| 摘要 |
PURPOSE:To provide a bearing device capable of high-speed rotation because there is no shift of the center of gravity in a mounted object or in a case of a rotor magnet even with a temperature change, and thus no occurrence of vibration. CONSTITUTION:In a bearing device in which a rotary member 20 is supported in a support member 10 through a bearing R having a dynamic pressure groove and a mounted object 50 and a case 63 of a rotor magnet are fixed on the rotary member 20, at least either one of the mounted object 50 and the case 63 is fixed onto the outer peripheral face of the rotary member 20 by press-in or shrinkage fit, so that there is no gap in the fixing surfaces. Accordingly, even when the rotary member 20 is heated due to its high-speed rotation, the center of gravity in the mounted object 50 or in the case 63 do not shift in respect to the rotational center of the rotary member 20 and hardly lose the balance. |
