Clamping device and machining unit comprising such a clamping device

A clamping device for clamping a tool holding fixture to a machine part of a machine tool, the clamping device comprising:

• a tension rod slidably mounted within the machine part;
• a clamping set that can be moved by the tension rod between a clamped position and a released position;
• a tension spring dedicated to the tension rod for generating the pull-in force of the clamping set and
• a release mechanism, by which the clamping set can be moved into the released position against the force of the tension spring by the tension rod,
• wherein the tension spring is clamped between a first rod part and a second rod part of the tension rod, which second rod part can move relative to the first rod part,
• as the clamping set moves into the released position, the tension spring is compressed on both ends by the release mechanism by the oppositely directed movement of the first and second rod parts,
• the release mechanism comprises an enclosure for moving the second rod part, which enclosure is slidably mounted within a stationary receiving fixture, and a pressure piston for moving the first rod part, which pressure piston is slidably guided within a pressure chamber of the enclosure and can be moved by a pressure medium,
• a tension sleeve is disposed on the rearward end of the second rod part, which tension sleeve is connected by a connecting piece to the enclosure of the release mechanism, and
• the connecting piece comprises a plurality of caliper-type connecting elements which are spaced apart from each other in the circumferential direction and the front and rearward lugs of which extend over a collar on the tension sleeve and over a collar on an enclosure section of the enclosure.

A clamping device for clamping a tool holding fixture to a machine part of a machine tool, the clamping device comprising:

• a tension rod slidably mounted within the machine part;
• a clamping set that can be moved by the tension rod between a clamped position and a released position;
• a tension spring dedicated to the tension rod for generating the pull-in force of the clamping set;
• and
• a release mechanism, by which the clamping set can be moved into the released position against the force of the tension spring by the tension rod,
• wherein the tension spring is clamped between a first rod part and a second rod part of the tension rod, which second rod part can move relative to the first rod part,
• as the clamping set moves into the released position, the tension spring is compressed on both ends by the release mechanism by the oppositely directed movement of the first and second rod parts,
• the release mechanism comprises an enclosure for moving the second rod part, which enclosure is slidably mounted within a stationary receiving fixture, and a pressure piston for moving the first rod part, which pressure piston is slidably guided within a pressure chamber of the enclosure and can be moved by a pressure medium,
• a tension sleeve is disposed on the rearward end of the second rod part, which tension sleeve is connected by a connecting piece to the enclosure of the release mechanism,
• a rearward end of the first rod part is axially slidably mounted in the tension sleeve, which rearward end has an enlarged diameter, and
• the rearward end of the first rod part is connected to a thrust ring by a plurality of pins that are axially slidably guided in the tension sleeve.