| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device capable of stably rotated in relation to a change of the temperature environment by preventing the adverse effect of the difference between the coefficients of thermal expansion of respective members for constituting a dynamic bearing to a sleeve. SOLUTION: In a bearing device in which a dynamic bearing is used for a radial bearing for supporting load in the radial direction of a rotary shaft 2, and a sleeve 5 made of a resin material is fitted and fixed to the rotary shaft 2 of the dynamic bearing, fitting protrusions 2d, 2e are formed on both upper and lower ends of the rotary shaft 2, the sleeve 5 is fitted and fixed between the fitting protrusions 2d, 2e, and a clearance part G is formed between the sleeve 5 and the rotary shaft 2. Thermal deformation of the sleeve 5 is absorbed by the clearance part G, and the inner peripheral surface 5a of the sleeve 5 and the outer peripheral surface 6a of the rotary shaft 6 are prevented from being brought in contact with each other caused by the temperature change. |
