Patent ID: 9669846
Date: 2017-06-06
CPC Classifications: B61F,Y10T

Claim:
1. A railcar truck comprising: a three-piece truck comprising: a first wheelset engaged with a first roller bearing and engaged with a second roller bearing; a second wheelset engaged with a third roller bearing and engaged with a fourth roller bearing; a first roller bearing adapter having AAR standard thrust lug clearances engaged with the first roller bearing, a second roller bearing adapter having AAR standard thrust lug clearances engaged with the second roller bearing, a third roller bearing adapter having AAR standard thrust lug clearances engaged with the third roller bearing, and a fourth roller bearing adapter having AAR standard thrust lug clearances engaged with the fourth roller bearing each roller bearing, each roller bearing adapter symmetrical about a lateral centerline and symmetrical about a longitudinal centerline, and defining a bottom surface and a crowned top surface, the top surface defining opposing first and second vertical shoulders that project upwardly from the top surface on either side of the side frame; a first adapter pad engaged with the first pedestal roof and the first roller bearing adapter, a second adapter pad engaged with the second pedestal roof and the second roller bearing adapter, a third adapter pad engaged with the third pedestal roof and the third roller bearing adapter, a fourth adapter pad engaged with the fourth pedestal roof and the fourth roller bearing adapter, each adapter pad comprising: wherein the top plate and bottom plate central portions and the central elastomeric member of each adapter pad are disposed at least in part beneath the engaged pedestal roof, and the first and second laterally projecting flanges of the top plate and the bottom plate and the first and second outer elastomeric members of each adapter pad are entirely disposed above the vertical shoulders of the engaged roller bearing adapter and outside of the engaged pedestal roof; wherein the combined top plate, bottom plate, and elastomeric members of each of the adapter pads 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 0.234 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 bottom plate 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.