Patent ID: 6661143
Filing Date: 2003-12-09
Classification: F04D,F16C

Abstract:
A bearing unit comprising a magnetic bearing which supports a rotatable shaft in a non-contact condition, and a rolling bearing which does not support the rotatable shaft while the magnetic bearing supports the rotatable shaft, wherein the rolling bearing is arranged to be connected in the axial direction to the rotatable shaft for supporting the rotatable shaft upon rotation stoppage, the rolling bearing comprising a double row, angular ball bearing and provided on the side where thrust load is received or on the side where positioning in the axial direction is carried out, the double row, angular ball bearing having inner and outer races and balls between the inner and outer races, and wherein one of the inner and outer races is an integral race installed on the side of the rotatable shaft with a radical clearance between the integral race and the shaft in the non-contact condition, the other of the inner and outer races being of a split type, and the integral race being supported only by the split-type races through the balls, whereby a large thrust load from the rotatable shaft is borne by the rolling bearing upon the rotation stoppage.