HYDRODYNAMIC PRESSURE BEARING DEVICE

摘要

PURPOSE: A hydrodynamic pressure bearing device is provided to improve the rotation efficiency be reducing the friction when generating the hydrodynamic pressure. CONSTITUTION: The dynamic pressure bearing device which generates dynamic pressure by the fluid filled between a first and a second inner face and the circumference of the bearing comprises:a first magnetic body to generate magnetic force on the upper part of the second inner face of a bushing; a second magnetic body to generate the magnetic force of opposite direction to the magnetic force of the first magnetic body on the upper part of the bearing;:Herein, in a processing of inserting the bushing on the upper part of the bearing, the concentricity of the bearing and the bushing is automatically kept by the repulsive magnetic force between the two magnetic body if the first magnetic body is inserted into the second magnetic body.