| 摘要 |
A longitudinally adjustable connecting rod (1) comprises a first rod part (4) and a second rod part (5), wherein the rod parts (4, 5) are movable telescopically relative to and/or into each other by means of a longitudinal adjustment mechanism (60), and said longitudinal adjustment mechanism (60) can be supplied with a hydraulic medium by means of a hydraulic conduit (11, 12). Said hydraulic conduit (11, 12) can be fluidically connected to a hydraulic medium supply conduit (13) by means of a control device (16). Said control device (16) has a first and a second valve (17; 22) with respective valve chambers (18; 23) and with one valve body (20, 25) each that can be forced against a valve seat (21; 26) by a restoring force. The valve chamber (18) of the first valve (17) is fluidically connected to a first hydraulic conduit (11) and the second valve chamber (23) of the second valve (22) to a second hydraulic conduit (12). The valve bodies (20; 25) can be operatively connected to each other by means of a connecting device (27) that can be moved between a first position and a second position. In the first position, the first valve body (20) and in the second position, the second valve body (25) can be lifted from the associated valve seat (21; 26) counter to the restoring force, and the first or second valve chamber (18; 23) can be fluidically connected to the hydraulic medium supply conduit (13). In the respective other position of the connecting device (27), the first valve body (20) rests on the first valve seat (21) or the second valve body (25) on the second valve seat (26), and blocks the fluid connection to the hydraulic medium supply conduit (13). |
