Clamping device for axially clamping of a tool, especially a disc

A device for axially clamping a disc-shaped tool on a flange of a driven spindle with a threaded end, said clamping device comprising a clamping nut;

• a clamping disc supported on said clamping nut for biasing the tool against the flange and connected with said clamping nut for joint rotation therewith and axial displacement relative thereto;
• supporting bodies arranged between said clamping nut and said clamping disc and each having a guide track;
• an actuating member located between said clamping nut and said clamping disc and defining guide track means and radial recesses opening into said guide track means;
• rolling bodies displaceable along guide paths defined by guide tracks of said supporting bodies and said guide track means for radially loading said supporting bodies;
• and an insert member supported between said clamping nut and said clamping disc and including a plurality of stops projecting into said guide paths, said actuating member pressing said rolling bodies against said stops upon rotation in a first direction corresponding to a clamping direction, and displacing said rolling bodies into associated radial recesses upon rotation in a second direction opposite to said first direction whereby said supporting bodies are relieved from radial loads;
• and means on said supporting bodies for applying clamping pressure to said clamping disc.