A rolling bearing including a conductive shield and an insulation coating is provided. The rolling bearing assembly includes a fixable bearing ring including a first raceway and a rotatable bearing ring including a second raceway. A roller assembly includes a cage and a plurality of rolling elements are located in the cage and supported to roll on the first raceway of the fixable bearing ring and the second raceway of the rotatable bearing ring. A shield extends between the fixable bearing ring and the rotatable bearing ring. The shield includes a first end connected to the fixable bearing ring, and at least one electrically conductive element extends from a second end of the shield and contacts the rotatable bearing ring. A conductive extension on the first end of the shield is connectable to ground. The insulation coating covers surfaces of the fixable bearing ring outside of the first raceway.

A sensor (20) arranged in a deep groove ball bearing (10) includes an encoder (22) attached at an inner ring (1) to be rotatable integrally with the inner ring (1), and a magnetism detecting element (24) attached at an outer ring (2) via a sensor housing (26) to face the encoder (22) with a sensor gap. Then, the magnetism detecting element (24) is capable of measuring a rotating state of the encoder (22) rotating in the rotating state identical to that of the inner ring (1) in conjunction with a rotation of the inner ring (1). The deep groove ball bearing (10) includes a foreign material entering prevention portion that prevents a foreign material from entering the inside of the bearing from a gap between the inner ring (1) and the sensor housing (26). The size of the gap between the inner ring (1) and the sensor housing (26) is substantially identical to the sensor gap between the magnetism detecting element (24) and the encoder (22), and the gap configures non-contact seal and functions as the foreign material entering prevention portion.

A rolling bearing includes an inner ring, an outer ring, a plurality of balls, a cage that holds the balls, and a sealing device that is attached to each of opposite sides of the outer ring in an axial direction to prevent foreign matter from entering inside the bearing. A noise-reduction portion that attenuates sound inside the bearing is formed on at least one of a surface of the cage and a bearing inner-side surface of the sealing device.

A seal unit for a rolling-element bearing having an inner bearing ring and an outer bearing ring. The seal unit includes an at least part-ring shaped element having a seal lip, the at least part-ring shaped element is configured for attachment to the inner bearing ring, and the outer bearing ring is tiltable through a limited angle with respect to the inner bearing ring. Also a rolling-element bearing having such a seal unit.

This rotative assembly comprises a first element rotating with respect to a second element around a rotation axis, at least one bearing arranged between the first and second element, and at least one sealing element arranged between the first element and the second element. The sealing element is housed in a peripheral groove provided on the first element, and comprises at least one sealing lip resting on a surface of the second element. The first element comprises an extraction groove realized on a radial surface of the first element, and which forms an empty space below an internal surface of the sealing element and creates an axial access to said empty space from an axial end surface of the first element.

A deep groove ball bearing includes an outer ring, an inner ring, a plurality of balls, and a seal member. An axial cross-sectional width is smaller than a radial cross-sectional height, a thickness of the inner ring is greater than a thickness of the outer ring, and a pitch diameter of the ball is larger than a median diameter between an inner diameter of the inner ring and an outer diameter of the outer ring A radial dimension between an outer diameter of a shoulder portion of the inner ring and an inner diameter of the seal member is greater than the thickness of the outer ring. As a result, width and weight can be reduced, a load capacity can be secured, grease leakage can be prevented, and a service lifespan can be extended.

A bearing unit includes rolling bodies between radially inner and outer rings and a seal element extending between the rings, the seal element including a metallic shield and an elastomeric coating overmolded on the shield. The coating includes an anchor body mounted in a seat of the outer ring, and the anchor body includes a first anchor lip on an axially inner side of the anchor body contacting the seat of the radially outer ring and a second anchor lip located on an axially outer side of the anchor body contacting and forming a seal at a location on the radially outer ring. A concave radially outwardly facing connecting surface extends from the first anchor lip to the second anchor lip and is configured to reduce a compression of the anchor body when the anchor body is inserted into the seat.

A first seal and a second seal seal an annular space between an outer ring and an inner ring by sandwiching a retainer. A stator including a coil is supported by the first seal and is opposed to a magnetic ring. A sensor, a wireless communication circuit, and a power supply circuit are supported by the second seal. A wire electrically connects the coil and the power supply circuit. The wire includes a part disposed in a groove extending in an axial direction of a bearing on an outer peripheral surface of the outer ring.

A grease composition includes: (A) a trimellitic acid ester, (B1) a phenyl naphthylamine, (B2) an alkyl diphenylamine, (C1) a succinic acid half ester, (C2) a sorbitan monoester, and (D) a urea-based thickener. This grease composition is excellent in anti-flaking, rust prevention, and oxidation resistance properties, and furthermore, a fatigue life of a rolling device and the like in which the grease is enclosed can be maintained for a long time.