| 摘要 |
A motor ( 100 ) having a dynamic pressure fluid bearing is composed of a hub ( 2 ), a rotor ( 4 ) provided with a shaft ( 7 ) of which one end portion is securely fastened by the hub ( 2 ) and another end portion is formed with a flange ( 8 ), and a stator ( 3 ) composed of a sleeve section ( 9 ) for axially sustaining the shaft ( 7 ) so as to be rotatable freely and a thrust plate ( 10 ) secured on the sleeve section ( 9 ) so as to confront with the flange ( 8 ), wherein the dynamic pressure fluid bearing is composed of a thrust dynamic pressure fluid bearing constituted by the flange ( 8 ) and the thrust plate ( 10 ), and wherein the shaft ( 7 ) is provided with a through hole ( 17 ) bored through the shaft ( 7 ) from the one end surface to the other end surface, and wherein the through hole ( 17 ) is formed in a shape having an opening to the other end surface of the shaft ( 7 ) by way of a funnel shaped section ( 17 c) of which diameter gradually increases toward the other end surface of the shaft ( 7 ). |
