Railcar truck roller bearing adapter pad systems

A roller bearing adapter pad system configured for use with a three-piece truck having AAR standard geometry comprising:

• a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
• a top surface;
• a bottom surface configured to engage a roller bearing;
• an adapter pad engaged with the roller bearing adapter and configured to engage a side frame pedestal roof, the adapter pad comprising:
• a continuous top plate
• an elastomeric member disposed between the top plate and the top surface of the roller bearing adapter;
• wherein the elastomeric member is bonded to the top plate and the top surface of the roller bearing adapter;
• and
• wherein the combined adapter, top 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 adapter 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 adapter of up to 0.234 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 adapter of up to 41 milliradians from the central position when a vertical load of 35,000 pounds is applied to the central portions of the adapter pad.

A roller bearing adapter pad system configured for use with a three-piece truck having AAR standard geometry comprising:

• a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
• a top surface;
• a bottom surface configured to engage a roller bearing;
• an adapter pad engaged with the roller bearing adapter and configured to engage a side frame pedestal roof, the adapter pad comprising:
• an elastomeric member with a top surface configured to engage a side frame pedestal roof, and a bottom surface engaged with the top surface of the roller bearing adapter,
• wherein the elastomeric member is bonded to the top surface of the roller bearing adapter;
• and
• wherein the combined adapter and elastomeric members provide a longitudinal stiffness of at least 45,000 pounds per inch through a longitudinal displacement of the side frame relative to the adapter 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 side frame relative to the adapter of up to 0.234 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 side frame relative to the adapter of up to 41 milliradians from the central position when a vertical load of 35,000 pounds is applied to the central portions of the adapter pad.

A roller bearing adapter pad system configured for use with a three-piece truck having AAR standard geometry comprising:

• a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
• a crowned top surface;
• a bottom surface configured to engage a roller bearing;
• first and second vertical shoulders projecting upwardly from opposite lateral edges of the top surface;
• an adapter pad engaged with the roller bearing adapter and configured to engage a side frame pedestal roof, the adapter pad comprising:
• a continuous plate disposed between the side frame pedestal roof and roller bearing adapter top surface
• a plurality of elastomeric members disposed between the side frame pedestal roof and roller bearing adapter top surface,
• wherein the plurality of elastomeric members are bonded to the continuous plate and positioned to shear under displacement of the side frame relative to the roller bearing adapter
• wherein the adapter pad provides a longitudinal stiffness of at least 45,000 pounds per inch through a longitudinal displacement of the side frame relative to the adapter 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 side frame relative to the adapter of up to 0.234 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 side frame relative to the adapter of up to 41 milliradians from the central position when a vertical load of 35,000 pounds is applied to the central portions of the adapter pad.

A roller bearing adapter pad system configured for use with a three-piece truck having AAR standard geometry comprising:

• a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
• a crowned top surface;
• a bottom surface configured to engage a roller bearing;
• an adapter pad engaged with the roller bearing adapter and configured to engage a side frame pedestal roof;
• a damper engaged with the roller bearing adapter at a first end and engaged with a side frame;
• wherein the damper is configured to dampen forces of a wheelset in the longitudinal direction.

A roller bearing adapter pad system configured for use with a three-piece truck having AAR standard geometry comprising:

• a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
• a crowned top surface;
• a bottom surface configured to engage a roller bearing;
• first and second vertical shoulders that project upwardly from opposite lateral edges of the top surface;
• an adapter pad engaged with the roller bearing adapter and configured to engage a side frame pedestal roof, the adapter pad comprising:
• a continuous top plate having a central portion, and first and second upturned regions projecting upwardly from opposite edges of the central portion;
• a continuous bottom plate having a central portion, and first and second upturned regions projecting upwardly from opposite edges of the central portion;
• a first outer elastomeric member disposed between the first upward projecting portions of the top and bottom plates;
• wherein the thickness of the adapter is no greater than 0.4 inches as measured at the longitudinal centerline from bottom surface to the crowned top surface of the roller bearing adapter.

A roller bearing adapter pad system configured for use with a three-piece truck having AAR standard geometry comprising:

• a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
• a crowned top surface;
• a bottom surface configured to engage a roller bearing;
• an adapter pad engaged with the roller bearing adapter and configured to engage a side frame pedestal roof, the adapter pad comprising:
• a continuous top plate having a central portion and first and second lateral edges;
• a continuous bottom plate having a central portion and first and second upturned regions projecting upwardly from opposite edges of the central portion;
• an elastomeric member disposed between the first lateral edge of the top plate and the first upturned region of the bottom plate, between the central sections of the top and bottom plates, and between the second lateral edge of the top plate and the second upturned region of the bottom plate;
• wherein a top surface of the top plate is raised above a top surface of the bottom plate;
• wherein the elastomeric member includes at least one substantially vertical section and at least one shim within the at least one substantially vertical section.