Patent ID: 6145633
Filing Date: 2000-11-14
Classification: B61H,F16D

Abstract:
An actuating device for machine elements subject to wear play, comprising:an adjusting device configured as an adjusting nut/spindle assembly adjustable so as to compensate for wear play, the adjusting nut/spindle assembly including a sleeve-type adjusting nut having a toothing;a piston-cylinder unit having an axially movable piston rod arranged therein, the piston rod being connected with the adjusting device;automatically actuatable actuating drive means for engaging the toothing of the adjusting nut and means for rotating the adjusting nut, the actuating drive means including a pressure-medium cylinder having a piston rod arranged therein so as to directly engage in the toothing;a brake piston arranged within the piston cylinder unit, the brake piston being connected to the piston rod so as to axially move the piston rod;sensor means for measuring axial position of the piston rod and providing a corresponding input signal;an electronic control unit in electrical communication with the sensor so as to receive the input signal, the electronic control unit generating an actuating signal as a function of the input signal, the actuating signal being transmitted to the actuating drive means so as to operate the actuating drive means to compensate for wear play;a locking pawl at a distance from the piston rod of the pressure-medium cylinder and engagable with the adjusting nut toothing so as to permit the adjusting nut to rotate in only one direction;spring-loaded pull-release means for disengaging the locking pawl from the adjusting nut toothing; anda spring and a stop arranged to hold the pressure medium cylinder piston rod in the region of the adjusting nut toothing, the pressure medium cylinder being rotatably mounted around a bearing so as to be swivelable away from the region of the adjusting nut toothing against force of the spring so as to enable resetting of the adjusting nut.