Bearing unit, and motor using same

摘要

A bearing unit is provided which includes a shaft ( 51 ) to support rotatably, radial bearing ( 55 ) to support the shaft ( 51 ) circumferentially, a thrust bearing ( 66 ) to support the shaft ( 51 ) in the direction of thrusting, and a housing ( 56 ) having the radial bearing ( 55 ) and thrust bearing ( 66 ) disposed therein and in which a viscous fluid ( 57 ) is filled. The housing ( 56 ) has a sealed structure except for a shaft insertion hole ( 65 ) formed therein and through which the shaft 51 is introduced. Between the outer surface of the shaft ( 51 ) and the inner surface of the shaft insertion hole ( 65 ), there is defined a gap ( 69 ) having a sufficient width to prevent the viscous fluid ( 57 ) filled in the housing ( 56 ) from leaking out of the latter. The housing ( 56 ) is formed as a one-piece structure by molding a synthetic resin.