Actuating device for the actuation, in particular pneumatic actuation, of a friction clutch
AssigneeMannesmann Sachs AG
InventorAndreas Konrad
Life of this patent
Estimating the term…
Abstract
An actuating device for a friction clutch arranged in the drive train of a motor vehicle. The actuating device has a positioning servo arrangement with a pressure-medium power cylinder arrangement which acts on a disengagement bearing arrangement. There is provision, for assigning to a pressure-medium subsystem, made up of the pressure-medium power cylinder arrangement and a control valve of the positioning servo arrangement, a pressure compensating orifice which, at least when the positioning servo arrangement is in a holding state, permits a defined pressure-medium pressure compensating flow, in order to influence at least one positioning behavior of the positioning servo arrangement.
Claims47
An actuating device for a friction clutch arranged in a drive train of a motor vehicle, between an internal combustion engine and a gear unit, said actuating device comprising
- a disengagement bearing arrangement for actuating the friction clutch;
- a positioning servo arrangement having a pressure-medium power cylinder arrangement operatively arranged to act on the disengagement bearing arrangement;
- a pressure-medium source;
- a control valve connected to the pressure-medium source and the pressure-medium power cylinder arrangement so as to actuate the pressure medium power cylinder arrangement as a function of a command quantity representing a desired position and of an actual quantity representing a position of the disengagement bearing arrangement, the control valve comprising a valve arrangement adjustable between a first control state (I) connecting the pressure-medium power cylinder arrangement to the pressure-medium source and a second control state (II) connecting the pressure-medium power cylinder arrangement to a first pressure compensating orifice, the valve arrangement being changeable between the two control states (I, II) as a function of the actual quantity and of the command quantity;
- and
- a pressure-medium subsystem comprising the pressure-medium power cylinder arrangement, the control valve and a second pressure compensating orifice which, at least when the positioning servo arrangement is in a holding state, permits a defined second pressure-medium pressure compensating flow smaller than a first pressure-medium pressure compensating flow permitted by the first pressure compensating orifice in the second control state (II), in order to influence at least one positioning behavior of the positioning servo arrangement.
An actuating and/or positioning device, comprising:
- a servo arrangement with a pressure-medium power cylinder arrangement which acts on at least one element to be actuated and/or to be positioned;
- a pressure medium source;
- a control valve connected to the pressure-medium source and the pressure-medium power cylinder arrangement so as to actuate the pressure-medium power cylinder arrangement as a function of a command quantity representing one of a desired position and a desired actuating state and of an actual quantity representing one of an actual position and an actual actuating state of the element, the control valve comprising a valve arrangement adjustable between a first control state (I) connecting the pressure-medium power cylinder arrangement to the pressure-medium source and a second control state (II) connecting the pressure-medium power cylinder arrangement to a first pressure compensating orifice, the valve arrangement being changeable between the two control states (I, II) as a function of the actual quantity and of the command quantity;
- and a pressure-medium subsystem comprising the pressure-medium power cylinder arrangement, the control valve and a second pressure compensating orifice which, at least when the servo arrangement is in a holding state, permits a defined second pressure-medium pressure compensating flow smaller than a first pressure-medium pressure compensating flow permitted by the first pressure compensating orifice in the second control state (II), in order to influence at least one of positioning and actuating behavior of the servo arrangement.
Dependencies are inferred from the claim text.