Cylindrical roller bearing

摘要

A guide piece projects from an outside surface of a cage bar of a cage so as to make sliding contact with a raceway surface of an outer ring. As the cage rotates, the guide piece operates to guide the rotation of the cage while removing an excess grease on the raceway surface and transferring the excess grease to axially opposite ends of the outer ring. The guide piece is formed with a through-hole extending from an inner periphery of the cage to an edge of the guide piece for supplying the lubricant from the inner periphery side of the cage to the raceway surface.

主权项

1. A cylindrical roller bearing comprising:
an inner ring including a raceway surface on an outer periphery thereof: an outer ring including a raceway surface on an inner periphery thereof; a plurality of cylindrical rollers rollably disposed between the raceway surface of the inner ring and the raceway surface of the outer ring; and a cage for circumferentially retaining the cylindrical rollers at predetermined intervals, wherein the cage is circumferentially provided with a plurality of guide pieces on an outer periphery of the cage at predetermined intervals, a guide piece of the plurality of guide pieces projecting toward the raceway surface of the outer ring to form a sliding contact portion which makes sliding contact with the raceway surface for guiding the rotation of the cage and for removing an excess lubricant on the raceway surface, and wherein at least one guide piece of the plurality of guide pieces comprises a through-hole extending from an inner periphery of the cage to an edge of the guide piece for supplying the lubricant from the inner periphery side of the cage to the raceway surface, and wherein at least one guide piece of the plurality of guide pieces comprises a pair of tapered faces formed at axially opposite ends of the guide piece, the pair of tapered faces are inclined from the outer periphery of the cage substantially toward an axial center of the sliding contact portion of the guide piece for sliding contact with the raceway surface of the outer ring, wherein an axial full length of a base portion of the pair of the tapered faces is substantially equal to an axial full length of the raceway surface of the outer ring, and wherein a portion of the guide piece that makes sliding contact with the raceway surface has a shorter axial full length than an axial full length of the raceway surface.