A radial bearing comprises a traditional bearing having a plurality of sinusoidal shaped wheels in place of traditional spheroid bearings. The race of bearing may also comprise a sinusoidal shape.

A bearing assembly includes a roller bearing unit, an inner race and an outer race. The roller bearing unit is formed of polycrystalline super-hard material having a mean mass density of at most 4.5 g/cm.sup.3 and a volume-weighted arithmetic mean thermal conductivity of at least 100 W/m.Math.K.

A bearing assembly includes a roller bearing unit, an inner race and an outer race. The roller bearing unit is formed of polycrystalline super-hard material having a mean mass density of at most 4.5 g/cm.sup.3 and a volume-weighted arithmetic mean thermal conductivity of at least 100 W/m.Math.K.

A bearing includes a plurality of rolling elements (26) spaced around a three-hundred and sixty degree circumferential extent of the bearing. An odd, non-singular number of high-points are positioned as near to evenly as possible about the circumferential extent of the bearing, the high-points defined by locations at which rolling elements with the largest diameters are positioned. An odd, non-singular number of low-points are positioned as near to evenly as possible about the circumferential extent of the bearing, the low-points defined by locations at which rolling elements having the smallest diameters are positioned. The odd, non-singular number of high-points is the same as the odd, non-singular number of low-points, and each low-point is positioned as near to evenly as possible between two adjacent high-points.

A roller bearing ring having at least one raceway. The raceway provides a first and a second axial end and a diameter of the first axial end and a diameter of the second axial end are either both greater than the mean diameter of the raceway or both less than the mean diameter of the raceway. The roller bearing ring includes a projection, which is on the same side of the bearing ring as the raceway and which limits the raceway without being a part of the raceway.

A roller bearing ring having at least one raceway. The raceway provides a first and a second axial end and a diameter of the first axial end and a diameter of the second axial end are either both greater than the mean diameter of the raceway or both less than the mean diameter of the raceway. The roller bearing ring includes a projection, which is on the same side of the bearing ring as the raceway and which limits the raceway without being a part of the raceway.

In a tapered roller bearing (10), the surface roughness of at least a rolling surface (13c) and a large diameter-side end surface (13b) of a tapered roller (13) is 0.02 to 0.17 μm in reduced peak height Rpk, 0.12 to 0.21 μm in core roughness depth Rk, and 0.07 to 0.43 μm in reduced valley depth Rvk and the average recessed portion area in the fine irregularities on the surface of the tapered roller (13) is 5 μm.sup.2 or less. As a result, oil film formability can be improved under dilute lubrication and a decline in lubricating oil viscosity and surface damage at a rolling contact part and an increase in friction at a sliding contact part can be suppressed at the same time.

A roller is provided that is configured to support of a rotary platform. The roller includes at least one side flange including an inner surface, a rolling surface to be in contact with a flat running surface of an upper rail member fixedly connected to the rotary platform and a flat running surface of a lower rail member stationary arranged. The roller includes a circumferential recess connecting the rolling surface to the inner surface of the side flange and that the circumferential recess has a depth such that the flat running surfaces of the upper rail member and the lower rail members are out of contact with a bottom surface of the circumferential recess at a potential angle deviation between the flat running surfaces of the rail members and a rotation axis of the roller.

A roller is provided that is configured to support of a rotary platform. The roller includes at least one side flange including an inner surface, a rolling surface to be in contact with a flat running surface of an upper rail member fixedly connected to the rotary platform and a flat running surface of a lower rail member stationary arranged. The roller includes a circumferential recess connecting the rolling surface to the inner surface of the side flange and that the circumferential recess has a depth such that the flat running surfaces of the upper rail member and the lower rail members are out of contact with a bottom surface of the circumferential recess at a potential angle deviation between the flat running surfaces of the rail members and a rotation axis of the roller.

A transport-securing unit for retaining a plurality of rollers in a rolling-element bearing cage during transportation may include an annular region and a plurality of axially extending, circumferentially spaced projections extending from the annular region. Also, an assembly of the transport-securing unit, a rolling-element cage and a plurality of rollers in pockets of the rolling-element bearing cage, where the transport-securing unit is formed separately from the rolling-element bearing cage, and where the projections extend inside the cage and limit radially inward movement of the rollers relative to the cage.