Railcar Truck Roller Bearing Adapter-Pad Systems
AssigneeNevis Industries LLC
InventorsErik L. Gotlund, Jon R. Jeambey, F. Andrew Nibouar, James A. Pike, Jason C. Bryant, Jonathan A. Stull, William A. Kurtzhals, Roshan N. Manibharathi
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Abstract
A railcar truck and adapter pad system for placement between a roller bearing and side frame pedestal roof of a three-piece railcar truck. Many different features of the pad and/or the adapter-pad interface are configured to improve stiffness characteristics to satisfy both curving and high speed performance of the railcar truck.
Claims1
A roller bearing adapter pad system configured for use with a three-piece truck having a roller bearing adapter and a side frame pedestal roof, the roller bearing adapter pad system comprising:
- an adapter pad comprising:
- a top plate;
- a bottom plate;
- and
- an elastomeric member disposed between the top plate and bottom plate,
- the elastomeric member comprising a center elastomer layer;
- and
- wherein the center elastomer layer has a shear perimeter of about 20 in. to about 35 in;
- and
- wherein the combined top plate, bottom plate, and elastomeric member provide a longitudinal stiffness of at least 45,000 pounds per inch through a longitudinal displacement of the top plate relative to the bottom plate of up to 0.139 inches from a central position, a lateral stiffness of at least 45,000 pounds per inch through a lateral displacement of the top plate relative to the bottom plate of up to 0.279 inches from the central position, and a rotational stiffness of at least 250,000 pound*inches per radian of rotation through a rotational displacement of the top plate relative to the bottom plate of up to 54.4 milliradians from the central position when a vertical load of 35,000 pounds is applied to a central portion of the adapter pad.
Dependencies are inferred from the claim text.