A bearing cage assembly is disclosed. The assembly includes a stiffening ring formed from a first material, and a cage formed from a second material that is different than the first material. The cage includes a plurality of arms extending axially away from a base rim. The plurality of arms define a plurality of rolling element pockets therebetween. Each of the plurality of arms defines a slot dimensioned to receive a portion of the stiffening ring, such that the stiffening ring is secured to the cage via engagement within the slots of the plurality of arms.

It is an object of the present invention to provide a thrust ball bearing which has a large load capacity, can realize thinned wall, and can further withstand a radial load. A pair of raceways (21, 22) include double rows of raceway grooves (23A, 23B) provided along a radial direction on surfaces facing each other. The retainer (40) includes claw-shaped protrusions (42) that protrude from peripheral edges of openings of pockets (41) in a convex manner and are arranged to face each other only in a circumferential direction of the retainer. A maximum width W of the claw-shaped protrusions (42) in the radial direction is smaller than a maximum width L of the raceway grooves (23) in the radial direction.

A cutting bur assembly including a cutting head with a head shaft extending therefrom. The cutting head and the head shaft are rotatable by a motor. A tube with the head shaft is rotatably mounted therein. The head shaft extends out from within the tube to locate the cutting head beyond a distal end of the tube. A plurality of bearing rollers are in direct cooperation with an outer surface of the head shaft such that upon rotation of the head shaft the plurality of bearing rollers roll along the outer surface. An outer bearing race surrounds the plurality of bearing rollers and the head shaft to retain the plurality of bearing rollers in cooperation with the head shaft.

A ball bearing includes an inner ring; an outer ring placed outside of the inner ring; a plurality of rolling bodies intervening between the inner ring and the outer ring; and an annular cage including pockets rotatably holding the rolling bodies in a circumferential direction at intervals determining a rotation axis to be a center. The cage comprises a resin composition comprising a polyetherketone-based resin, graphite, and a carbon fiber. The resin composition comprises the polyetherketone-based resin in an amount of 60% by weight or more and 80% by weight or less, the graphite in an amount of 10% by weight or more and 30% by weight or less, and the carbon fiber in an amount of 5% by weight or more and 20% by weight or less when the entire resin composition is determined to be 100% by weight.

An elongate rail (2) for use in a sliding support assembly (1), the sliding support assembly comprising a slide member (3) slidable in a longitudinal direction relative to the elongate rail and first (4a) and second locating assemblies, the elongate rail comprising a channel section defined by a first web, a first flange, and a second flange; a first wall (7a); and a second wall; wherein the first flange and the first wall (7a) define a first channel for retaining the first locating assembly (4a) and the second flange and the second wall define a second channel for retaining the second locating assembly.

A rolling bearing is disclosed which comprises an outer ring and an inner ring, wherein rolling elements are arranged between the outer ring and the inner ring, and wherein the rolling elements are spaced apart by a cage being arranged between the outer ring and the inner ring, wherein the cage is made of polymer containing reinforcing fibers, and the outer ring and/or the inner ring are steel rings with fine carbide precipitation.

A cutting bur assembly including a cutting head with a head shaft extending therefrom. The cutting head and the head shaft are rotatable by a motor. A tube with the head shaft is rotatably mounted therein. The head shaft extends out from within the tube to locate the cutting head beyond a distal end of the tube. A plurality of bearing rollers are in direct cooperation with an outer surface of the head shaft such that upon rotation of the head shaft the plurality of bearing rollers roll along the outer surface. An outer bearing race surrounds the plurality of bearing rollers and the head shaft to retain the plurality of bearing rollers in cooperation with the head shaft.

Provided is a method of manufacturing a resin retainer having two annular sections. A fixed-side cavity forming mold has a first axial mold surface that is in contact with an axial end surface of a first annular section of the annular sections of a resin retainer having two annular sections, and a first protruding portion protruding from the first axial mold surface. A movable-side cavity forming mold has a second axial mold surface that is in contact with an axial end surface of a second annular section of the annular sections of the resin retainer, and a second protruding portion protruding from the second axial mold surface. A slide core sliding step is performed in which slide cores are slid toward an outer diameter and pocket-forming protruding portions of the slide cores are extracted from a pocket of the retainer, and then a mold opening step is performed in which the movable-side cavity forming mold is opened relative to the fixed-side cavity forming mold.

A bearing unit provided with a radially outer ring, a radially inner ring, a plurality of rolling bodies interposed between the radially outer ring and the radially inner ring, and a retention device for keeping in position the plurality of rolling bodies, having a circular base rib, a plurality of fingers circumferentially spaced and defining a plurality of cavities for holding respective rolling bodies of the plurality of rolling bodies which are in contact with the retention device by means of a contact surface, and a plurality of discontinuity elements which reduce the extent of the area of contact with the rolling bodies.

A ball bearing is provided which includes a cage made of a resin, and having pockets open to the side surface of the cage on its one axial side. The ball bearing includes an outer bearing ring including a radially protruding engagement portion on the other axial side of the raceway surface. The cage includes engagement portions disposed on the other axial side of the pockets so as to be engageable with the engagement portion of the outer bearing ring in the other axial direction. The relationship between the axial depth H of each pocket and the diameter d of the ball is set at 0.15d≤H≤0.65d. By setting the above relationship in this way, it is possible to reduce the deformation of the cage due to a centrifugal force, and to reduce the shear resistance of lubricating oil between the pockets and the balls.