Abstract: The invention relates to a bearing arrangement and parts suitable for said arrangement, such as a roller bearing, which is suitable for the absorption of shock loads. To that purpose those parts which come into contact with each other under shock loads or great loads are provided on one of the adjacent outer contact surfaces facing each other with a friction-reducing coating. Such a coating may contain molybdenum or bronze and is suitably applied by means of a thermal spraying method, such as wire spraying. The bearing arrangements provided by the invention have a significantly longer operational life.

Abstract: A roller bearing constructed in accordance with the invention comprises inner and outer rings and rollers therebetween as is known. The rings have no ribs, flanges or grooves but instead axial inner surfaces of the rings provide raceways which are substantially convex and the axial outer surfaces of the rollers are substantially concave to match. These concave and convex surfaces contact one another over contact zones. Each roller has an external surface which is asymmetrical relative to the center of the roller and the geometry is such that during use frictional moments develop at the contact zones between the rollers and the rings to generate a positive skew force on the rollers. This renders the bearing self-tracking.

Abstract: A self-contained bearing unit rotatably supports a tool spindle in a bore of a machine tool housing wall. The unit employs an angular-contact ball bearing and the outer race is displaced axially to alter the pre-loading by supplying pressure fluid to a chamber containing a resiliently deformable seal or an annular bellows device.