SPINDLE MOTOR AND HARD DISK DRIVE INCLUDING THE SAME

摘要

A spindle motor according to an embodiment of the present invention includes: a shaft including a fixing groove on the lower part; a lower thrust member which includes a fixing unit inserted into the fixing groove, a disc unit extended from the fixing unit to the outside in a radial direction, and an extension unit extended from the disc unit in a shaft direction; a base member coupled to the extension unit; a rotation member which has a bearing gap and the shaft and is arranged to be rotated around the shaft; a first sealing unit arranged between the upper surface of the extension unit and the rotation member; and a second sealing unit arranged between the inner circumferential surface of the base member and the outer circumferential surface of the rotation member.