| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic pressure fluid bearing capable of stabilizing dynamic pressure and raising pressure. SOLUTION: With a groove slightly tilted in the rotating shaft direction, namely, in the tilted groove formed spirally, a width dimension of the groove along the rotating direction is different in an end side from another end side of the rotating shaft direction side. The groove dimension b of the end side 12 is set smaller, while the groove dimension c of the other end side 13 is set larger. The dynamic pressure generating force is expressed in F2c. In this instance, the groove width is gradually changing slightly from the other end side 13 to the end side 12, and accordingly, the groove cross sectional area in a component force F2c direction becomes smaller gradually. Then, the dynamic pressure generated from the component force F2c is increased in the groove end portion, namely, toward the one end side 12 and the slope grows steeper than the conventional groove structure. This phenomenon can be shown by Reynolds equation in hydrodynamics. COPYRIGHT: (C)2006,JPO&NCIPI
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