Patent ID: 8807842

Claim:
A generally cylindrical thrust bearing assembly comprising: an external envelope machined as non-separable cylindrical part, said envelope having first and second close rims that are configured to contain seals, washers and rollers within the thrust bearing assembly and thereby to keep all parts of the thrust bearing assembly as a unitary piece when in use, a portion of the envelope being further configured to guide a roller cage assembly within the thrust bearing assembly; a first rubber seal extending around the assembly proximate the first close rim, the first rubber seal having a first plurality of lips formed proximate the circumference of the assembly at an angle acute to the circumference of the assembly; a second rubber seal extending around the assembly proximate the second close rim, the second rubber seal having a second plurality of lips formed proximate the circumference of the assembly at an angle acute to the circumference of the assembly, the second plurality of lips thereby forming a barrier to entry of contaminates into the thrust bearing assembly; a top and bottom face that create a void to provide space for a circumferential folding rubber lip, the circumferential rubber lip having a plurality of circumferentially extending angular lips that are configured to create a unidirectional seal between the void and the second close rim, the unidirectional seal designed to permit leakage of lubrication from the void but block contamination from entering the void; and an external O-ring for creating a seal between a top washer and the envelope.