Robert Boschgmbh

Thomas Gellner

Gottfried Hendrix

Michael Goldbach

Günther Landgraf

Stephan Becker

Bernd Siegler

A servohydraulic drive includes a hydrostatic displacement machine, an electric machine that is mechanically speed-coupled with the displacement machine, a hydraulic cylinder that is fluidically connected to the displacement machine via first and second working lines, a hydraulic accumulator, and a supply unit. The displacement machine has a stroke that is adjustable via a hydraulic adjustment device. The cylinder is configured to be activated by reversal of the fluid flow through the displacement machine in opposite directions. The accumulator is preset to a low pressure and is fluidically connected via a valve assembly in each case to the lower pressure working line. The supply unit is configured to supply the adjustment device with pressurized fluid under the necessary pressure for the adjustment regardless of the present pressure in the working lines such that the displacement machine is configured for an active and load pressure-independent adjustment of its stroke volume.

Servohydraulic drive

A hydraulic assembly has a pressure medium container which at least partially encloses an electric motor, and a hydraulic pump which is driven by the electric motor using a simple, compact, and quiet design in a manner such that the electric motor is situated in the pressure medium container and is cooled by pressure medium without using the electric motor fan, in that the pressure medium container includes a partition which subdivides a pressure medium container interior at least partially into an intake region and a return region, and which maintains a certain level of pressure medium in the return region, and the electric motor is located in the return region of the pressure medium container.

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Steinfeld, Germany

Thomas Gellner