HYDRODYNAMIC BEARING ASSEMBLY AND MOTOR INCLUDING THE SAME

摘要

PURPOSE: A hydrodynamic bearing assembly and a motor including the same are provided to prevent lubricating fluid from leaking with enhanced sealing between a stopper and a sleeve by using a shape memory alloy. CONSTITUTION: A hydrodynamic bearing assembly comprises: a fixed member; a rotating member which rotates relatively to the fixed member; a sleeve(120) into which a shaft is rotatably inserted; a hub(210) which is provided at the upper end of the shaft and has a main wall part extended downwardly in an axial direction; and a stopper(190) which is provided in the inner side of the main wall part. Oil is interposed in a gap between the fixed member and the rotating member. At least a part of the main wall part or the surface of the stopper is made of a shape memory alloy.