ACCUMULATOR-FREE HYDRAULIC DRIVE SYSTEM FOR A CONSUMER AND COMPRISING THE SAME, ESPECIALLY FOR HYDRAULIC PRESSES, AND METHOD FOR HYDRAULICALLY DRIVING A CONSUMER WITHOUT AN ACCUMULATOR

摘要

The accumulator-free hydraulic drive system (10) has two pressure chambers (K,R). The pump arrangement (20) consists of a main feed pump (P1) for working strokes and an auxiliary pump (P2) for back strokes. A controller (6) is provided for controlling or regulating the counter pressure in the pressure chamber assigned to the auxiliary pump. The counter pressure is established by the auxiliary pump and is active against the pressure in the working chamber of the consumer (1). An independent claim is included for a method for accumulator-free hydraulic driving of a consumer.