| 摘要 |
The invention proposes a tool holder (1), in particular of the shrink-fit chuck type, the receiving section (5) of which comprises clamping means (9) which are provided centrally with respect to an axis of rotation (7) of the tool holder (1) for holding a shank (15) of a rotary tool, and which define a receiving opening (13) for the shank (15). The clamping means (9) can be displaced in the radial direction between a radially widened release position for insertion or removal of the shank (15) and a clamping position, in which the clamping means (9) exert radial press-fit forces, which hold the shank (15) in a frictional lock on its cylindrical outer circumferential surface (19), on the shank (15). The clamping means (9) are assigned a clamping surface (17) with a cylindrical contour which, in the clamping position, bears against the outer circumferential surface (19) of the shank (15) with surface-to-surface contact. The region of the tool holder (1) which forms the clamping surface (17) has a helical groove surrounding the axis of rotation (7) or a multiplicity of annular grooves (21) surrounding the axis of rotation (7) and at an axial distance from one another, which—as seen in the direction of the axis of rotation (7)—between adjacent turns of the helical groove or between adjacent annular grooves (21) form supporting regions (25), which are integrally connected to one another, are arranged at an axial distance from one another, project towards the axis of rotation (7) and the roof surfaces (27) of which, located towards the axis of rotation (7), form the cylindrical clamping surface (17).
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