An axial ball joint includes a ball stud including a stud portion and a ball portion; a metal housing configured to rotatably support the ball portion of the ball stud; a resin ball sheet provided in an interposed manner between the ball portion and the housing. The housing is formed in a bottomed cylindrical shape by press work. The housing has a bottom wall and a peripheral side wall which are set respectively to thicknesses substantially equal to each other. The bottom wall and the peripheral side wall of the housing have therebetween a boundary portion formed with multiple rib portions which project in a brace shape from outside to inside of the housing.

A wheel bearing assembly according to one embodiment of the present disclosure may comprise a wheel hub, at least one inner ring, an outer ring, and one or more rolling elements. According to one embodiment of the present disclosure, an accommodation space may be formed inward of a vehicle-body-side end portion of the wheel hub to accommodate a constant velocity joint, and a plurality of recesses for accommodating rotating elements of the constant velocity joint are formed on an inner peripheral surface of the accommodation space to be spaced apart from each other along a circumferential direction. According to one embodiment of the present disclosure, a first heat-treated hardened portion may be formed on the inner peripheral surface of the accommodation space, wherein the first heat-treated hardened portion may be formed to have portions with which the rotating elements of the constant velocity joint is brought into contact. According to one embodiment of the present disclosure, a second heat-treated hardened portion may formed on an outer peripheral surface of the wheel hub, wherein the first heat-treated hardened portion and the second heat-treated hardened portion may be formed so as not to overlap each other.

A manufacturing apparatus 1 has a leveler 3 which, while pulling out a steel plate starting with one end thereof and while transporting it, corrects the waviness and the like of the steel plate, which serves as a backing plate 2 and is constituted by a continuous strip having a thickness of 0.3 to 2.0 mm and provided as a hoop material by being wound into a coil shape.

A bearing member 1 is provided with a coating layer 3 on an inner circumferential surface of a shaft hole 1A into which a shaft body 2 is to be fitted. The coating layer 3 is composed of a metal base material 3A and a heat conductive material 3B that is dispersed in the base material 3A and that has a thermal conductivity relatively higher than that of the base material 3A. The heat conductive material 3B has lengths Lb and Lc in directions B and C along a surface of the coating layer 3, longer than a length La in a thickness direction A of the coating layer 3, whereby thermal conductive characteristics in the directions B and C along the inner circumferential surface of the shaft hole 1A are enhanced. Thus, heat dissipation is improved, whereby temperature rise due to sliding contact with the shaft body 2 is suppressed, and seizure resistance is improved.

A tapered roller bearing includes an inner ring having a tapered raceway surface and a large-collar surface on a large-diameter side of the raceway surface, and tapered rollers. Each of the rollers has a large end surface guided by the large-collar surface. When R represents a set curvature radius of the large end surface and R.sub.BASE represents a base curvature radius from a vertex of a cone angle of each of the tapered rollers to the large-collar surface, the base curvature radius R.sub.BASE is 100 mm or less, and a ratio R/R.sub.BASE of the set curvature radius R to the base curvature radius R.sub.BASE is set to 0.90 or less. When R.sub.ACTUAL represents an actual curvature radius of the large end surface of each of the tapered rollers, a ratio R.sub.ACTUAL/R of the actual curvature radius R.sub.ACTUAL to the set curvature radius R exceeds 0.5.

A bearing bush includes at least one sealing element and one bearing element. The sealing element is provided with at least one sealing lip. The bearing element is substantially tubular. The bearing element includes a plurality of protrusions extending in the axial direction on the outer circumference. The inner diameter of the bearing element is larger in the sections corresponding to the protrusions than in the remaining sections.

A bearing sleeve element comprising a thin sheet of metal like bronze or brass with “dog bone” shaped pattern cut out through metal sheet in combination with a thin sheet of Teflon compressed and trapped inside “dog bone” shaped cavities of metal sheet in order to serve as a low friction bearing between two sliding surfaces.

An asymmetric bearing ring to support a plug is disclosed. The bearing ring is an annular ring with an inner surface and an outer surface, wherein the inner surface and the outer surface are not parallel. The bearing ring can be part of a plug tubular system including a tubular body and a plug assembly, where the tubular body include a housing, and the plug assembly arranged in the housing include a plug, the asymmetric bearing ring, and a seat which supports the plug; and wherein the asymmetric bearing ring is arranged between the plug and the seat and/or the asymmetric bearing ring is arranged between the plug and the housing.

A tube for a power transmission shaft is made of fiber-reinforced plastic, rotated to transmit power, and includes a main body in a shape of cylinder about an axis, wherein the main body has an outer diameter thereof gradually decreasing from a central portion thereof toward both ends thereof, and has a thickness thereof gradually decreasing from said both ends toward the central portion.

A coated bearing component comprising a metallic part and a coating deposited on the metallic part. The coating is a multi-layer coating having a sensor active layer made of a material having electrostrictive properties. The sensor active layer is directly coated on the metallic part. The bearing component can be integrated into a bearing.