Patent ID: 8449233
Filing Date: 2013-05-28
Classification: B23B,B23Q,Y10T

Abstract:
1. A clamp sleeve arranged between a rotary shaft and a frame outside the rotary shaft and having a through hole and an annular groove, the annular groove continuously provided around an outer periphery of the clamp sleeve and defining a part of a pressure chamber to which pressure fluid is supplied, wherein the annular groove includes a pair of facing inner end surfaces extending in a radial direction with respect to an axis line and separated from each other, a groove bottom surface extending in parallel to the through hole, and arcuate first transition surfaces provided between the inner end surfaces and the groove bottom surface, wherein the annular groove is provided such that a thickness in a region provided with the groove bottom surface is a thickness to allow the region to be deformable when the pressure fluid is supplied to the pressure chamber, and wherein a second transition surface is provided at a side proximate to at least one of the two inner end surfaces, at a position between the first transition surface and the groove bottom surface, the second transition surface having a further reduced curvature than a curvature of the first transition surfaces.