| 摘要 |
A clamp sleeve for an indexing device is provided, the clamp sleeve being capable of providing a desirable clamping force without greatly increasing a fluid pressure, and having a long life. A clamp sleeve 34a has a through hole 34a7 and an annular groove 34a1 continuously provided around an outer periphery of the clamp sleeve 34a and defining a part of a pressure chamber 34d. The annular groove 34a1 includes a pair of inner end surfaces 34e6, 34e6', a groove bottom surface 34e0 extending in parallel to the through hole 34a7, and arcuate first transition surfaces 34e1, 34e1' provided between the inner end surfaces 34e6, 34e6' and the groove bottom surface 34e0. The annular groove 34a1 is provided such that a thickness t1 in a region provided with the groove bottom surface 34e0 is a thickness to allow the region to be deformable. A second transition surface 34e2, 34e2' is provided between at least one of the first transition surfaces 34e1, 34e1' and the groove bottom surface 34e0, the second transition surface 34e2, 34e2' having a further reduced curvature than a curvature of the first transition surfaces.
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