| 摘要 |
The hydraulic systems (40,40') have clutch hydraulic cylinders (44,84) that are connected with pump port (52) of electric motor-driven pumps (46,86) to actuate the friction clutches (76,78). The valve assemblies (70,90) establish direct link (54) between pump port and clutch hydraulic cylinders in first valve position. A clutch assembly (30) establishes direct link (72) between switching hydraulic cylinder (58) and pump port in second valve position so that the clutch assembly is actuated by varying the rotation speed of pump in a switching direction (64). An independent claim is included for a motor vehicle drive train. |
