The invention relates to a rolling bearing, in particular in the form of an open-center large rolling bearing, comprising a large number of rolling elements, which are held between at least two raceways, on which the rolling elements roll, wherein spacers are provided between the rolling elements, which spacers keep the rolling elements spaced apart from each other. According to the invention, at least one of the raceways has, in a center portion, an approximately groove-shaped longitudinal recess, in which support arms provided between the spacers run, which support arms reach around the rolling element between two adjacent spacers and support the adjacent spacers against each other in the running direction of the rolling elements.

A solid lubricant 11 is formed by molding and firing powder that includes amorphous and self-sintering carbon material powder 12, graphite powder 13, and a binder 14. The solid lubricant has high material strength and hardness, and also excellent impact resistance and wear resistance.

The invention is directed to a rolling bearing having at least one row of cylindrical rolling bodies for transmitting axial forces between two annular connection elements which are concentric to a common axis of rotation and which, for the purpose of rotation about the common axis of rotation, are spaced apart from one another by a gap, wherein the at least one row of cylindrical rolling bodies is so arranged that, in the unloaded state of the rolling bearing, the axes of rotation of all the cylindrical rolling bodies of the row lie in a common plane through which the common axis of rotation passes perpendicularly, wherein at least one raceway for the at least one row of cylindrical rolling bodies is in the form of a flat surface of a wire which has on its surface region complementary to the raceway surface an arcuate, convexly curved cross-sectional profile and is thereby inserted at least in some regions into a peripheral recess having a cross-sectional profile complementary thereto in an annular connection element.

An anti-friction radial bearing has an inner track, an outer track, a pair of extension members, load-carrying rolling members, and double coaxial, cylindrical individual spacers. Each of the extension members has an internal cylindrical hoop surface and is securely mounted to at least one of the inner and outer tracks. The rolling members are equidistantly spaced and rotatably engageable with the inner and outer tracks. The spacers are disposed in pure rolling contact at their ends with the internal cylindrical hoop surfaces of the extension members. Each of the spacers is positioned in pure rolling contact between a corresponding adjacent pair of the rolling members.

A screw device is provided which can facilitate management of a tolerance of a recess where a circulation component is housed. A circulation component is housed in a recess of a nut with clearance. At least part of the circulation component is blocked by a lid member fixed to the nut by fastening means. Upon a centrifugal force acting on a rolling element moving along a circulation path in the circulation component, the circulation component comes into contact at three points with the recess as viewed in an axial direction.

An anti-friction bearing includes a pair of rotatable tracks, a pair of extension members removably securely mounted to one of the pair of tracks, spaced load-carrying rolling members rotatably engageable between the two tracks, and individual spacers disposed to roll on the surfaces of the pair of extensions members. Each of the individual spacers is engageable with and cooperatively separates an adjacent pair of the rolling elements. All of the components of the bearing are disposed in corresponding pure rolling contact, i.e., without sliding, relative one another.

The invention is directed to a rolling bearing having at least one row of cylindrical rolling bodies for transmitting axial forces between two annular connection elements which are concentric to a common axis of rotation and which, for the purpose of rotation about the common axis of rotation, are spaced apart from one another by a gap, wherein the at least one row of cylindrical rolling bodies is so arranged that, in the unloaded state of the rolling bearing, the axes of rotation of all the cylindrical rolling bodies of the row lie in a common plane through which the common axis of rotation passes perpendicularly, wherein at least one raceway for the at least one row of cylindrical rolling bodies is in the form of a flat surface of a wire which has on its surface region complementary to the raceway surface an arcuate, convexly curved cross-sectional profile and is thereby inserted at least in some regions into a peripheral recess having a cross-sectional profile complementary thereto in an annular connection element.

In a bearing device 1, a plurality of columnar needle rollers 13 are provided. A cage 14 is provided in which the needle rollers 13 are arranged in parallel with each other along an axial direction R of a pin roller 9, so that the needle rollers 13 form a cylindrical configuration around the pin roller 9. The cage 14 has oppositely placed two rings 17 and a plurality of bridge pieces 18 bridged between the two rings 17, and having the bridge pieces 18 to rotatably accommodate the needle rollers 13 in order to achieve higher performances.

A spacer device for roller elements of a toroidal roller bearing includes an inner ring and an outer ring. The toroidal roller bearing allows for axial and angular displacement between the inner and outer rings. The spacer device comprises a first roller element-contacting surface and a second roller element-contacting surface on opposite sides thereof. First and second roller-contacting surfaces are arranged to separate two adjacent roller elements in a tangential direction of the toroidal roller bearing when the spacer device is in use. Each of the first and second roller element-contacting surfaces has a concave shape adapted to conform to respective convex contacting surfaces of the roller elements. The spacer device comprises end members that have projections that extend outwards from first and second roller-contacting surfaces and which are arranged to extend at least partly over the ends of two adjacent roller elements when the spacer device is in use.

This relates to an electrical rotary joint device configured to equip an energy exploitation installation including a first part having an electrical connector and a first electrical track electrically connected to the first connector, a second part having a second electrical connector and a second electrical track electrically connected to the second connector, and an electrical interconnection mechanism configured to electrically interconnect the first and second electrical tracks, with the first part and the second part being movable with respect to each other and defining between them a closed internal chamber in which the first and second electrical tracks and the electrical interconnection mechanism are housed, the latter including electrical contact members that are housed, in particular prestressed, between the first and second electrical tracks and are configured to form rolling deformable contacts between the first and second electrical tracks.