| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of erroneous alignment. SOLUTION: An outer ring 3b is provided with a part having a difference in level 7 at one end part of an outer diameter surface. The part 7 is constituted of a vertical wall 7a whose squareness to an axial line X is controlled with required accuracy and an outside diameter wall 7b which is in parallel with the axial line X and also whose outside diameter is controlled with the required accuracy. The outer ring 3b is attached to an attaching frame 2 in a state where the outside diameter wall 7b of the part 7 is fitted in the inner periphery 2a of the attaching frame 2 and the vertical wall 7a abuts on the end surface 2b of the attaching frame 2. A rolling body 3c may be formed of a ceramic material. |
