A bearing unit including a radially outer ring, a radially inner ring, a row of rolling bodies interposed between the radially outer ring and the radially inner ring, a containment cage for keeping the rolling bodies in position defined by a plurality of arched bridges and a plurality of flattened connecting elements interposed between the bridges, a sealing screen interposed between the radially inner ring and the radially outer ring made of composite material provided with an annular central portion having a toroidal surface, a radially inner lug, and a radially outer deflector projecting towards the cage, and a channel between the cage and the sealing screen, axially defined by the lug, the toroidal surface, and the deflector.

A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers provided in an annular space formed between the inner and outer rings and rolling on an inner raceway surface and an outer raceway surface, and an annular cage that holds the tapered rollers. The cage has a small annular portion positioned toward an axially first side with respect to the tapered rollers, a large annular portion positioned toward an axially second side with respect to the tapered rollers, and a plurality of cage bars that couples the small annular portion and the large annular portion together. A minute clearance is formed between the inner ring and the large annular portion and between the outer ring and the large annular portion, respectively.

Provided is a bearing lubrication structure for a rotation unit having a bearing that is of a grease lubrication type in which the bearing is provided at both sides thereof with a seal structure, wherein the grease lubrication performance is improved. The bearing is provided on both sides thereof with fixed-side seal portions, and rotating side seal portions that are opposed thereto, respectively. The fixed-side seal portion is provided with a shield. The distance from the inner periphery of the shield to the axis of the rotary shaft varies depending on the location of a point on the inner periphery. The shield, which is one of the two shields, and the shield, which is the other one, are arranged so as not to have plane symmetry.

A bearing retainer for use in a bearing is provided. The bearing includes an inner ring, rolling elements and an outer ring. The bearing retainer includes a body. The body defines an inner periphery and an outer periphery of the body. The body further defines a plurality of inner walls. Each inner wall defines an opening extending from the inner periphery to the outer periphery of the body. The plurality of openings are adapted to receive one of the rolling elements. The inner walls are adapted to keep the rolling elements in a spaced apart relationship. At least one of the inner walls defines a aperture through the body. The aperture is adapted for storing lubrication therein.

A rolling bearing unit provided with a radially outer ring having an assembly groove, two radially inner rings, two series of rolling elements interposed between the radially outer ring and the radially inner rings and defining between them a first internal grease reservoir. The groove is arranged in an axially intermediate position with respect to the two radially inner rings and a grease dispensing device is housed inside the groove of the radially outer ring and is in turn provided with a second grease reservoir formed inside the radially outer ring and communicating with the first reservoir via the groove. A permeable retaining wall housed is inside the groove so as to retain the grease inside the second reservoir and allow it to flow out towards the first reservoir during operation of the bearing unit, dispensing it in a controlled manner.

A guide carriage (1) of a linear guide includes a circulation channel (8) for rolling bodies (2), which is formed from a load section (3), two deflection sections (5) and a return section (4). A valve (16) arranged in a lubricant channel (10) to prevent the back flow of lubricant from the circulation channel (8) is arranged at a supply point (13) for supplying lubricating agent to one of the deflection sections (5), and the deflection section (5) is delimited by a deflection shell (9) located in an end piece (7). The valve (16) is formed integrally with at least one of the elements deflection shell (9) and end piece (7).

A rolling element bearing (1) that includes a plurality of balls (4) as rolling elements guided in a cage (5). A lubricant channel (19) is formed in snap-in pockets (8) in a region between a lateral ring section (6) and the central ball (4) track, between the ball (4) and the adjoining web section (7) and/or the adjoining lateral ring section (6), which fluidically connects the radial outer side and the radial inner side of the cage (5). In order for the rolling element bearing (1) lubricant supply to be improved, on the web sections (7), an outer block section (10) is formed on the radial outer side and/or an inner block section (11) is formed on the radial inner side, which project relative to the lateral ring section (6), in the radial direction in relation to the bearing axis L, and reduce the available rolling element space between two adjoining balls (4).

A retainer is rotationally driven about a axis of a ball bearing, and convex areas having pockets provided therein along a ball pitch circle of the retainer and concave areas between adjacent pockets is detected by a sensor. Grease is discharged according to phases of the convex areas and concave areas in the rotationally driven retainer from a dispenser having grease discharge ports arranged to face an annular space.

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.

The present invention relates to wind turbine generator (WTG) with a ball bearing (31) supporting a rotating shaft. A suction provider (35), e.g. a rotating disc, is provided next to the ball bearing. An opposite grease reservoir (41) supplies the ball bearing with grease during rotational operation, the grease reservoir further having a shape so that a point (43) of the at least one grease reservoir being closest to the rotating shaft and a grease inlet of the ball bearing are adjoining. The suction provider creates a pressure which is slightly lower than atmospheric pressure, thereby creating a suction of grease (47) through the ball bearing from the grease reservoir, which aids in distributing the grease in the ball bearing. The invention provides an improved ball bearing having an extended lifetime of up to e.g. 7-10 years.