Head drum assembly having a pre-loading sheet sleeve structured to facilitate its connection with a shaft and a rotor plate and method for fixing the same onto the shaft

摘要

A head drum assembly is provided with a flange fixed around a rotating shaft and including an upper abutment stopper for preventing an inner ring of an upper ball bearing from moving up with respect to the rotating shaft and a pre-loading sleeve having a sleeve portion fixed around the rotating shaft in a press-fit relationship therewith, the sleeve portion having a lower abutment stopper for pre preventing an inner ring of a lower ball bearing from moving down with respect to the rotating shaft.