| 摘要 |
It is an object of the invention to provide a hydrodynamic bearing which can be easily worked and assembled and in which a liquid is prevented from leaking. In order to attain the object, in a hydrodynamic bearing including: a shaft having two radial flanges which are axially separated from each other by a predetermined distance; a sleeve through which the shaft is passed and which is pressingly held between the radial flanges; a radial dynamic pressure bearing portion which is formed between the shaft and the inner peripheral face of the sleeve; and pressure equalization passages which are respectively formed in the sleeve and at plural positions on a circumference, and through which the end faces of the sleeve communicate with each other, the shaft relatively rotating with respect to the sleeve, the sleeve is formed by an integral member, the pressure equalization passages are formed by plural holes through which the end faces of the sleeve communicate with each other, and liquid closing members which opposingly surround side faces of the radial flanges are fixed to the end faces of the sleeve with forming a predetermined gap, respectively.
|
