Bearing unit provided with at least one ring of rolling bodies and, for retaining the rolling bodies, at least one retaining cage which has a cage bar, a plurality of circumferentially spaced cage arms that extend from one side of the cage bar, and a plurality of partially spherical cavities for retaining the rolling bodies; contact points between the rolling bodies and the cage being positioned in the vicinity of a polar region of each rolling body. The minimum number of contact surfaces for containing the rolling bodies in the direction of rotation of the bearing and ensuring contact only in the polar region is equal to two for each rolling body, namely one upper contact surface and one lower contact surface.

A one-way snap-in bearing cage providing a substantially annular backbone, and a hanging-out portion extending from the backbone to one axial side, the hanging-out portion having pockets, which are distributed at intervals in a circumferential direction and used to accommodate spherical rollers, and pocket connections for connecting adjacent pockets. The pocket, at least in the vicinity of a radial inner edge at an opening side of the pocket, employs an expanding design achieving remoteness from a surface of the roller.

A one-way snap-in cage for a deep groove ball bearing having an annular backbone portion and a hanging out portion extending from the backbone portion towards an axial side. The hanging out portion including a pocket for accommodating a rolling element of a bearing in a circumferential direction and a pocket connection used to connect adjacent pockets. A bottom portion of the pocket is formed integrally with the backbone portion. The ratio H.sub.c/D.sub.w of a radial size H.sub.c of the cage in terms of thickness to the diameter D.sub.w of the rolling element of the bearing satisfies the relation 17.679%H.sub.c/D.sub.w37.389%, the radial size H.sub.c of the cage is equal in value to half of the difference between the maximum outer diameter D.sub.c_max and the minimum inner diameter D.sub.c_min of the cage. The present invention further provides a deep groove ball bearing using the cage.

A turbocharger having a rotatable shaft, a stationary housing, a turbine wheel mounted on one end of shaft, a compressor wheel mounted onto an opposite end of shaft, and at least one rolling bearing disposed between the shaft and the housing. The rolling bearing includes a stationary outer ring fixed to the housing, a rotatable inner ring fixed to the shaft, at least one row of balls disposed in a rolling chamber defined between the outer ring and inner ring, and an annular non-deformable cage providing circumferentially a plurality of through holes forming pockets where the balls are housed. The pockets being axially delimited between annular cage heels. Each pocket of cage is extended by a slot through one of cage heels, the cage heel provided with the slots being axially oriented towards the interior side of turbocharger.

Provided are a bearing and a medical device in which a gap is secured between an inner ring and an outer ring, and the gap can be used as a flow path for a fluid or an object. A bearing having a plurality of rolling elements between an inner ring and an outer ring is provided with a raceway surface on which the rolling elements roll on the outer ring and receiving portions for rotatably accommodating the rolling elements at a position of the inner ring facing the raceway surface.

A cage for a ball bearing having a meandering wire which, extending around an axis of rotation (X) of the bearing of the ball type, defines a plurality of seats for receiving respective balls of the ball-type bearing. Further, the cage being also provided with a separating element between each pair of adjacent seats and, for each seat, with three points (P) of contact between balls and meandering wire for retaining the balls inside the associated seat. The separating element being formed by the same meandering wire and the points (P) of contact lying on the same meandering wire.

A bearing unit having at least one row of rolling bodies; and at least one cage for retaining a respective one of the at least one row of rolling bodies. The at least one cage comprising at least one base bar, a plurality of arms circumferentially spaced apart and extending from one side of the base bar, and a plurality of partially spherical cavities for retaining the respective one of the at least one row of rolling bodies. The respective row of rolling bodies and the at least one cage are in contact with each other along contact points positioned near a polar region of the respective one of the at least one row of rolling bodies, so that an angular distance () of the contact points with respect to an equator of the respective one of the at least one row of rolling bodies is between 40 and 75.

A bearing retainer for use in a bearing is provided. The bearing includes an inner ring, rolling elements and an outer ring. The bearing retainer includes a body. The body defines an inner periphery and an outer periphery of the body. The body further defines a plurality of inner walls. Each inner wall defines an opening extending from the inner periphery to the outer periphery of the body. The plurality of openings is adapted to receive one of the rolling elements. The inner walls are adapted to keep the rolling elements in a spaced apart relationship. Ribs extend inwardly from the inner periphery of the body.

A retainer for a bearing is entirely formed into an annular shape and has a crown shape. The retainer includes pockets which are formed at a plurality of locations in a circumferential direction of the retainer and are each opened on a radially outer side and a radially inner side. The pockets retain balls being rolling elements so that the balls are rollable. A grease flow-in passage is provided between an inner surface of each of the plurality of pockets and each of the balls.

A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and a cage in which a plurality of pockets that accommodate the balls are formed along the circumferential direction. The cage is a snap cage that has an annular body provided on one side in an axial direction, and a plurality of prongs provided so as to extend from the annular body toward the other side in the axial direction. Spaces on the other side of the annular body in the axial direction and between the prongs which are adjacent to each other in the circumferential direction serve as the pockets. A pocket surface of the pocket that faces the ball is a part of a spherical surface. The cage can contact the inner peripheral side of the outer ring for positioning in the radial direction.