Patent ID: 7784278

Claim:
Hydraulic drive, with a hydraulic cylinder, which is divided by a regulating piston into a first regulating-pressure chamber and a second regulating-pressure chamber, and with a closed hydraulic circuit, which comprises a first hydro-pump, which is connected by a first connection via a first operating line to the first regulating-pressure chamber and which is connected by a second connection via a second operating line to the second regulating-pressure chamber, and with an open hydraulic circuit, which comprises a second hydro-pump, which is connected by a third connection to the first regulating-pressure chamber, wherein a fourth connection of the second hydro-pump is connected to a hydraulic accumulator via a connecting line, wherein the hydraulic accumulator stores energy and the pressure medium is filled into the hydraulic accumulator exclusively by the second hydro-pump and is removed from the hydraulic accumulator exclusively by the second hydro-pump; and wherein an auxiliary pump, which is connected to the first operating line and to the second operating line for the supply of pressure medium, in provided an addition to the first hydro-pump and the second hydro-pump.