Patent ID: 8702310

Claim:
A hydrodynamic bearing assembly comprising: a first sleeve; a second sleeve fixed to an inner surface of the first sleeve, the second sleeve including a shaft hole to have a shaft rotatably installed therein; and a cover member covering the shaft hole at a lower portion of the shaft hole in an axial direction, the inner surface of the first sleeve and an outer surface of the second sleeve being provided to form a space part therebetween, an inner surface of the second sleeve being provided with depression parts depressed in an outer diameter direction between portions in which radial bearings are formed, such that the portions in which the radial bearings are formed are provided with bearing closure adhesion parts allowing the portions in which the radial bearings are formed to be closer to the shaft than portions other than the portions in which the radial bearings are formed, an upper portion of the space part being provided with a first upper through-hole in communication with the shaft hole, the upper portion of the space part being provided with a second upper through-hole in communication with the depression part, and a lower portion of the space part being provided with a second lower through-hole that is in communication with the depression part, and the lower portion of the space part being provided with a third through-hole that is in communication with the shaft hole, wherein an upper end and a lower end of the inner surface of the first sleeve are coupled to the outer surface of the second sleeve.