FLUID DYNAMIC BEARING ASSEMBLY

摘要

PURPOSE: A fluid dynamic pressure bearing assembly which is mounted on a motor and form dynamic pressure is provided to multiply the length of a bearing span by reducing an axial length of a top radial bearing part. CONSTITUTION: A fluid dynamic pressure bearing assembly comprises a sleeve(120), and upper and lower radial bearing parts(130,140). A shaft(110) is inserted and installed in the sleeve. The upper and lower radial bearing parts are formed on the outer circumference of the shaft or the inner circumference of the sleeve. The interval gap between the lower part radial bearing part and the side faced in the lower part radial bearing part is larger than the surface between the upper part radial bearing part and the side faced in the upper part radial bearing part.