Pressure-medium cylinder for hydraulic actuation device for actuating motor vehicle clutch, has guide sleeve axially fixed at housing, and shifting together with seal arrangement for releasing transfer port when limiting pressure is high

摘要

The cylinder (10a) has a piston (18) adjustably arranged in a bush (16) that limits a variable pressure chamber (32), and a pressure relief valve provided with a primary seal arrangement (36). The primary seal arrangement is arranged at a housing (12), and seals the pressure chamber against a pressure-free area. A transfer port is formed between the pressure chamber and the pressure-free area, and a guide sleeve (14) is axially fixed at the housing, and shifts together with the primary seal arrangement for releasing the transfer port when limiting pressure is high.