A rotation induction device for a vehicle includes: an upper case member composed of a synthetic resin material and having a piston rod disposed therethrough; a lower case member composed of a synthetic resin material, disposed under the upper case member, and having the piston rod disposed therethrough; a center plate composed of a synthetic resin material, disposed between the upper and lower case members such that the piston rod passes through the center plate, and configured to induce either one or both of the upper and lower case members to rotate; and a stress distribution part formed on the center plate, and configured to distribute stress caused by a vertical load.

Provided is a friction design method capable of estimating sliding friction generated between mutual sliding surfaces of two sliding members lubricated with lubricant with high precision. The friction design method sets a friction coefficient μ in a sliding surface model corresponding to mutual sliding surfaces of two sliding members (2 and 3) lubricated with lubricant (step S1), and, based on a correlation between the friction coefficient μ and an oil film parameter (Λ(Rk) or Λ(Rk+Rpk)) calculated using a core portion level difference (Rk) or a sum of the core portion level difference (Rk) and reduced peak height (Rpk) as a parameter representing surface roughness in the sliding surface model (step S2), sets a target value for surface roughness of the sliding surfaces required to be controlled as a product (steps S3 to S6).

Wettable structures that retain liquid layers are defined at surfaces of substrates. The wettable structures include grooves or ridges that are spaced apart by between 10 nm and 10 μm and can be defined in substrate or in a layer formed on a surface of the substrate. In typical examples, wettable structures are defined with hydrophobic materials or at hydrophobic surfaces and produce hydrophilic surfaces.

A holder has a protrusion which protrudes from a side surface at a side opposite in an axial direction with respect to a rolling element held in a pocket toward the side opposite in the axial direction. An oil supply hole which penetrates through the holder from the side surface to a surface at a side of the rolling element in the axial direction is formed in the holder. When the holder rotates, the protrusion guides oil into the oil supply hole, and the oil is introduced from the side surface of the holder to the surface on the side of the rolling element.

A bearing cage for a rotor bearing of a turbomolecular pump. The bearing cage includes 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 includes a sump.

In a tapered roller bearing, a large-diameter-side annular portion includes large-diameter-side pocket surfaces opposed to the large end surfaces of the respective tapered rollers; and oil retaining recesses each having an opening spanning the inner peripheral surface of the large-diameter-side annular portion and each of the large-diameter-side pocket surfaces. Each oil retaining recess has an inner surface having a radially inwardly facing surface portion, the radially inwardly facing portion being an inclined surface radially inwardly inclined toward the corresponding tapered roller.

A holder has a protrusion which protrudes from a side surface at a side opposite in an axial direction with respect to a rolling element held in a pocket toward the side opposite in the axial direction. An oil supply hole which penetrates through the holder from the side surface to a surface at a side of the rolling element in the axial direction is formed in the holder. When the holder rotates, the protrusion guides oil into the oil supply hole, and the oil is introduced from the side surface of the holder to the surface on the side of the rolling element.

An outer-ring lubrication groove pattern formed in an outer-race raceway surface and an inner-race lubrication groove pattern formed in an inner-race raceway surface of a wave generator bearing of a strain wave gearing device are patterns in which linear lubrication grooves having very small widths and depths of several micrometers or less are arranged at fine pitches of several micrometers or less. The inner-race lubrication groove pattern includes a second groove pattern formed in long-axis-side inner-race raceway surface portions to hold the lubricant, and a first groove pattern formed in short-axis-side inner-race raceway surface portions to hold the lubricant and guide the lubricant to the second groove pattern. This configuration improves the contact state between balls and the inner-race and outer-race raceway surfaces of the wave generator bearing, thus reducing the coefficient of friction therebetween.

A thrust ball bearing retainer a large size of bearings with the bearing raceways being modified using a surface enhancement process such as hard anodizing coating, which provides low friction coefficient and initial wear rate. The retainer material is selected to be molded, synthetic resin, self-lubricated material reinforced with carbon fiber, molybdenum disulfide, and PTPE. This lubrication system eliminates the thermal induced bearing torque effect due to viscosity. The retainer contains multiply segments with an inner race guided configuration, an alternative ball pocket cross section design and a ball pocket slotted configuration (1) to reduce the thermal induced effects due to coefficient of thermal expansion mismatch between the raceway and the retainer material (2) to enhance the producibility of the retainer due to out-of-round, out-of-flatness and torsional wrap, and (3) to reduce the manufacturing cost. The pocket design with an oval cross section instead of a circular cross section also reduces the localized thermal induced effect which would otherwise result in a pinching condition between the ball and the retainer. The alternative slotted retainer pocket design is used to increase the compliance between ball/pocket interfaces, which helps to reduce the dynamic induced effects. The ends of the retainer segments are designed to reduce the interactive transferring, circumferential force between two adjacent segments.

A deep groove ball bearing includes an outer ring, an inner ring, a cage, and steel balls. The cage is provided between the outer ring and the inner ring. Pockets are formed in the cage, and the steel balls are placed in the pockets. The cage is split into an upper cage body and a lower cage body. Pocket grooves are formed alternately in each of the upper cage body and the lower cage body. A connecting portion is provided between adjacent pocket grooves in the upper cage body. A positioning portion is provided between adjacent pocket grooves in the lower cage body. An insertion piece and an insertion groove are provided between the connecting portion and the positioning portion. The insertion piece and the insertion groove are configured to be fixed with each other to form a fixed connection between the upper cage body and the lower cage body.

A deep groove ball bearing includes an outer ring, an inner ring, a cage, and steel balls. The cage is provided between the outer ring and the inner ring. Pockets are formed in the cage, and the steel balls are placed in the pockets. The cage is split into an upper cage body and a lower cage body. Pocket grooves are formed alternately in each of the upper cage body and the lower cage body. A connecting portion is provided between adjacent pocket grooves in the upper cage body. A positioning portion is provided between adjacent pocket grooves in the lower cage body. An insertion piece and an insertion groove are provided between the connecting portion and the positioning portion. The insertion piece and the insertion groove are configured to be fixed with each other to form a fixed connection between the upper cage body and the lower cage body.