ROLLER BEARING

摘要

Surface indentation and oil film shortage on rollers is prevented and longer service life of a roller bearing is achieved, by preventing wear debris from being caught and accumulated in pockets of a holder of the roller bearing. Positions and dimensional relations of the diameters of inner and outer ring raceways, the inner and outer diameters of the holder, and inner and outer protrusions which are provided to pillar parts of the holder to prevent the rollers from coming off are defined such that the inner and outer protrusions of the pillar parts always do not come into contact with the outer circumferential surfaces of the rollers in the state where the rollers and the holder are incorporated between inner and outer members. As a result, lubricant oil is smoothly circulated in gaps formed between the outer circumferential surfaces of the rollers and the pillar parts of the holder.

主权项

1. A roller bearing comprising:
an outer member having a cylindrical outer ring raceway on an inner circumferential surface thereof; an inner member having a cylindrical inner ring raceway on an outer circumferential surface thereof; a plurality of rollers that are rollably provided between the outer ring raceway and the inner ring raceway; and a holder that holds the rollers at predetermined intervals in a circumferential direction thereof, wherein an entirety of the holder is formed in a cylindrical shape, the holder has pockets that respectively house the rollers, at predetermined intervals in the circumferential direction, the holder includes: pillar parts between the pockets adjacent to each other in the circumferential direction; and annular parts on both sides in an axial direction of the pillar parts, inner protrusions and outer protrusions that prevent the rollers from coming off are respectively provided on an inner diameter side and an outer diameter side on both the sides in the axial direction of the pillar parts, and positions and dimensional relations of an outer ring raceway diameter, an inner ring raceway diameter, inner and outer diameters of the holder, and the inner protrusions and the outer protrusions of the pillar parts are defined such that a non-contact state is kept between: outer circumferential surfaces of the rollers; and the inner protrusions and the outer protrusions provided to the pillar parts in a state where the rollers and the holder are incorporated between the outer ring raceway diameter and the inner ring raceway diameter.