| 摘要 |
<p>A hydraulic actuation system for an automated transmission system having a clutch which is engaged via a clutch slave cylinder 22 operated under pressure from the system. A main control valve 120 which selectively connects the clutch cylinder 22, via a clutch control valve 122, and second working chambers 119 of gear engagement actuators 114, 115 to an accumulator 275 or to a reservoir 278. The clutch control valve 122 connects or isolates the clutch cylinder 22 to or from the main control valve 120. First gear engagement valves 144, 146 have an open position in which the first working chambers 118 of gear engagement actuators 114, 115 are connected to the accumulator 275 and a closed position in which the chambers 118 are isolated from the accumulator 275. Second gear engagement valves 145, 147 have an open position in which the second working chambers 119 of gear engagement actuators 114, 115 are connected to the main control valve 120 and a closed position in which the chambers 119 are isolated from the main control valve 120. Simple open/closed gear engagement valves 144-147 replaces more complex spool valves, thereby reducing overall system costs.</p> |
