Patent ID: 6916160
Filing Date: 2005-07-12
Classification: F04D,H02K

Abstract:
1. A blower having an impeller rotated by means of a motor, comprising: a base for supporting the motor in a frame, the base provided at a central portion of the frame and supported at the central portion of the frame by means of stays; and a bearing apparatus for supporting a central portion of the impeller, the bearing apparatus including: a sleeve, a stepped shaft including a larger diameter portion and a reduced diameter portion, a first raceway formed around an outer peripheral surface of the larger diameter portion, a second raceway formed on an inner peripheral surface of the sleeve so as to correspond with the first raceway, balls of a first row interposed between the first and second raceways, an inner ring to the sleeve fit over the reduced diameter portion of the shaft and secured thereto, a third raceway formed around an outer peripheral surface of the inner ring, a fourth raceway formed on the inner peripheral surface of the sleeve so as to correspond with the third raceway, balls of a second row interposed between the third and fourth raceways, and a chamber with front and rear portions formed in the base for accommodating electrical components, the chamber having an opening at the rear portion thereof, wherein the rear opening of the chamber is occluded by a cover detachably mounted on the base.