Clutch actuation system with auxiliary actuating assembly
First Claim
1. An actuation system for a friction clutch installed in the drive train of a motor vehicle, said actuation system comprising a pressure medium powered cylinder assembly for actuating the friction clutch, means for providing a control input representing a desired actuation state of said clutch, means for providing an actual value representing the actual actuation state of said clutch, a main pressure medium source, a pilot/automatic control valve assembly which supplies pressure medium to said pressure medium powered cylinder assembly from said main pressure medium source as a function of said control input and said actual value, a pilot/automatic control unit which operates said pilot/automatic control valve assembly, an auxiliary pressure medium source, and an auxiliary actuating valve assembly for actuating said clutch independently of said pilot/automatic control valve assembly, said pilot/automatic control unit, and an instantaneous pressure medium pressure of said main pressure medium source, wherein said auxiliary actuating valve assembly can be switched into a pressure medium feed position, wherein said pressure medium powered cylinder assembly can be connected to one of said main pressure medium source and said auxiliary pressure medium source, and into a pressure medium discharge position, wherein said pressure medium powered cylinder assembly can be connected to one of a pressure compensation port and a pressure compensation tank.
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Accused Products
Abstract
An actuation system for a friction clutch installed in the drive train of a motor vehicle between a drive unit and a transmission includes a pressure medium-powered cylinder assembly and a pilot/automatic control valve assembly. An auxiliary actuating assembly includes an auxiliary actuating valve assembly, which can be switched into a pressure medium feed position, wherein the pressure medium-powered cylinder assembly can be connected with the pressure medium source or with a separate auxiliary pressure medium source for emergency actuation of the clutch, and into a pressure medium discharge position, wherein the cylinder assembly can be connected with a pressure compensation port or with a pressure compensation tank.
46 Citations
30 Claims
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1. An actuation system for a friction clutch installed in the drive train of a motor vehicle, said actuation system comprising
a pressure medium powered cylinder assembly for actuating the friction clutch, means for providing a control input representing a desired actuation state of said clutch, means for providing an actual value representing the actual actuation state of said clutch, a main pressure medium source, a pilot/automatic control valve assembly which supplies pressure medium to said pressure medium powered cylinder assembly from said main pressure medium source as a function of said control input and said actual value, a pilot/automatic control unit which operates said pilot/automatic control valve assembly, an auxiliary pressure medium source, and an auxiliary actuating valve assembly for actuating said clutch independently of said pilot/automatic control valve assembly, said pilot/automatic control unit, and an instantaneous pressure medium pressure of said main pressure medium source, wherein said auxiliary actuating valve assembly can be switched into a pressure medium feed position, wherein said pressure medium powered cylinder assembly can be connected to one of said main pressure medium source and said auxiliary pressure medium source, and into a pressure medium discharge position, wherein said pressure medium powered cylinder assembly can be connected to one of a pressure compensation port and a pressure compensation tank.
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23. An actuation system for a friction clutch installed in the drive train of a motor vehicle, said actuation system comprising
a pressure medium powered cylinder assembly for actuating the friction clutch, means for providing a control input representing a desired actuation state of said clutch, means for providing an actual value representing the actual actuation state of said clutch, a main pressure medium source, a pilot/automatic control valve assembly which supplies pressure medium to said pressure medium powered cylinder assembly from said main pressure medium source as a function of said control input and said actual value, a pilot/automatic control unit which operates said pilot/automatic control valve assembly, an auxiliary pressure medium source comprising an auxiliary pressure medium tank, and a switching valve assembly which is switchable between an open position, wherein said pressure medium powered cylinder assembly is connected to said auxiliary pressure medium tank, and a blocking position, wherein the pressure medium powered cylinder assembly is isolated from said auxiliary pressure medium tank.
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26. An actuation system for a friction clutch installed in the drive train of a motor vehicle, said actuation system comprising
a pressure medium powered cylinder assembly for actuating the friction clutch, means for providing a control input representing a desired actuation state of said clutch, means for providing an actual value representing the actual actuation state of said clutch, a main pressure medium source, a pilot/automatic control valve assembly which supplies pressure medium to said pressure medium powered cylinder assembly from said main pressure medium source as a function of said control input and said actual value, a pilot/automatic control unit which operates said pilot/automatic control valve assembly, an auxiliary pressure medium source comprising an auxiliary pressure medium tank, and a switching valve assembly which is switchable between a position wherein said tank is connected to said pressure medium source, whereby said tank can be filled with pressure medium, a position wherein said tank is connected to said pressure medium powered cylinder, whereby said clutch can be actuated, and a position wherein said tank is isolated from said main pressure medium source and said pressure medium powered cylinder assembly, whereby said pressure medium is available in said tank for emergency use.
Specification