| 主权项 |
1. 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, each vertical shoulder having a width of at least 0.5 inches;first and second longitudinal stops that project upwardly from opposite longitudinal edges of the top surface;wherein the roller bearing adapter is symmetrical about a lateral centerline and symmetrical about a longitudinal centerlinewherein the thickness of the roller bearing adapter measured between the crowned top surface and the bottom surface is less than 0.75 inches as measured at the longitudinal centerline;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 5.2 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 50 in4 to about 100 in4; 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, first and second upturned regions projecting upwardly from opposite edges of the central portion, a first lateral flange projecting outwardly from the first upturned region, and a second lateral flange projecting outwardly from the second upturned region;a continuous bottom plate having a central portion, first and second upturned regions projecting upwardly from opposite edges of the central portion, a first lateral flange projecting outwardly from the first upturned region, and a second lateral flange projecting outwardly from the second upturned region;a first outer elastomeric member disposed between the first lateral flanges of the top and bottom plates, having a static thickness within the range of 0.15 inches to 0.30 inches;a second outer elastomeric member disposed between the second lateral flanges of the top and bottom plates, having a static thickness within the range of 0.15 inches to 0.30 inches;a central elastomeric member disposed between the central portion of the top and bottom plates, having uniform thickness, having a substantially uniform static thickness within the range of 0.15 inches to 0.25 inches;a first substantially hollow portion disposed between the top plate and the bottom plate and between the central elastomeric member and the first outer elastomeric member;a second substantially hollow portion disposed between the top plate and the bottom plate and between the central elastomeric member and the second outer elastomeric member;a first lateral adapter grip disposed between an inside surface of the first vertical shoulder of the engaged roller bearing adapter and the first upturned region of the bottom plate;a second lateral adapter grip disposed between an inside surface of the second vertical shoulder of the engaged roller bearing adapter and the second upturned region of the bottom plate;a first lateral side frame grip disposed on an outer surface of the first upturned region of the top plate;a second lateral side frame grip disposed between an outer surface of the second upturned region of the top plate; wherein 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 roller bearing adapter. |
