Patent ID: 7350454

Claim:
A cylinder unit for mounting on a cross member and/or a table of a device or machine for deforming workpieces, the cylinder unit comprising a cylinder block adapted to be attached to the cross member and/or the table, a pressure plate mounted on a surface of the cylinder block facing away from a mounting surface, a plurality of pistons having spherically shaped heads mounted in the cylinder block for acting on the pressure plate, guide bolts mounted in the pressure plate, wherein the guide bolts protrude into the cylinder block and are guided in the cylinder block, a pressure piece mounted on the spherically shaped head of each piston, wherein the pressure piece protrudes into a bore of the pressure plate and has a recess which corresponds to the spherically shaped head, wherein a gap is provided between an outer diameter of the pressure piece and an inner diameter of the bore in the pressure plate, a pressure disc arranged in a bottom of the bore in the pressure plate between the pressure piece and the pressure plate, each pressure piece having a coaxial guide pin projecting beyond the pressure piece in a direction toward the piston, wherein the guide pin protrudes into a coaxial bore in the spherically shaped head of the piston, an elastic guide sleeve mounted in the coaxial bore between the guide pin and the coaxial bore, and an additional elastic guide sleeve mounted between each guide bolt and an additional bore in the pressure plate for the guide bolt, wherein the additional elastic guide sleeve is mounted in the additional bore.