| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotator device capable of being used for supporting a shaft which rotates, rocks and turns a movable stage or the like, and suppressing decrease in accuracy of motion and increase jump in cost. SOLUTION: A spherical roller bearing 1 as a rotator device is provided with an inner ring 2, an outer ring 3, a ball 4 being a sphere and a cage 5. A support shaft 6 is fitted o the inner ring 2 at its inner periphery. An inner peripheral face 8 of the outer ring 3 is formed into a sectional circular arc. A width O of the outer ring 3 is made larger than a width I of the inner ring 2. The support shaft 6 protrudes from an end face 3a of the outer ring 3. A center of a curvature C of the inner peripheral face 8 of the outer ring 3 is located on an axis P and at a position bisecting the width O of the outer ring 3 or at a position close to the end face 3a from the bisecting position. Provided that an angle formed by the axis P of the outer ring 3 and the support shaft 6 isθ0, and that the radius of curvature of the inner peripheral face 8 of the outer ring 3 is r2, and that the diameter of the support shaft 6 is (d), a space B between the center of curvature C and the end face 3a satisfies B<=-tanθ0×r2+((tan2θ0+2)r22-(d/cosθ0)r2)1/2.
|
