摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bearing device which can switch a preload continuously or stepwise according to necessity, and can favorably maintain the accuracy of the rotation of a bearing while enhancing the rigidity of a system as a whole without causing the axial elongation of a shaft, a rotating table of a machine tool having the bearing device, and a spindle device.SOLUTION: A bearing device comprises a pair of angular bearings 24 having a contact angleα, and a sleeve 30 which is fit to an external peripheral face 22a of an outer ring 22, and in which a pressure chamber 35 capable of supplying a pressure fluid is formed therein. An annular external peripheral groove 33 or an annular internal peripheral groove 34 of the pressure chamber 35 is formed so as to intersect with an extension line CL of the contact angleα.</p> |