| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device reducing wear amount during use. <P>SOLUTION: Outer diameter dimension d and effective bearing span Y are determined to set a value P/(d×Y) dividing total weight P of a rotary member by a product of multiplication (d×Y) of the outer diameter dimension d of a shaft part an the effective bearing span Y of the radial bearing part to 0.02-0.12. Also, dimensions of each dynamic pressure groove A1, A2 and hill parts A3, A4 are determined to set ratio Wd/Wg of circumference direction width Wg of the dynamic pressure grooves A1, A2 and circumference direction width Wd of the hill parts A3, A4 in a dynamic pressure generating part A to 1-2. In same manner for a dynamic pressure generating part B, dimensions of each dynamic pressure groove B1, B2 and hill parts B3, B4 are determined to set ratio Wd/Wg to 1-2. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
