A rolling bearing (1) for an exhaust gas turbocharger, including an outer race (2) and an inner race (3), between which there roll rolling bodies (4) guided by a cage (7). The cage (7) is then guided with a cage guiding surface (9) on a raceway (10) of the outer race (2) and is equipped with openings (11) which connect the cage guiding surface (9) with that side of the cage (7) oriented toward the inner race (3), in order to guide lubricant thrown off through the inner race (3) between the cage guiding surface (9) and the raceway (10). In order to now improve a lubricant supply to the cage guide, the cage (7) is provided, on the side oriented toward the inner race (3), with at least one groove (12) into which each of the openings (11) opens.

A cage includes: an annular body having pocket holes for receiving balls; and a resin portion formed through injection molding of a resin containing a solid lubricant with the body being set as an insert component. The resin portion includes: first parts formed along inner peripheral surfaces of the pocket holes of the body to form pocket surfaces to be held in sliding contact respectively with the balls; and a second part formed along an outer peripheral surface (or inner peripheral surface) of the body to form a guide surface to be held in sliding contact with an outer ring (or inner ring). The first parts and the second part are formed integrally with each other. Weld lines of the resin portion are formed at positions of avoiding exposure of the weld lines at both end portions of the pocket surfaces in a cage circumferential direction.

A bearing arrangement comprises a rolling element bearing assembly including a bearing cage. The bearing cage comprises an annular cage body having an inner surface defining a coaxial bore. The bearing cage has a plurality of circumferentially spaced pockets and each pocket houses a rotatable rolling element. A first annular skirt extends axially from a radially inner end of a first axial end of the cage body and at least one first support member extends radially and axially from the remote axial end of the first annular skirt to the radially outer end of annular cage body. The bearing cage is hollow and has a high stiffness to weight ratio. The bearing arrangement is particularly suitable for use for a planet gear of a planetary gearbox. The planetary gearbox may be for a gas turbine engine.

A cage for a rolling bearing assembly with optimized contact surfaces to reduce friction between the cage and the adjacent contact surfaces is disclosed. The rolling bearing assembly includes a radially inner bearing ring including a radially inner race defined on a radially inner rolling element facing surface, a radially outer bearing ring including a radially outer race defined on a radially outer rolling element facing surface, and a plurality of rolling elements supported to roll between the radially inner race and the radially outer race. The cage includes a first rim including a first rolling element guide surface facing a plurality of rolling elements. A first outer surface facing away from the first rolling element guide surface includes a first outward projection. In another embodiment two bearing assemblies are provided, and each of the bearing assemblies includes a cage with optimized contact surfaces.

In a copper alloy machined cage for a thrust ball bearing, an inside surface of a pocket includes a cylindrical surface, a support surface which is continuous with the cylindrical surface and contacts a ball in an axial direction, and two protruding portions which are formed at an equal interval in a circumferential direction of the pocket, at a ball insertion side of the pocket which is opposite to the support surface in the axial direction and protrude from the cylindrical surface. The protruding portions prevent falling out of the ball from a ball insertion side opening of the pocket and are either elastically deformed or elastic-plastically deformed by the ball during insertion of the ball into the pocket.

The invention provides a cage for a bearing. The invention further provides the bearing and a method of producing the cage. The cage includes a plurality of pockets at least partially surrounding the rolling elements. The cage further comprises a first material and a second material. The first material is a first printed material printed via an additive manufacturing process that has different properties compared to the second material. The first material is printed in the pockets at a position where, the rolling elements at least occasionally contact the pockets. Using such first printed material allows application of the first printed material at a location where it is needed.

A ball bearing includes an inner ring, an outer ring, a plurality of balls rollably disposed between an inner ring raceway surface of the inner ring and the outer ring raceway surface of the outer ring, and a cage in which pockets rollably holding the balls are formed at intervals in a circumferential direction. An inclination angle of a cylindrical surface of each of the pockets is set more than 0 and less than a contact angle of the ball bearing, the cylindrical surface and a corresponding ball are in contact with each other at an inner side in a cage thickness direction relative to a position where a rotation axis of the ball intersects with the cylindrical surface, and a space is formed at a portion from a contact position to a circumferential surface of the cage on a side closer to the intersection position.