A ball bearing includes an inner ring with an inner raceway groove formed on an outer periphery of the inner ring, an outer ring with an outer raceway groove formed on an inner periphery of the outer ring, a plurality of balls interposed between the inner raceway groove and the outer raceway groove, and an annular cage that holds the balls at predetermined intervals along a circumferential direction. The cage has an annular portion positioned on an axially first side of the balls and a plurality of cage bars extending from the annular portion toward an axially second side. Each of the cage bars has a guide portion that positions the cage by contacting an area of the inner raceway groove that is different from an area contacted by the balls and pocket surfaces each come into point contact with a corresponding one of the balls.

A cage for a roller bearing is provided. The cage has a ring-shaped base body with a plurality of pockets for receiving rolling elements. The base body is formed by two side rings arranged in a defined axial distance and by a plurality of pocket elements, which are located between the side rings. Each pocket element has two face sides designed for contacting a rolling element. The connection between the pocket element and each of the side rings is established by at least one beam joined with one of the side rings and the pocket element. The beam is a positive substance joined with one of the side rings and the pocket element and has a ring-shaped or elliptical cross section in a section perpendicular to the longitudinal extension of the beam.

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 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 rolling bearing device includes: a bearing part having an inner ring, an outer ring, and balls; and an oil supply unit provided adjacent to an annular space between the inner ring and the outer ring and capable of supplying lubricating oil to the annular space. The bearing part has an annular cage provided in the annular space. The cage has a pair of annular parts and a plurality of bars. An outer circumferential surface of the annular part located on a first axial side has a contact portion capable of coming in contact with a part of an inner circumferential surface of the outer ring. A radially outer surface of the cage has, with the contact portion being a top, a first inclined surface provided from the top toward the first axial side and a second inclined surface provided from the top toward a second axial side.

A ball bearing includes an inner ring with an inner raceway groove formed on an outer periphery of the inner ring, an outer ring with an outer raceway groove formed on an inner periphery of the outer ring, a plurality of balls interposed between the inner raceway groove and the outer raceway groove, and an annular cage that holds the balls at predetermined intervals along a circumferential direction. The cage has an annular portion positioned on an axially first side of the balls and a plurality of cage bars extending from the annular portion toward an axially second side. Each of the cage bars has a guide portion that positions the cage by contacting an area of the inner raceway groove that is different from an area contacted by the balls and pocket surfaces each come into point contact with a corresponding one of the balls.

A rolling bearing device includes: a bearing part having an inner ring, an outer ring, and balls; and an oil supply unit provided adjacent to an annular space between the inner ring and the outer ring and capable of supplying lubricating oil to the annular space. The bearing part has an annular cage provided in the annular space. The cage has a pair of annular parts and a plurality of bars. An outer circumferential surface of the annular part located on a first axial side has a contact portion capable of coming in contact with a part of an inner circumferential surface of the outer ring. A radially outer surface of the cage has, with the contact portion being a top, a first inclined surface provided from the top toward the first axial side and a second inclined surface provided from the top toward a second axial side.

An angular ball bearing for a turbocharger, including an outer ring and a cage, along the circumference of which rolling element pockets are arranged and at the end face of which a cage guide surface runs, the cage guide surface together with a surface on the inner circumference of the outer ring forming a sliding surface pair. The sliding surface pair forms a transition region at the sliding surface pair end facing the rolling element pockets such thatwhen the cage and the outer ring are positioned in an axially parallel manner, the spacing between the surfaces which form the sliding surface pair increases in a monotonous manner, said increase growing continuously. The progression of the spacing achieves a reduction of the wear susceptibility.

A ball bearing retainer holds balls disposed between an inner ring and an outer ring, in pockets formed at a plurality of portions, in a circumferential direction, of an annular body. The annular body includes: annular parts disposed on both sides in an axial direction; and pillar parts that are disposed at a plurality of portions in the circumferential direction and that connect between the annular parts. The pockets are formed by the annular parts and the pillar parts adjacent to each other in the circumferential direction, and allow ball guide. First contact portions of the pillar portions, which contact portions contact with the balls in the circumferential direction, are formed by first planes that extend along the axial direction, and the balls are guided by the first planes.

A cage for a roller bearing is provided. The cage has a ring-shaped base body with a plurality of pockets for receiving rolling elements. The base body is formed by two side rings arranged in a defined axial distance and by a plurality of pocket elements, which are located between the side rings. Each pocket element has two face sides designed for contacting a rolling element. The connection between the pocket element and each of the side rings is established by at least one beam joined with one of the side rings and the pocket element. The beam is a positive substance joined with one of the side rings and the pocket element and has a ring-shaped or elliptical cross section in a section perpendicular to the longitudinal extension of the beam.