The present invention provides a bearing cage for a rotor bearing of a turbomolecular pump. The bearing cage comprises a plurality of bearing pockets each of which, in use, houses a bearing ball such that the bearing ball operably engages an inner race and an outer race of the rotor bearing. Each bearing pocket of the bearing cage has a primary chamber for housing the bearing ball and each bearing pocket further comprises a sump.

A roller and cage assembly includes: a cage (12) including a pair of rings (11) and a plurality of cage bars (21) extending in an axial direction and connecting the rings (11) to each other; and rollers disposed in pockets between the cage bars (21, 21) adjacent to each other in a circumferential direction. The cage bar (21) includes an end portion (22) and a middle portion located radially inward from the end portion (22). The end portion (22) has an outer retaining protrusion (25) formed therein, the outer retaining protrusion protruding into the pocket and configured to contact the roller to restrict radially outer movement of the roller. The end portion (22) of the cage bar (21) has an oil groove (31) in an inner peripheral surface (26) thereof, the oil groove extending in the circumferential direction and connecting to the outer retaining protrusion (25).

Some embodiments of the disclosure disclose a bearing assembly and a compressor with the bearing assembly. The bearing assembly includes: a retainer assembly (50), a bearing stationary ring (40), and a bearing rotary ring (10). The retainer assembly (50) is disposed between the bearing stationary ring (40) and the bearing rotary ring (10). A lubrication passage is provided in an end face of the bearing rotary ring (10).

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 lubricating tube includes an inner surrounding surface that has a non-circular cross-section, angularly spaced-apart inner lubricant-storing recesses, and guide surface portions each of which is interconnected between two adjacent ones of the inner lubricant-storing recesses. The inner lubricant-storing recesses and the guide surface portions constitute the inner surrounding surface and cooperatively define a roller passage hole. The inner lubricant-storing recesses are indented from the guide surface portions toward the outer surrounding surface. A slide rail device having the lubricating tube is also disclosed.

A rolling bearing having an inner raceway and an outer raceway and a plurality of rolling elements arranged therebetween. The rolling bearing is media-lubricated or oil-free lubricated. The lubricant forms an elasto-hydrodynamic lubricant film between the rolling elements and the raceways. At first use of the rolling bearing, at least one surface of the rolling bearing is coated with a protective fluid, preferably an oil-based preservative fluid. Also, a refrigerant compressor having such a rolling bearing.

A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers, and an annular cage having a plurality of cage pockets. Each of the cage pockets has a retainer configured to permit displacement of the tapered roller in a direction with a component in a radial direction, and restrict detachment of the tapered roller to an outer side in the radial direction by bringing the retainer into contact with a part of an outer peripheral surface of the tapered roller. The cage pockets include a first cage pocket having a first retainer with which a permissible amount of the displacement is a first displacement amount, and a second cage pocket having a second retainer with which the permissible amount of the displacement is a second displacement amount smaller than the first displacement amount.

A snap-fit ball bearing cage, including: a first ring-half supported for rotation around an axis of rotation and including a plurality of first curved surfaces; a second ring-half including a plurality of second curved surfaces and a plurality of first protrusions non-rotatably connecting the second ring-half to the first ring-half, each first protrusion forming a portion of a radially outer perimeter of the second ring-half, or each first protrusion forming a portion of a radially inner perimeter of the second ring-half; and a plurality of balls. The plurality of first curved surfaces and the plurality of second curved surfaces define a plurality of openings; the plurality of balls is disposed in the plurality of openings. Each first curved surface, included in the plurality of first curved surfaces, is a mirror image of a second curved surface included in the plurality of second curved surfaces.

A bearing cage includes a first circular ring; a second circular ring provided to be spaced apart from the first ring in a coaxial relationship with the first ring; a plurality of pillars provided in a circumferential direction of the first ring and the second ring, one end of the pillar being connected to the first ring and the other end of the pillar being connected to the second ring; a plurality of pockets provided in the circumferential direction and configured to provide a space in which a bearing roller is accommodated, the pocket being formed to be surrounded by the first ring, the pillars and the second ring; and first reservoirs provided in the pillars and comprising a first storage space for storing lubricant.