Control device for a hydraulically loaded working cylinder

The invention relates to a control device for a hydraulically loaded working cylinder, the stroke of which is controlled by a valve which is actuated via an operating member driven in a rotatable manner by a motor. The return of the stroke movement of the piston of the working cylinder is effected by a threaded spindle which is screwed to a threaded sleeve carrying the control member. The valve for controlling the pressure-medium paths to the working cylinder is designed as a spool valve, the valve housing of which is connected to one side of the control housing in which the threaded spindle, the threaded sleeve and the control member are accommodated. The motor is fastened at the end face to the control housing via a housing flange. In this way, three of four longitudinal sides of the control housing are free and can be cooled, as a result of which temperature-induced length changes of the threaded spindle through heat transfer from the valve housing are largely avoided. Furthermore, the control device has a compact type of construction in which the motor can be arranged above the housing flange alternatively next to one of the three free longitudinal sides of the control housing.