Bore clamp

A bore clamp for clamping a workpiece comprising a workpiece bore located in the workpiece, with

• a) a clamping bush for engaging in the workpiece bore, the clamping bush being radially expandable,
• b) a clamping bolt which extends coaxially through the clamping bush and is axially displaceable in a clamping direction between a clamping position and an unclamping position,
• b1) where the clamping bolt radially expands the clamping bush in the clamping position in order to clamp the clamping bush in the workpiece bore,
• b2) whereas the clamping bolt does not radially expand the clamping bush in the unclamping position so that the clamping bush can be inserted into the workpiece bore or pulled out of the workpiece bore, and
• c) a clamping bolt drive for axial displacement of the clamping bolt in the clamping direction into the clamping position, said clamping bolt drive comprises the following:
• c1) a piston laterally displaceable with respect to the clamping direction, and
• c2) a wedge gear with wedge faces sliding on one another for converting the lateral movement of the piston into a corresponding axial movement of the clamping bolt in the clamping direction.,
• c3) a tension bolt which is displaced in the clamping direction by the wedge gear in a cylinder, and
• c4) an anti-rotation device which prevents rotation of the clamping bolt relative to the tension bolt during operation.

A bore clamp for clamping a workpiece comprising a workpiece bore located in the workpiece, with

• a) a clamping bush for engaging in the workpiece bore, the clamping bush being radially expandable,
• b) a clamping bolt which extends coaxially through the clamping bush and is axially displaceable in a clamping direction between a clamping position and an unclamping position,
• b1) where the clamping bolt radially expands the clamping bush in the clamping position in order to clamp the clamping bush in the workpiece bore,
• b2) whereas the clamping bolt does not radially expand the clamping bush in the unclamping position so that the clamping bush can be inserted into the workpiece bore or pulled out of the workpiece bore,
• c) a clamping bolt drive for axial displacement of the clamping bolt in the clamping direction into the clamping position, and
• d) a reset device for resetting the radial expansion of the clamping bush in the clamping position into a radially contracted position of the clamping bush in the unclamping position, wherein the reset device comprises:
• e) a circumferential wedge surface on the underside of the clamping bush,
• f) wedge ring on the underside of the clamping bush with a circumferential wedge surface on its upper side, the wedge surfaces of the wedge ring on the one hand and of the clamping bush on the other hand sliding on one another, and
• g) at least one axially extending plunger which, on the one hand, is connected to a tension bolt and, on the other hand, presses against the wedge ring, so that the wedge ring radially compresses the clamping bush in the unclamping position.

A bore clamp for clamping a workpiece comprising a workpiece bore located in the workpiece, with

• a) a clamping bush for engaging in the workpiece bore, the clamping bush being radially expandable, preferably with several separate clamping segments which are arranged distributed over the circumference of the clamping bush,
• b) a clamping bolt which extends coaxially through the clamping bush and is axially displaceable in a clamping direct between a clamping position and an unclamping position,
• b1) where the clamping bolt radially expands the clamping bush in the clamping position in order to clamp the clamping bush in the workpiece bore,
• b2) whereas the clamping bolt does not radially expand the clamping bus in the unclamping position so that the clamping bush can be inserted into the workpiece bore or pulled out of the workpiece bore,
• c) a clamping bolt drive for axial displacement of the clamping bolt in the clamping direction into the clamping position, and
• d) a reset device for resetting the radial expansion of the clamping bush in the clamping position into a radially contracted position of the clamping bush in the unclamping position wherein the reset device comprises:
• e) first grooves in a lateral surface of the clamping bolt, the first grooves extending in a longitudinal direction and each having an undercut, and
• f) second grooves in an inner surface of the clamping bush, the second grooves running in a longitudinal direction and each having an undercut,
• g) coupling elements which slide in the first grooves on the one hand and in the second grooves on the other hand, so that the coupling elements forcibly radially contract the clamping bush when the clamping bolt is moved from the clamping position to the unclamping position.