Hydraulic actuation device for folding top unit of cabriolet vehicle, has piston-cylinder arrangement serving for discharging pressure of operating spaces during normal and emergency operating conditions

摘要

The actuation device (1) has a slide valve device (PSV1) operatively connected with a hydraulic connector (10) of a piston-cylinder arrangement (13) by a control line (21A) such that the valve device connects the control line with a pressure relief chamber (6) during pressure application condition and disconnects the line from the chamber during pressure discharge condition. Another piston-cylinder arrangement (14) serves for discharging pressure of operating spaces (14AK, 14BK, 15AK, 15BK) during normal operating condition and emergency operating condition.