Quick change system

A clamping device (1a) for clamping a work piece at a rotating spindle of a machine tool, wherein the clamping device comprises a base body (2), which is configured to be fixated at the spindle and which comprises at least one change body (1) which can be coupled to and decoupled from the base body (2), wherein the change body (1) and the base body (2) are supported coaxially relative to one another and clamped relative to one another in radial direction by roller elements (11), wherein each of the roller elements (11) is disposed in a gap between the base body (2) and the change body (1), which is configured as a wedge shaped gap and adapted to the respective roller element (11), so that the respective roller element can be moved along the wedge shaped gap, deeper into the wedge shaped gap, when the base body (2) and the change body (1) are connected to one another, so that the desired clamping is provided in radial direction;

• wherein the respective wedge shaped gap is also configured as a wedge shaped gap when viewed in circumferential direction, so that the tendency of the change body (1) to move in circumferential direction relative to the base body (2) causes a reinforcement of the radial clamping between the base body (2) and the change body (1),
• wherein the respective wedge shaped gap is configured, so that the roller element (11) also limits the relative movement between the base body (2) and the change body (1) in at least one circumferential direction,
• wherein the roller elements (11) are disposed in a bearing cage (22), which can be loaded with an external torque, so that the bearing cage (22) drives the roller elements (11) into the wedge shaped gap, and/or drives them out of the wedge shaped gap, and
• wherein the bearing cage (22) is configured, so that it interacts with a blocking mechanism, which retains it so that, while the base body (2) or the change body (1) continue to move with the spindle of the machine tool, the roller elements (11) are driven into the wedge gap or driven out of the wedge gap due to said rotation of the spindle and due to the retention of the bearing cage (22).

A clamping device (1a) for clamping a work piece at a rotating spindle of a machine tool, wherein the clamping device comprises a base body (2), which is configured to be fixated at the spindle and which comprises at least one change body (1) which can be coupled to and decoupled from the base body (2), wherein the change body (1) and the base body (2) are supported coaxially relative to one another and clamped relative to one another in radial direction by roller elements (11), wherein each of the roller elements (11) is disposed in a gap between the base body (2) and the change body (1), which is configured as a wedge shaped gap and adapted to the respective roller element (11), so that the respective roller element can be moved along the wedge shaped gap, deeper into the wedge shaped gap, when the base body (2) and the change body (1) are connected to one another, so that the desired clamping is provided in radial direction,

• wherein the respective wedge shaped gap is configured, so that the roller element (11) also limits the relative movement between the base body (2) and the change body (1) in at least one circumferential direction,
• wherein at least one of the two sections of the base body (2) and the change body (1), which form a gap between each other, which is a wedge shaped gap in the direction of the common axis, comprises a noncircular outer contour when viewed in circumferential direction, the noncircular outer contour being one of an oval, an ellipse, or a rounded triangle or rectangle or a three-sided or four-sided epitrochoid profile, and
• wherein both sections comprise a non-circular outer contour, so that viewed along a closed circumference line, a gap with substantially constant height is formed between the base body (2) and the change body (1) when they are inserted into one another.