Patent ID: 7200983

Claim:
A supporting disc for a supporting disc bearing for open-end spinning rotors, comprising a disc-like base body having on its outer circumference a tire-like covering as well as an end face, in which a cylinder-shaped permanent magnet is inserted in a through bore hole and arranged at a distance from the axis of the supporting disc, which through bore hole is filled in by the permanent magnet only up to a gradation of diameters serving as a stopping surface, while the remaining part of the through bore hole serves as a mass balancer and is filled in by a filling material which is lighter in comparison to the specific weight of the permanent magnet and the base body, wherein the permanent magnet is arranged in the transition area between the base body and the tire-like cover, and wherein the part of the through bore hole not filled out by the permanent magnet is filled out by the tire-like cover.