Patent ID: 6250435
Filing Date: 2001-06-26
Classification: F16D

Abstract:
An actuation device for operating a machine element exhibiting wear-induced play, comprising:an actuating piston-cylinder unit operative for generating an actuation force and having an actuating piston rod;a readjusting device comprising a hydraulic pressure space and a hydraulic readjusting piston-cylinder unit having an adjusting piston for communicating the actuation force in said actuating piston-cylinder unit to the machine element to be actuated, said adjusting piston being extendable for compensating for the wear-induced play;a sensor element operatively connected for detecting an amount of wear-induced play; anda valve element connected between said hydraulic pressure space and said readjusting piston-cylinder unit for admitting hydraulic medium into said readjusting piston-cylinder unit from said hydraulic pressure space via an operating pressure of said actuating piston-cylinder unit when said valve element is open for extending said adjusting piston, said valve element operatively connected to said sensor element for opening when the amount of wear-induced play exceeds a threshold limit.