Patent ID: 9121419
Filing Date: 2015-09-01
Classification: F15B

Abstract:
1. A hydraulic drive device comprising: a piston displaceably guided in a cylinder chamber along a working axis and defining a working pressure chamber which may be pressurized by a hydraulic fluid; a control means guided in the piston at least partially between various control states, and configured to control the throughflow of the hydraulic fluid from a high pressure supply into the working pressure chamber to move the piston in a working direction, and from the working pressure chamber to a return flow chamber, wherein the control means, in the region in which it is guided in the piston, defines a pressure chamber in the working direction, said pressure chamber being connected in a pressurized manner to a low pressure chamber, wherein a region of the piston remote from the working pressure chamber defines the low pressure chamber which, during operation of the device, is pressurized by a low pressure supply of hydraulic fluid, such that the piston is moved back counter to the working direction when the control means connects the working pressure chamber to the return flow chamber, and adjustment means for adjusting a pressure of the high pressure supply according to a travelling distance in the working direction of the piston and/or a working load of the piston.