Railcar truck roller bearing adapter-pad systems
AssigneeNevis Industries LLC
InventorsErik Gotlund, Jon R. Jeambey, F. Andrew Nibouar, James A. Pike, Jason C. Bryant, Jonathan A. Stull, William A. Kurtzhals, Roshan N. Manibharathi
Life of this patent
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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.
Claims19
A roller bearing adapter pad system configured for use with a three-piece truck comprising:
- a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
- a top surface;
- and
- a bottom surface configured to engage a roller bearing;
- wherein the roller bearing adapter has cross-sectional moment of inertia of a cross-section at the longitudinal centerline of the roller bearing adapter around a lateral axis about 5.9 inches above a center axis of an axle that is in the range of about 1.0 in4 to about 2.0 in4;
- wherein the roller bearing adapter has a cross-sectional moment of inertia of a cross-section at the longitudinal centerline of the roller bearing adapter around a vertical axis at the center of the adapter that is in the range of about 75 in4 to about 125 in4;
- and
- an adapter pad configured to engage a side frame pedestal roof, the adapter pad comprising:
- a top plate;
- a bottom plate;
- and
- an elastomeric member disposed between the top plate and bottom plate;
- wherein the adapter pad has a pad elastomer shear width of about 6 in to about 14 in and a pad elastomer shear length of about 6 in to about 10 in.
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.
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 system comprising:
- an adapter pad comprising:
- a top plate;
- a bottom plate;
- and
- an elastomeric member disposed between the top plate and bottom plate;
- 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.