Hydraulic drive and method for discreetly changing the positional output of said drive

Abstract

The invention relates to a hydraulic drive (1, 100) and a method for discreetly changing a positional output (3), in particular the linear and / or angular output, on a hydraulic drive (1, 100). At least one displacement cylinder (6, 7) either incrementally supplies or discharges the displacement cylinder volume (8, 9) to or from the drive (1, 100) by displacing the cylinder piston element (10, 11) from a starting position (12, 13) into an end position (14, 15) depending on at least one input signal (4, 5), wherein the piston element (10, 11) of the displacement cylinder (6, 7) is displaced from the starting position into the end position (12, 14 or 13, 15) and back from said end position (14, 15) multiple times in order to discreetly change the positional output (3) on the drive (1, 100) in a manner corresponding to the supplied or discharged displacement volume (8, 9). The displacement cylinder (6, 7) is hydraulically connected to a supply or return line (20, 21) of a pressure medium source (22) while displacing the piston element (10, 11) from the starting position into the end position (12, 14 or 13, 15), and the changed positional output (3) on the drive (1, 100) is restored in a successive step. The aim of the invention is to provide a stationary and inexpensive hydraulic drive (1, 100) which is guided in the linear output in an exceedingly precise manner. This is achieved in that the cylinder chambers of the displacement cylinder (6, 7) are hydraulically short-circuited by a short-circuit line (30, 31), which is hydraulically separated from the supply or return line (20, 21) of the pressure medium source (22), when returning the piston element (10, 11) from the end position into the starting position (14, 12 or 15, 13).

Description

technical field [0001] The invention relates to a hydraulic drive and a method for discontinuously varying the position output, in particular its stroke output and / or angular output, on a hydraulic drive, in which method, dependent on at least one input signal, at least one positive displacement cylinder The drive is incrementally supplied with its displacement by moving its piston element from the initial position to the final position, or the displacement is incrementally removed from the drive, wherein the piston element of the positive displacement cylinder is repeatedly The initial displacement to the final position and back from the final position in order to discontinuously change the position output on the drive according to the displacement delivered or discharged, wherein, after the piston element is displaced from the initial position to In the final position, the positive displacement cylinder is hydraulically connected to the supply or return line of the pressure...

AI Technical Summary

Problems solved by technology

The disadvantage is that a relatively large number of positive displacement cylinders is required for such actuating drives, which increases the structural complexity and thus costs of such actuating drives, especially if a high resolution of the stroke output is required

In addition, due to the large number of positive displacement cylinders, the probability of failure increases, which in turn affects the stability of the servo drive

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