| 摘要 |
PURPOSE: A fluid dynamic pressure bearing is provided to prevent unnecessary loss and flying of oil by improving a bearing groove for maintaining stable lubricating force and improving abrasion resistance, thereby expanding a lifespan of a bearing. CONSTITUTION: A fluid dynamic pressure bearing(10) includes grooves(40) on an upper part and a lower part of an inner diameter surface(11) with a predetermined distance, wherein the grooves are machined in the shape of "U" at positions corresponding to an uppermost end part and a lowermost part of a dynamic pressure groove(21) of a rotation shaft(20) inserted into the inner diameter of the bearing, the sectional part of the inner diameter surface is rounded in the shape of arc, and a fine clearance(30) is formed between the inner diameter surface of the bearing and an outer diameter surface of the rotation shaft for flowing oil.
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