Patent ID: 6379129
Filing Date: 2002-04-30
Classification: F04D

Abstract:
A blower having an impeller adapted to be rotated upon energizing the blower comprising;a bearing apparatus for supporting a rotational center portion of the impeller, the bearing apparatus including; a sleeve, a stepped shaft including a larger diameter portion and a reduced diameter portion provided at one end thereof, the first rolling contact groove formed at an appropriate position around the outer peripheral surface of the larger diameter portion, the second rolling contact groove formed on an inner peripheral surface of the sleeve so as to correspond with the first rolling contact groove, balls of the first row interposed between the first and second grooves, an inner race fit over the reduced diameter portion and secured thereto with an appropriate pre-loading force, the third rolling contact groove formed around an outer peripheral surface of the inner race, the fourth rolling contact groove formed on the inner peripheral surface of the sleeve so as to correspond with the third rolling contact groove, and balls of the second row interposed between the third and fourth grooves.