Side frame-bolster interface for railcar truck assembly
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United States of America Patent
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-
Jan 16, 2001
Grant Date -
N/A
app pub date -
Aug 20, 1998
filing date -
Aug 20, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An interface between the end of a bolster and a side frame column for a three-piece railcar truck assembly is disclosed. The bolster and side frame have several pairs of facing stop surfaces at the interface. Each pair of facing stop surfaces are at two different spacings: one spacing is close, with a small gap between the stop surfaces; another spacing is greater than the first. The second spacing allows the side frame to pitch with respect to the bolster transverse axis. The bolster stop surfaces may be the lands inboard and outboard of the friction shoe pockets. The lands may be shaped so that there is a raised warp control portion or surface and one or more relief portions or surfaces, the warp control portion extending farther laterally than the relief portions. The warp control portion is used to maintain the truck in a square relationship, and the more loosely spaced relief portions allow for side frame articulation as the truck traverses track at different elevations. The raised warp control portions and reliefs may alternatively or also be formed on the side frame lands or wear plates.
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