A front bearing (tapered roller bearing) includes an inner ring, an outer ring, a plurality of tapered rollers, a cage, and a lubricating oil holding member. The lubricating oil holding member includes: a cylindrical portion having an axial length from a large diameter-side outer ring end surface to an end portion of the cage and capable of resisting a pressing force for press-fitting the outer ring; a fitting hook that is connected to one end of the cylindrical portion, that projects in the axial direction from an abutment surface which is in surface contact with the large diameter-side outer ring end surface, and that is fitted in an engagement groove portion provided in an outer peripheral surface of the outer ring; and a projection that projects radially inward from an inner peripheral surface of the cylindrical portion.

A motion guiding device includes a supporting body and a moving body. The moving body includes a moving body main body, a cover body and a circulation component. The cover body includes a first lubrication groove. The motion guiding device is further provided with a lubrication path component, the lubrication path component including a second lubrication groove having a cross-sectional area less than that of the first lubrication groove. When a lubricating oil is used as the lubricant, the lubricant is supplied by a lubricating oil lubrication path formed by the first lubrication groove and the second lubrication groove. In this way, in the motion guiding device, the lubrication path may be widened when the lubricating grease is used to lubricate, while the lubrication path may be narrowed when the lubricating oil is used to lubricate, so that a good lubrication may be easily achieved.

A cage and roller assembly includes a plurality of rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at the raceway surface. The cage includes a pair of annular portions, and a plurality of cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. The rollers are housed in pockets each formed between the pair of annular portions and between the cage bars that are adjacent to each other in the circumferential direction. The cage has an inner recessed groove that is provided on a radially inner surface of the cage bar and extends through the annular portions in an axial direction.

A cage segment for a rolling bearing, includes a central portion extending in the circumferential direction and delimiting a plurality of through pockets for receiving rollers. The central portion have first, and second walls extending in the circumferential direction and provided with internal surfaces opposite one another and forming abutment surfaces for the end faces of the rollers. A first lateral shoulder outwardly extends from the first wall of the central portion, and a second lateral shoulder outwardly extends from the second wall of the central portion by being oriented at right angles to the first lateral shoulder, and at least one outwardly open recess being formed on each of the first and second lateral shoulders.

A roller-type linear guide with an oil storage function and an oil storage accessory thereof are disclosed. The roller-type linear guide includes a rail, a slider unit, a plurality of rollers, and an oil storage member. The slider unit is mounted on the rail to form a circulation passage. The rollers are disposed in the circulation passage to drive the slider unit to reciprocate on the rail. The rollers each have a rolling surface. A non-load passage of the circulation passage has two first inner surfaces facing the rolling surface. The oil storage member is disposed in a concave portion of the first inner surfaces, thereby lubricating the rollers running in the non-load passage. The oil storage accessory is disposed in a through hole of the slider rigid body to form the non-load passage.

A rolling bearing includes a first raceway surface; a second raceway surface; and a plurality of rolling elements rotatably arranged between the first raceway surface and the second raceway surface. Multiple recesses are provided on at least one surface among the first raceway surface, the second raceway surface, and rolling surfaces of the plurality of the rolling elements. An area ratio of openings of the recesses to the at least one surface is in a range of 5% to 37%. An equivalent circle diameter of the opening of each of the recesses is in a range of 1 μm to 27 μm. A depth of each of the recesses in a direction normal to the at least one surface is in a range of 3 μm to 10 μm. A surface waviness of the at least one surface excluding the recesses is smaller than or equal to 0.2 μm.

First and second bearing cage halves each having an annular base body and a plurality of pins extending from the base body and a plurality of pin receptacles, the first and second cage haves forming a bearing cage when the pins are received into the pin receptacles. A body of sacrificial material is located on the pins and/or in the pin receptacles which body is configured to be melted ultrasonically to join the first cage half to the second cage half and form the bearing cage.

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.

A sealed universal joint bearing includes a pot-shaped component having a disk-shaped base and a cylindrical wall projecting from a periphery of the base, and an inner surface of the base and an inner surface of the cylindrical wall define an interior of the pot-shaped body. At least one row of rolling elements are configured to roll along the inner surface of the cylindrical wall. A flange in the interior of the pot-shaped component has a flange surface against which end sides of the rolling elements are configured to slip during bearing operation, and the flange surface includes at least one formation configured to reduce a contact area between the flange surface and the end sides of the rolling elements.

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.