Patent ID: 6358185
Filing Date: 2002-03-19
Classification: F16H,Y10T

Abstract:
Gear-changing appliance of a gearbox having a frictional connection whose engagement makes an associated gearbox transmission ratio effective, comprising a hydraulic fluid actuator for actuating the frictional connection, and a pressure regulating valve configured to adjust a required working pressure of the hydraulic actuator and whose supply pressure is adjusted by an associated pressure regulating valve in accordance with a load-dependent control signal, wherein a control pressure derived from the working pressure is used for a load-dependent control signal, wherein the pressure regulating valve for the supply pressure (pV) is connected, via a priority control arrangement (17 or 18) operating as a pressure balance, to control pressure lines carrying a control pressure respectively, derived from relevant working pressure (pA) of at least two actuators for respectively actuating a frictional connection associated with a certain gearbox transmission ratio, and a regulating piston of the associated pressure regulating valve for the supply pressure and a priority control piston are arranged in tandem in and relative to a valve chamber and axially displaceable relative to one another, and enclose a first control pressure chamber therebetween, an end face, facing away from the regulating piston of the priority control piston closes off a second control pressure chamber in the valve chamber both control pressure chambers are respectively connected to a control pressure line operatively associated with frictional connections, and the priority control piston is rigidly supportable relative to the regulating piston in a direction pointing toward the regulating piston.