HYDRODYNAMIC BEARING ASSEMBLY AND MOTOR INCLUDING THE SAME

摘要

According to an embodiment of the present invention, a hydrodynamic bearing assembly comprises: a sleeve which supports a shaft to rotate and where a first circulation hole is formed to penetrate the inner and outer circumferential surfaces thereof; a sleeve housing where the sleeve is inserted; and a second circulation hole formed on the outer circumferential surface of the sleeve and the inner circumferential surface of the sleeve housing in order to communicate with the first circulation hole. In the second circulation hole, the size of the upper part can be bigger than the size of the lower part in a shaft direction.