Device for reducing vibrations in a hydraulic actuating system, particularly hydraulic clutch actuating system for motor vehicles

A device for reducing vibrations in a hydraulic clutch actuating system, for motor vehicles, comprising;

• a housing in which a pressure chamber is formed;
• the pressure chamber being fluid-connectable by way of at least one connection with the hydraulic actuating system and being bounded by a resilient membrane which has a pressure-loadable surface facing the pressure chamber and a remote surface remote from the pressure chamber;
• the remote surface being provided with a profiling by way of which the membrane when loaded with pressure is capable of support on a fixed wall section of the housing;
• at least one web section at said remote surface with at least one web having a web foot distant from the wall section, a web end adjacent to the wall section and a defined web cross-section;
• and
• each web being formed asymmetrically with respect to a notional plane extending normal to the pressure-loadable surface of the membrane through the web foot and perpendicularly to the web cross-section so that each web when the membrane is subjected to predetermined pressure loading buckles in a predetermined direction without hindrance and with support of the web end on the wall section.