Patent ID: 8510954

Claim:
A method for manufacturing a bearing unit comprising the steps of: providing an outer race ring, an inner race ring having an inner envelope surface with a tapering saw-tooth profile extending in an axial direction of the inner race ring, a thin-walled sleeve having an axially extending slot and a tapering saw-tooth profile on an outer envelope surface, the sleeve saw tooth profile being configured to engage with the saw-tooth profile in the inner envelope surface of the inner race ring, a flange member connected to the exterior of the thin-walled sleeve, and a tightening member disposed within the flange and configured to displace at least one of the sleeve and the inner race ring with respect to the other one of the sleeve and the inner race ring, subjecting the surface of the inner race ring to a soft turning operation, and subjecting at least a surface layer of the inner race ring facing the sleeve to an induction hardening operation.