Electrohydraulic press drive system
AssigneeOsrodek Badawczo-Rozwojowy Przemyslu Budowy Urzaszen Chemicznych "Cebea"
InventorsAndrzej Kosek, Adam Grudzewski
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Abstract
An electrohydraulic press drive system comprising a pressure transformer h variable ratio of displacement volume connected in series in a drive hydraulic circuit between a gas-hydraulic accumulator and a press cylinder. The pressure transformer consists of a hydraulic motor, which is connected mechanically with a hydraulic pump, the source of drive power of the pressure transformer being the gas-hydraulic accumulator.
Claims1
Electrohydraulic press apparatus comprising a hydraulic output cylinder, a hydraulic pump coupled to said cylinder to pressurize the same, a source of hydraulic fluid coupled to said pump, said cylinder, pump and source of fluid forming a first hydraulic circuit, a motor-driven pump coupled to said source, a gas-hydraulic accumulator connected to said motor-driven pump to be pressurized thereby, and a hydraulic motor connected to said hydraulic pump to drive the same, said hydraulic motor being coupled to said accumulator and to said source for discharge thereto to form a second hydraulic circuit separate from the first, said hydraulic motor being drivingly coupled to said motor-driven pump, at least one of said hydraulic pump and said hydraulic motor having variable displacement volume.
Dependencies are inferred from the claim text.