Patent ID: 8151563

Claim:
A hydraulic drive system for driving an apparatus ( 6 ), with a drive unit ( 10 ) which can drive the apparatus ( 6 ) via a primary hydraulic circuit comprising a first hydraulic displacement machine ( 1 ) and a second hydraulic displacement machine ( 2 ), and with a third hydraulic displacement machine ( 3 ) which is connectable or connected with the apparatus ( 6 ) for transmitting mechanical energy, and a high-pressure accumulator ( 5 ) which is hydraulically connected or connectable with the third displacement machine ( 3 ), wherein the high-pressure accumulator ( 5 ) can be charged by a hydraulic displacement machine which is connected or connectable with the drive unit ( 10 ) for transmitting mechanical energy, and the third hydraulic displacement machine ( 3 ) is connected or connectable to provide recovery of energy or support of the drive system independently from the primary hydraulic circuit.