| 摘要 |
Two angular contact ball bearings (5, 7) are arranged in a backside combination manner for supporting a machine tool spindle (3), a spindle head body (1) serves as a bearing case for holding the angular bearings, an inner collar (9) is disposed between inner races (5i, 7i) of the angular bearings, an outer collar (13) is disposed between outer races (5o, 7o) of the angular bearings, the outer collar is set to be longer in an axial direction than the inner collar to provide preloads to the angular bearings, the outer collar is made of a material having a smaller thermal expansion coefficient than the bearing case, the machine tool spindle and the inner collar.
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