Smw Schneider & Weisshaupt Gmbh

Heinz-dieter Schunk Gmbh. & Co., Spanntecknik Kg

Siegfried Gulde

Gerhard Michler

The invention relates to a clamping cylinder for operating, for instance, a chuck by means of a pull pipe or pull rod installed preferably in a turning machine. The clamping cylinder has a cylinder casing (,) comprising a screwed-on cover plate (,), an axially displaceable piston (,) in the work chamber (,) of the cylinder casing (,) to produce the clamping force and a distributor (,) fixed onto one of the cylinder casing faces with ports and pressure lines for supplying and discharging a pressure oil to and from the work chamber of the piston. According to the invention, the cylinder casing (,), its lid (,) and the distributor casing are made of a light metal in order to reduce inertia moments and wear and to improve lubrication and heat dissipation. The walls of the locating bores for the piston (,) and/or its piston rods (,) are hard coated. The piston and its two piston rods are made in a single piece from a tool steel and their respective contact surfaces are hard chrome coated. In order to maintain an even sealing gap (,), radial bores (,) are provided in the piston rod (,) located in the distributor casing (,), one of said radial bores additionally supplying the sealing gap with oil.

Clamping cylinder

A chuck with radially adjustable base jaws and exchangeable clamping jaws is provided. The toothings of the base jaws intermesh with respective toothings of the clamping jaws. The base jaws and the clamping jaws are coupled by respective keys which are adjustable relative to one another by an amount corresponding at least to the height of the intermeshing toothings. The adjustment is carried out by a clamp bolt which extends through the shaft of the key and which is provided with a conical clamping surface. The clamp bolt is supported at a rotatably mounted threaded elements or spindle such that the key may be adjusted in the axial direction of the key shaft by the rotation of the threaded element or spindle due to the cooperation of respective counter surfaces provided at the threaded element or spindle with the clamping surfaces of the clamp bolt. Due to this arrangement it is possible to connect and release respective clamping jaws from the base jaws in a very short period of time. Furthermore, an extremely high stability of the base jaws-clamping jaws-arrangement is achieved so that very high forces may be transmitted.

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Langenenslingen, Germany

Siegfried Gulde