A device includes a lower support cap, an upper bearing cap, at least one bearing disposed between the caps and at least one annular seal. The seal provides a claw secured by mechanical connection to the upper support cap, a sealing lip extending obliquely from the claw in the direction of the upper bearing cap.

A device includes a lower support cap, an upper bearing cap, at least one bearing disposed between the caps and at least one annular seal. The seal provides a claw secured by mechanical connection to the upper support cap, a sealing lip extending obliquely from the claw in the direction of the upper bearing cap.

The unit includes a lower support cap, an upper bearing cap, and at least one bearing disposed between the caps. The unit further includes at least one stiffening insert provided with a plurality of axial through-holes, through which connecting sections of a plastics cap are accommodated.

The unit includes a lower support cap, an upper bearing cap, and at least one bearing disposed between the caps. The unit further includes at least one stiffening insert provided with a plurality of axial through-holes, through which connecting sections of a plastics cap are accommodated.

A device includes a bottom support cover, a top bracing cover, an annular passage being defined between the covers, at least one bearing disposed between the covers, and at least one annular seal. The seal provides a fixing portion secured by mechanical link to a first cover out of the bottom support cover and the top bracing cover and at least one sealing lip extending towards the second cover in such a way that a free end of the lip comes to bear via a sliding-contact portion with a sealing surface of the second cover. The second cover is provided with an annular protection rim protruding from the sealing surface, the protection rim being offset towards the annular passage facing the portion of contact of the free end of the sealing lip with the sealing surface.

A device includes a bottom support cover, a top bracing cover, an annular passage being defined between the covers, at least one bearing disposed between the covers, and at least one annular seal. The seal provides a fixing portion secured by mechanical link to a first cover out of the bottom support cover and the top bracing cover and at least one sealing lip extending towards the second cover in such a way that a free end of the lip comes to bear via a sliding-contact portion with a sealing surface of the second cover. The second cover is provided with an annular protection rim protruding from the sealing surface, the protection rim being offset towards the annular passage facing the portion of contact of the free end of the sealing lip with the sealing surface.

A thrust bearing has an outer race and an inner race arranged for rotation relative to the outer race about an axis of rotation. Multiple rolling elements are positioned between the inner and outer races. A cage is positioned between the inner and outer races and configured to engage with the rolling elements to align the rolling elements into multiple rows, with the rows circumferentially spaced apart from one another.

A thrust bearing has an outer race and an inner race arranged for rotation relative to the outer race about an axis of rotation. Multiple rolling elements are positioned between the inner and outer races. A cage is positioned between the inner and outer races and configured to engage with the rolling elements to align the rolling elements into multiple rows, with the rows circumferentially spaced apart from one another.

A slew bearing includes a stationary bearing ring to be fixed to a base, and a moveable bearing ring to be fixed to a moveable object, wherein the stationary bearing ring and the moveable bearing ring are configured to enable rotation of the moveable bearing ring relative to the stationary bearing ring about a rotation axis. A main axial bearing and an auxiliary bearing are provided between the stationary bearing ring and the moveable bearing ring, wherein the moveable bearing ring includes one or more main portions and one or more auxiliary portions, which one or more main portions are moveable relative to the one or more auxiliary portions between an operational position, in which the main axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring, and a raised maintenance position, in which the auxiliary axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring and the main bearing is allowed to be inspected and/or maintained so that the slew bearing during inspection and/or maintenance is still operational.

The dental handpiece consists of a housing with a handle and a turbine that can be operated with compressed gas or compressed air. The rotational movement of the turbine driven by compressed gas is transmitted to the dental tool via a rotor shaft and a chuck. The rotor shaft is rotatably supported by at least one axial groove ball bearing. The radial rigidity required for operating a dental handpiece is achieved by axially preloading the ball bearings. Projections on the housing and the shaft disc of the at least one axial groove ball bearing allow the axial groove ball bearing to be used as radial groove ball bearings. The proposed design of the dental handpiece exhibits little power loss or frictional loss in comparison to dental handpieces with radial groove ball bearings, and slip and drilling friction components can be virtually completely prevented in particular.