A rolling element bearing includes an inner ring and an outer ring, with rolling elements therebetween. The plurality of rolling elements collectively define a pitch diameter. An electrically-conductive shunt ring has an outer diameter surface and an inner diameter surface, one of which contacting either the outer ring or the inner ring, and the other not directly contacting the rings. A plurality of fingers extend from the contacting diameter surface. A plurality of carbon fiber elements extend from each finger and contact the other of the rings, to conduct electrical current between the inner ring and outer ring. The non-contacting diameter surface of the shunt ring defines a diameter that exceeds the pitch diameter to enable free-flow of lubricant through the bearing.

A sealing device for a hub/wheel assembly with a roller bearing. The sealing device includes a guard, made of plastic. The guard is coupled to an outer ring of the bearing to seal off the bearing. The guard has a cylindrical mounting wall with an outer lateral surface coupled to an inner lateral surface of a collar of the outer ring, and a snap-engagement step for engaging with the collar made along the outer lateral surface so that it snap-fits in a contoured annular groove made along the collar about the axis. An annular gasket is made of elastomer and co-injection-molded inside an annular groove made in the cylindrical mounting wall on the same side as the snap-engagement step.

A sealing device for a hub/wheel assembly with a roller bearing, the sealing device comprising a guard, made of plastic, which is coupled to an outer ring of the bearing so as to seal off the bearing, and which has a cylindrical mounting wall having an outer lateral surface coupled to an inner lateral surface of a collar of the outer ring. The sealing device includes a snap-engagement tooth for engaging with the collar made along the outer lateral surface so that the snap-engagement tooth snap-fits in a contoured annular groove made along the collar about the axis and an annular gasket made of thermoplastic elastomer being co-injection-molded inside a gripping seat made in the cylindrical mounting wall on the same side as the snap-engagement tooth, substantially at a corner defined between the cylindrical mounting wall and an annular reading wall transverse to the cylindrical mounting wall.

A bearing assembly comprising a bearing cup having two ends, with a pair of outer raceways formed one adjacent each end of the bearing cup. A pair of bearing cones form a pair of inner raceways. Two rows of tapered roller bearings with each row received between one inner raceway and one outer raceway. A pair of wear rings are provided, each having a first axially inwardly directed end in engagement with an outwardly directed end of a bearing cone. A pair of seals each having a first end fitted into one into one of the bearing cup cylindrical counterbores. Each seal has a second end including a resilient element to form a seal with one of the wear rings. A second end of each wear ring is received in a cylindrical counterbore in each annular backing ring. A circular shroud is located radially outer and adjacent to one seal.

A cage has an annular portion positioned on an axially first side of balls and a plurality of cage bars provided to extend from the annular portion toward an axially second side. Pockets each housing a corresponding one of the balls correspond to areas each located on the axially second side of the annular portion and between two cage bars adjacent to each other in a circumferential direction. Each of the balls is exposed from axially-second-side ends of the corresponding cage bars over an axially-second-side range. An axial dimension of the range over which the ball is exposed from the axially-second-side ends is 30% or more and 50% or less of the diameter of the ball.

A bearing unit (10) has radially outer and inner rings (31), (33), rolling bodies (32), a cage (34) containing the rolling bodies, and two sealing devices (35) arranged axially on opposite sides of the bearing unit (10) and interposed between the radially inner ring (33) and the radially outer ring (31). Each sealing device (35) is provided with first shield (40) and a second shield (50). The first shield (40) is sealed, axially inwards, against a support surface (31) of the radially outer ring (31) and is stably inserted in a first seat (31a) of the radially outer ring (31). The second shield (50) is interference fitted on a radially outer surface (33a) of the radially inner ring (33) and axially outside the first shield (40). The first and second shields (40), (50) generate a tortuous path (P) therebetween to hinder the ingress of contaminants into the bearing unit (10).

In an embodiment, in a sliding component, a sliding face of a stationary-side seal ring 6 has a fluid circulation groove 10 communicating with a high-pressure fluid side via an entrance portion 10a and an exit portion 10b. A rotating-side seal ring 5 has a larger outer diameter and a smaller inner diameter than the seal ring 6. A groove 15 into which a claw is loosely fitted is provided on an outer periphery of the seal ring 5. A width of the groove 15 is smaller than a distance between the portion 10a and the 10b in the circumferential direction. WMR/WSR is set within a range of 0.75<WMR/WSR<1.4 (WMR is a face width between an inner diameter of the groove 15 and an inner diameter 6b of the sliding face; WSR is a face width of the sliding face).

A co-mouldable tube (10) includes with two rolling bearings (20) arranged along a respective axis (A) of rotation. A spacer (40) is interposed between the two rolling bearings (20) so as to give the co-mouldable tube (10) structural rigidity. A cylindrical containment sleeve (5) is co-moulded around the two rolling bearings (29) and the spacer (40). Two metal bushes (60) are interposed between the cylindrical sleeve (50) and the two rolling bearings (20) so as to be co-moulded together with the said cylindrical sleeve (50).