| 摘要 |
PROBLEM TO BE SOLVED: To reduce a fluctuation and scattering/oozing-out of lubricant in low torque, and to prevent gas from coming out of an adhesive by arranging a shielding plate at least in one of the shaft directional outside of ball bearings. SOLUTION: Microscopic clearances 38 are held between seals 30 and inner races orbital surface 34 by arranging the seals 30 on outer races 10 on the shaft directional both sides of balls in bearings 2 and 4 and by arranging a pair of ball bearings 2 and 4 on both ends of a shaft 6 having both ends fixed to a case 100. An S-shaped passage is formed of the microscopic clearances 38 and clearances 26 since the microscopic clearances 26 are kept between an outer peripheral surface of a shielding plate 22 and an inner peripheral surface of a housing 8 when it is pressed in/fixed to the shaft 6 by arranging the stainless steel shielding plate 22 presenting a hollow disk shape on the shaft directional outside of the upper-lower ball bearings 2 and 4. Therefore, scattering/oozing-out of lubricating oil can be reduced, and pollution to a magnetic disk surface by gas coming out of an adhesive, can be prevented. |
