Liebherr-Werk Nenzing Gmbh

Fabian Weber

Mathias Blank

The disclosure relates to a work machine, comprising a primary energy source for feeding electric energy into a link, a gear for performing a task of the work machine, at least one electric drive connected to the link in order to operate the gear of the work machine, a holding brake for fixing or releasing the gear, and an energy store which is connected to the link in order to provide electric energy demanded from the link upon actuation of a gear and/or to absorb electric energy fed into the link. According to the disclosure, during an emergency lowering of the gear, the at least one electric drive to convert the kinetic energy into electric energy and to feed it into the link. In the event of an unavailability or failure, the primary energy source is configured to absorb the energy fed into the link by the electric drive.

Work machine

A device for emergency supply of a high voltage onboard network, in particular for the emergency load lowering of a work machine such as a crane or a cable excavator, comprising a high voltage onboard network having an electrical drive unit and a primary DC energy source for supplying the electrical drive unit with energy; a low voltage onboard network, preferably a 12 V, 24 V, or 48 V onboard network, having a low voltage rechargeable battery for taking up and outputting energy, wherein the high voltage onboard network and the low voltage onboard network are connected via a DC/DC converter to allow an energy flow from the high voltage onboard network in the direction of the low voltage onboard network. The DC/DC converter is preferably a bidirectional DC/DC converter to permit an energy flow from the low voltage onboard network in the direction of the high voltage onboard network.

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Wangen, Germany

Fabian Weber