A DEVICE FOR CENTERING A ROTATIONAL UNIT

摘要

A device for centering a rotational unit (1) on a rotatable hub (2) for rotation of the unit together with the hub. A centering surface (9) which extends around the circumference of the hub extends essentially from a mounting edge (10, 11) for the rotational unit to a stop surface (8) which determines the axial position of the rotational unit. The rotational unit presents in a corresponding way a centering surface (7) which in its one end transcends into a stop surface (6), which determines the radial position and which is intended for contact with the stop surface of the hub. One of the centering surfaces (7, 9) is divided into a first centering section (12) with a certain larger clearance to the second centering surface (9, 7) and a second centering section (13) with a certain smaller clearance to said second centering surface. The first centering section extends across the main part of the axial distance (b) from the stop surface (8) of the hub to its mounting edge (10, 11). The second centering section extends across a minor section (a) of the axial distance from the stop surface to the mounting edge of the hub.