| 摘要 |
<p>The invention relates to a pressure medium-actuated control device (1.1, 1.2, 1.3, 1.4) of an automated step-by-step variable speed transmission, comprising a selectable clutch control valve (3, 3.1, 3.2) for controlling a clutch control cylinder (2, 2.1, 2.2) of an actively closable separating clutch disposed in a power flux between a drive motor and an input shaft of the step-by-step variable speed transmission, and further comprising a self-retaining valve (5) disposed in the pressure supply branch of the clutch control valve (3, 3.1,3.2) for the rotational speed-dependent emergency actuation of the separating clutch. In order to expand the functional range, particularly in order to enable a safe engagement of gears in idle at an early stage, an electrically selectable switch-off actuator (8) is provided, which is configured, and is operatively connected to the self-retaining valve (5), such that the valve piston (42) of the self-retaining valve (5) can be moved into an idle position locking the pressure supply of the clutch control valve (3, 3.1, 3.2) in the powered state of the switch-off actuator (8), and into an operating position determined by the applied control pressures in the powered-off state of the switch-off actuator (8). ® KIPO & WIPO 2009</p> |
