freight car truck, the process comprising:
starting with a truck to be retro-fit, that truck having:
a pair of first and second sideframes, and first and second sets of wheels and axles,a truck bolster resiliently mounted transversely to said sideframes, the truck bolster having a first end mounted to said first sideframe, and a second end mounted to said second sideframe,said sideframes being mounted on said axles,said axles having bearings mounted thereto and first bearing adapters mounted to said bearings,said sideframes having bearing pedestal mounts,said first bearing adapters being rockingly engaged with said bearing pedestal mounts to permit lateral swinging of said sideframes,each said first bearing adapter having a crowned surface in rolling contact rocking engagement to a mating bearing surface of said bearing pedestal mounts; extracting said first bearing adapters from said truck; and replacing said first bearing adapters with second bearing adapters having a crowned surface having a smaller radius of curvature than before.