Piston-cylinder assembly of a hydraulic press

A piston-cylinder assembly of a hydraulic press, the piston-cylinder assembly comprising:

• a basic cylinder,
• a first piston,
• a second piston,
• a ring cylinder positioned on top of the basic cylinder as a continuation of the basic cylinder to form a cylinder structure, the first piston is located inside the basic cylinder in a bottom part of the basic cylinder and the second piston is located within the ring cylinder and above the first piston in a 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
• 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,
• wherein the top part of the cylinder structure of the piston-cylinder assembly comprises a ring cylinder assembly, wherein the ring cylinder assembly comprises the ring cylinder, a spacer ring positioned 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 in one piece that includes the ring cylinder, the spacer ring, and the collar ring.