| 摘要 |
A rail road freight car truck has a truck bolster and a pair of side frames, the truck bolster being mounted transversely relative to the side frames. The mounting interface between the ends of the axles and the sideframe pedestals allows lateral rocking motion of the sideframes in the manner of a swing motion truck. The lateral swinging motion is combined with a longitudinal self steering capability. The self steering capability may be obtained by use of a longitudinally oriented rocker that may tend to permit resistance to deflection that is proportional to the weight carried across the interface. The truck may have auxiliary centering elements mounted in the pedestal seats, and those auxiliary centering elements may be made of resilient elastomeric material. The truck may also have friction dampers that have a disinclination to stick-slip behavior. The friction dampers may be provided with brake linings, or similar features, on the face engaging the sideframe columns, on the slope face, or both. The friction dampers may operate to yield upward and downward friction forces that are not overly unequal. The friction dampers may be mounted in a four-cornered arrangement at each end of the truck bolster. The spring groups may include sub-groups of springs of different heights. |
| 主权项 |
1. A rail road car truck comprising:
a truck bolster mounted transversely between a pair of first and second sideframes, said truck bolster having first and second ends, each of said first and second sideframes having a sideframe window into which a respective one of said first and second ends of said bolster is received; a first spring group, said first spring group being mounted in said window of said first sideframe, said first spring group including a first array of side-by-side coil springs upon which said first end of said truck bolster is carried; a second spring group, said second spring group being mounted in said window of said second sideframe, said second spring group including a second array of side-by-side coil springs upon which said second end of said truck bolster is carried; said first sideframe having a first end and a first pedestal fitting defined thereat, said first pedestal fitting including a pair of first and second opposed pedestal jaw thrust lugs and a pedestal roof; said second sideframe having a first end and a first pedestal fitting defined thereat, said second pedestal fitting including a pair of first and second opposed pedestal jaw thrust lugs and a pedestal roof; said sideframes being mounted on wheelsets, said wheelsets including a first wheelset, said first wheelset having an axle; said axle having a first end and a second end; said wheelset having first and second bearings mounted on said first and second ends thereof, said bearings having substantially cylindrical bearing casings; said first bearing being mounted in said first sideframe pedestal fitting of said first sideframe and said second bearing being mounted in said first sideframe pedestal fitting of said second sideframe; a first bearing adapter and a second bearing adapter, said first bearing adapter being mounted upon the casings of said first and second bearings respectively; each of said bearing adapters having a pair of axially spaced arches, longitudinally spaced end walls and pairs of corner abutments, said pairs of corner abutments being axially spaced to bracket respective ones of said thrust lugs, and each of said end walls of each said bearing adapter extending axially between a respective one of said pairs of said corner abutments; said first sideframe being mounted to yaw appreciably relative to said truck bolster, and said second sideframe being mounted to yaw appreciably relative to said truck bolster; a first elastomeric pad member mounted to overlie at least a portion of said first bearing adapter between said first bearing adapter and said first sideframe pedestal roof of said first sideframe; an second elastomeric pad member mounted to overlie at least a portion of said second bearing adapter between said second bearing adapter and said first sideframe pedestal roof of said second sideframe; and a first set of friction dampers mounted to work between said first end of said truck bolster and said first sideframe; a second set of friction dampers mounted to work between said second end of said truck bolster and said second sideframe; said first set of dampers including a first damper and a second damper; said first damper and said second damper being driven independently of each other; and said first damper being mounted transversely inboard of said second damper; and said truck bolster has a range of lateral travel relative to said sideframes, said range of lateral travel being governed by bolster gibs, and said bolster gibs are spaced to permit at least 1⅛ inches of lateral travel of said bolster relative to said sideframes to either side of a neutral position.
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