| 摘要 |
The problem addressed by the invention is that of developing a hydrostatic control circuit (100), in particular as an auxiliary steering system in utility vehicles, comprising: a hydraulic pump (20), which has two connections (21, 22) and, in particular, can be reversed, of which connections each connection (21, 22) leads, via connecting lines (41 ,42, 51, 52), to one of two chambers (31, 32) of at least one hydraulic actuator (30) having a control element (34), wherein a check valve (25, 28) is arranged between each of the two connections (21, 22) and the chamber (31, 32) associated with the particular connection (21, 22) and wherein after the one activation of the hydraulic pump (20), a certain volumetric flow of hydraulic fluid is conducted from the one connection (21) acting as a pressure connection into the one chamber (31) via a first segment (41) of a first connecting line, the first check valve (25), and a second segment (51) of the first connecting line, the control element (34) thus being translated, and hydraulic fluid is displaced from the other chamber (32) to a tank (46) via a second segment (52) of a second connecting line, the second pressure valve (27), which is brought into a control position by the incoming volumetric flow, and a tank line (45), wherein the two chambers (31, 32) have substantially the same effective areas; in such a way that only very few components are required and the steering system can be brought into the center position in the event of a fault without having to supply energy to the system. This problem is solved, according to the invention, in that the two chambers (31, 32) are connected to a device (70), in particular by means of lines (61, 62), the components of which device can be put into a switching state as a result of the deflection of the hydraulic actuator (30) from the center position of the hydraulic actuator, which switching state enables unidirectional flow between the two chambers (31, 32) in such a way that a piston rod (36) of the hydraulic actuator (30) can be moved only toward the center position. |
