| 摘要 |
The invention relates to an assembly (31) for actuating a double-acting shift cylinder (32) of a shift assembly (18) of an automatic transmission (19) of a motor vehicle, comprising a hydraulic fluid reservoir (33) having a motor-driven hydraulic pump (35) and two control valves (37, 38) that are each connected to a pressure supply line (36) of the hydraulic pump (35) and to a return line to the hydraulic fluid reservoir (33), wherein the shift cylinder (32) has two pressure chambers (40, 41) that are each connected to one control valve (37; 38), wherein the control valves (37, 38) each connect one pressure chamber (40; 41) of the shift cylinder (32) to the pressure supply line (36) of the hydraulic pump (35) or to the return line (39) to the hydraulic fluid reservoir (33), wherein the assembly (31) contains at least one pressure-limiting valve that connects the pressure supply line (36) to the return line (39) if a hydraulic over-pressure is present. According to the invention, in order to improve the assembly, the control valves (37, 38) are each designed as 3/2-directional valves (47, 48) having integrated pressure-limiting valves. |
