DYNAMIC PRESSURE FLUID BEARING DEVICE

PROBLEM TO BE SOLVED: To provide a dynamic pressure fluid bearing device capable of increasing reliability by preventing lubricating fluids from being lost by leakage and deteriorated. SOLUTION: The meniscus 14 and 24 side end parts 15 and 25 of dynamic pressure grooves 11 and 21 are positioned on the meniscuses 14 and 24 sides more than the end parts 16 and 26 of the opposed surfaces thereof and face lubricating fluid sumps 17 and 27. Accordingly, the clearance dimension of a dynamic pressure generating part is 10 to 15 μm to prevent the pressure flow of lubricating fluids 13 and 23 from being sheared by the end parts 15 and 25 so as to prevent the lubricating fluids from being deteriorated. Also, since tensile stresses to the dynamic pressure generating part side acts on the meniscuses 14 and 24 by the drawing action to the dynamic pressure generating parts of the lubricating oil fluids 13 and 23 in the lubricating fluid sumps 17 and 27 by the dynamic pressure grooves 11 and 21, the lubricating fluids 13 and 23 can be prevented from leaking to the outside of the meniscuses 14 and 24. COPYRIGHT: (C)2006,JPO&NCIPI