Liebherr-Mining Equipment Colmar Sas

Philipp Hahn

Volker Gliniorz

Guillaume Bonnetot

Alexis Leroy

The present invention relates to a mobile work machine, in particular a hydraulic excavator, which comprises an engine for driving the mobile work machine, a hydraulic power generation unit which is coupled to the engine and is designed to convey a hydraulic volume in a manner which is dependent on a rotational speed of the engine, and a plurality of hydraulic elements which can be actuated by way of the conveyed volume of the hydraulic power generation unit and are assigned to various functions of the mobile work machine. The machine is characterized by a control unit for detecting a defined operating mode of the mobile work machine, wherein the control unit is designed to set the setpoint rotational speed of the engine in a manner which is dependent on the detected defined operating mode.

Mobile work machine and method for operating a machine of this type

An apparatus for recuperating hydraulic energy in a working machine includes at least one first differential cylinder piston device with a differential cylinder and separate rod and bottom sides, and at least one hydraulic accumulator which is hydraulically connectable with the differential cylinder piston device. The potential energy of the differential cylinder piston device retracting under pressing load is at least partly storable in the hydraulic accumulator. The rod and bottom sides are connectable with each other via at least one brake valve for recirculating hydraulic fluid from the bottom side into the rod side.

Apparatus for recuperating hydraulic energy with energy-efficient replenishment of the rod sides of differential cylinders and simultaneous pressure intensification

The invention concerns a device for the direct recovery of hydraulic energy in a machine, comprising at least one single-acting storage cylinder-piston device with a storage cylinder, a storage cylinder-piston and a storage cylinder chamber, with at least one differential cylinder-piston device with a differential cylinder comprising a separate rod side and base side, and with at least one hydraulic accumulator, which may be connected to the storage cylinder-piston device and/or the differential cylinder-piston device, wherein the potential energy of the storage cylinder-piston device, which retracts under a compressive load, may be at least partially stored in the hydraulic accumulator.

Device for the direct recovery of hydraulic energy by means of a single-acting hydraulic cylinder

Device for recovering hydraulic energy in a machine comprising at least a first differential cylinder-piston assembly having a differential cylinder with a separate rod and base side, at least a second differential cylinder-piston assembly having a differential cylinder with a separate rod and base side, and at least one hydraulic accumulator that can be hydraulically connected to at least one of the differential cylinder-piston assemblies, wherein the differential cylinder-piston assemblies are mechanically coupled to one another, and wherein the potential energy of at least one of the differential cylinder-piston assemblies retracting under a compressive load can at least partially be stored in the hydraulic accumulator.

Device for recovering hydraulic energy by connecting two differential cylinders

This invention relates to a device for the recuperation of hydraulic energy in a working machine with at least one differential cylinder and to a corresponding working machine.

Device for recuperation of hydraulic energy and working machine with corresponding device

The invention relates to an apparatus for the energy-optimized hydraulic control of at least one double-action working cylinder of a work machine comprising a hydraulic pressure transducer which is hydraulically connected to a first piston surface of the working cylinder, to a second piston surface of the working cylinder and to at least one pressure accumulator, wherein the pressure transducer is configured such that the hydraulic energy of a high-pressure volume flow conveyed by the first piston surface to the pressure transducer can be stored completely or at least partially by the at least one connected pressure accumulator and such that the cylinder chamber of the second piston surface of the working cylinder can be filled with a low-pressure volume flow by the pressure transducer.

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Turckheim, France

Philipp Hahn