Patent ID: 7845587

Claim:
A pulverizer upper gearbox bearing assembly for a mill, comprising: a bowl hub having a stepped hub defining a first bore to receive a shaft therethrough and a bowl extending radially outwardly therefrom defining a cavity between the stepped hub and bowl, the stepped hub having a first outside diameter extending to a second outside diameter, which in turn extends to a third outside diameter along a longitudinal axis of the first bore, the first outside diameter larger than the second outside diameter, which is larger than the third outside diameter; a thrust bearing disposed around the first outside diameter, the thrust bearing having an upper washer and a lower washer, the upper washer having an interference fit with the first outside diameter of the bowl hub; a roller bearing disposed around the third outside diameter, the roller bearing having a separable inner ring from an outer ring and a surrounding cage and roller assembly; a mill base hub extending into the cavity between the bowl and stepped hub, the mill base hub defining a first inside diameter extending to a second inside diameter, which in turn extends to a third inside diameter along a longitudinal axis of the first bore, the first inside diameter larger than the third inside diameter, which is larger than the second inside diameter; and a fluorocarbon rubber oil seal disposed in an annulus of an edge defining the first inside diameter of the mill base hub, wherein the upper washer of the thrust bearing is disposed between the first outside diameter of the base hub and the oil seal and first inside diameter of the mill base hub, the second outside diameter of the bowl hub is inside and aligned with the second inside diameter of the mill base hub, the third outside diameter of the bowl hub has an interference fit with the inner ring of the roller bearing, and the third inside diameter of the mill base hub allows the outer ring, cage and roller assembly of the roller bearing to fit therein allowing removal of the bowl hub, inner ring, upper washer and shaft from the mill base hub.