Abstract: A hydraulic engine bearing for motor vehicles has a fluid-filled working chamber (4) surrounded by a rubber-elastic circumferential wall (3). A compensating chamber (7) is provided which is in connection with the working chamber (4) via an overflow duct (6) in a baffle plate (5) between the working chamber (4) and the compensating chamber (7). Another compensating chamber (10) is connected to the working chamber (4) via a bypass duct (9). The additional compensating chamber (10) is formed from an elastic bellows (11), which is surrounded on its outside by a fixed wall (12) and wherein an intermediate space (13) is arranged between the bellows (11) and the wall (12). The intermediate space can be filled with a compressible medium, preferably air, and the medium can be emptied by means of a switching device, wherein the switching device is formed from at least one non-return valve (14) and at least one on-off valve (15).

Abstract: A hydraulic engine bearing for motor vehicles has a fluid-filled working chamber (4) surrounded by a rubber-elastic circumferential wall (3). A compensating chamber (7) is provided which is in connection with the working chamber (4) via an overflow duct (6) in a baffle plate (7) between the working chamber (4) and the compensating chamber (7). Another compensating chamber (10) is connected to the working chamber (4) via a bypass duct (9). The additional compensating chamber (10) is formed from an elastic bellows (11), which is surrounded on its outside by a fixed wall (12) and wherein an intermediate space (13) is arranged between the bellows (11) and the wall (12). The intermediate space can be filled with a compressible medium, preferably air, and the medium can be emptied by means of a switching device, wherein the switching device is formed from at least one non-return valve (14) and at least one on-off valve (15).

Abstract: A trough-type parabolic concentrator (1) for a solar thermal power plant comprises a reflector plate (3) bent in trough shape and a support structure (4) for supporting the reflector plate (3) and comprising a plurality of wooden segments (2) arranged in a row in the longitudinal direction of the trough. Each segment (2) is assembled from a plurality of wooden frames (5). Using wooden frames (5) as the basic element of the supporting structure (4) allows for a lightweight, simple and low-cost structure of the trough-type parabolic concentrator (1).