A wheel bearing unit includes an outer ring, a first inner ring with a first axial end face, first rolling elements arranged between the outer ring and the first inner ring, a second inner ring with a second axial end face, facing the first axial end face, second rolling elements arranged between the outer ring and the second inner ring, and a sealing device for sealing an interface of the first inner ring and the second inner ring. The sealing device includes an annular retaining element and a sealing element provided on the annular retaining element. The sealing element is a sealing ring that includes first and second contact points contacting the annular retaining element, a third contact point contacting the first inner ring, and a fourth contact point contacting the second inner ring. At least one of the contact points has a flat face.

A wheel bearing unit includes an outer ring, a first inner ring with a first axial end face, first rolling elements arranged between the outer ring and the first inner ring, a second inner ring with a second axial end face, facing the first axial end face, second rolling elements arranged between the outer ring and the second inner ring, and a sealing device for sealing an interface of the first inner ring and the second inner ring. The sealing device includes an annular retaining element and a sealing element provided on the annular retaining element. The sealing element is a sealing ring that includes first and second contact points contacting the annular retaining element, a third contact point contacting the first inner ring, and a fourth contact point contacting the second inner ring. At least one of the contact points has a flat face.

A seal assembly for a bearing includes an inner seal member that has an annular ring with a first lobe extending therefrom and a seal receiving surface on a leg extending axially from the annular ring. The seal receiving surface has two seating areas. The seal assembly includes an outer seal member positioned radially inward from the leg and axially outward from the annular ring. The outer seal member has a pivot member which has a second lobe extending outwardly therefrom. The seal assembly includes a retaining ring that has a circumferential groove formed therein. The pivot member is pivotally seated in the groove so that the second lobe is moveable between the two first seating areas.

A track roller assembly includes a split inner ring, a split outer ring, a one piece inner ring and/or a one piece outer ring and a liner or plurality of rolling elements engaging therewith, the track roller assembly being disposed in a structure of an Airbus A-350 aircraft, an Airbus A-320 aircraft, an Airbus A320Neo aircraft, an Airbus A330 aircraft, an Airbus A330Neo aircraft, an Airbus A321 aircraft, an Airbus A340 aircraft, and an Airbus A380 aircraft.

A track roller assembly includes a split inner ring, a split outer ring, a one piece inner ring and/or a one piece outer ring and a liner or plurality of rolling elements engaging therewith, the track roller assembly being disposed in a structure of an Airbus A-350 aircraft, an Airbus A-320 aircraft, an Airbus A320Neo aircraft, an Airbus A330 aircraft, an Airbus A330Neo aircraft, an Airbus A321 aircraft, an Airbus A340 aircraft, and an Airbus A380 aircraft.

A device for producing a releasable clearance-free position of a rolling bearing, having a rolling bearing which has an outer ring, an inner ring mounted on a shaft and a plurality of rolling elements arranged between the inner ring and the outer ring, and having a tensioning device mounted on the circumference of the rolling bearing outer ring for generating a radial preload which is uniform over the outer circumference of the rolling bearing outer ring between the tensioning device and the rolling bearing outer ring, wherein the tensioning device has an axially adjustable tensioning element which can be brought into a first alignment in which the rolling bearing has play, and which can be brought into a second alignment in which the rolling bearing is free of play. A corresponding method is also described.

A retainer-equipped double-row needle-roller bearing includes a pair of annular end flange portions; a center annular center flange portion; and two rows of pillars connecting the portions to each other to provide pockets between mutually adjacent pairs of pillars in a circumferential direction for holding rollers in two rows. The center flange portion has an outer diameter (D2), and the end flange portions have an outer diameter (D1), in a relationship expressed as D2<D1. When the retainer moves radially by an amount of gap associated with the rollers, the retainer is guided on the outer diameter surfaces of the end flange portions at two ends of the retainer, by the inner diameter surface of a housing. This stabilizes behavior of the retainer during rotation, reducing premature wear and abnormal noise.

A retainer-equipped double-row needle-roller bearing includes a pair of annular end flange portions; a center annular center flange portion; and two rows of pillars connecting the portions to each other to provide pockets between mutually adjacent pairs of pillars in a circumferential direction for holding rollers in two rows. The center flange portion has an outer diameter (D2), and the end flange portions have an outer diameter (D1), in a relationship expressed as D2<D1. When the retainer moves radially by an amount of gap associated with the rollers, the retainer is guided on the outer diameter surfaces of the end flange portions at two ends of the retainer, by the inner diameter surface of a housing. This stabilizes behavior of the retainer during rotation, reducing premature wear and abnormal noise.

A planetary gear mechanism comprises a sun gear, a planetary gear that meshes with the sun gear, a planetary carrier having a planetary shaft which axially supports the planetary gear, and a ring gear which meshes with the planetary gear; wherein: the planetary gear has a coaxially disposed first inside-diameter part and second inside-diameter part of different inside diameter; the planetary gear mechanism has a first bearing member that has an outside diameter conforming to the first inside-diameter part and a second bearing member that has an outside diameter conforming to the second inside-diameter part, the two bearing members being arranged between the planetary shaft and the planetary gear; and the planetary gear mechanism is easily assembled while having a configuration in which the two bearing members are interposed between the planetary shaft and the planetary carrier so as to be coaxially divided in the axial direction.

A universal joint having a retainer ring that secures a bearing cup to a cross shaft. A bearing cup retainer may secure the bearing cup to the retainer ring. A cross shaft retainer may secure the retainer ring to the cross shaft. A seal may extend from the body of the retainer ring to the cross shaft.