Patent ID: 7874736

Claim:
An oil-lubricated roller bearing assembly comprising: an inner ring, an outer ring and a roller rollably interposed between these inner and outer rings, at least one of the inner ring and outer ring being formed with a rib making contact with an end face of the roller for guiding the rolling motion of the roller, the roller formed with a recess centrally of the end face thereof, the roller bearing assembly wherein a stopper member for preventing oil invasion is fitted in the recess of the roller, wherein an inner periphery of the recess is defined by a tapered periphery progressively increased in diameter from an inner most side of the recess toward an opening edge of the recess, and wherein the stopper member has a top surface facing away from the roller and the recess, and the top surface of the stopper member within a width range of the opening edge of the recess is convex or concave.