Piston-cylinder assembly of a hydraulic press

A piston-cylinder assembly of a hydraulic press, which comprises a basic cylinder and a first and second piston, in which a ring cylinder has been formed above the basic cylinder as a continuation of the cylinder structure, the first piston is located inside the basic cylinder in the bottom part of the basic cylinder and the second piston is located above the first piston in the top part of the cylinder structure, the piston-cylinder assembly has a first hydraulic fluid space below the first piston and a second hydraulic fluid space below the second piston and the piston-cylinder assembly comprises a unified hydraulic fluid channel in flow connection to the first hydraulic fluid space in order to provide a pressure effect in the first piston and to the second hydraulic fluid space in order to provide a pressure effect in the second piston, which cylinder structure of the piston-cylinder assembly comprises a ring cylinder assembly, wherein the ring cylinder assembly comprises the ring cylinder, a spacer ring, which is below the ring cylinder, and a collar ring, that the ring cylinder is via the collar ring, which is one piece with the ring cylinder, connected to the spacer ring into the same one piece, whereby the ring cylinder assembly is formed unified.