公开(公告)号：US20240416992A1

公开(公告)日：2024-12-19

申请号：US18742950

申请日：2024-06-13

Applicant: Liebherr-Werk Bischofshofen GmbH

Inventor： Florian ALTENBERGER ,  Marco EDER ,  Johannes HOFBAUER ,  Josef STOCK ,  Reinhard WINDHOFER

IPC: B62D5/07 ,  B60T7/12 ,  B60T13/14 ,  B60T13/74 ,  B60T17/22 ,  B62D5/06 ,  F15B1/04 ,  F15B15/18 ,  H02K7/14

Abstract: The present disclosure relates to a hydraulic pump assembly comprising: a variable displacement pump, preferably a load-sensing variable displacement pump, for outputting a volume flow rate of a hydraulic fluid, an electric motor for driving the variable displacement pump, in particular a swashplate or swivel angle pump, via a variable-speed drive shaft, and a control unit which is connected to the variable displacement pump and the electric motor and is configured to provide a predetermined volume flow rate by controlling the variable displacement pump and the electric motor. The hydraulic pump assembly is characterized in that the pump assembly further comprises a temperature sensor connected to the control unit, which senses a winding temperature of the electric motor, wherein as long as the winding temperature is below a threshold, the control unit is configured to provide the predetermined volume flow rate.

公开(公告)号：US20230340968A1

公开(公告)日：2023-10-26

申请号：US17781922

申请日：2020-12-03

Applicant: LIEBHERR-WERK BISCHOFSHOFEN GMBH ,  DANFOSS SCOTLAND LTD.

Inventor： Rupert GAPPMAIER ,  Florian ALTENBERGER ,  Hans KNAPP ,  Josef STOCK ,  Alexis DOLE ,  Callan MACKAY

IPC: F15B11/17 ,  E02F9/22 ,  E02F3/42 ,  F15B13/06

CPC classification number: F15B11/17 ,  E02F9/2292 ,  E02F3/422 ,  F15B13/06 ,  E02F9/2267 ,  E02F9/2225 ,  E02F9/225 ,  F15B2211/20576

Abstract: The present invention relates to a switching valve block for a hydraulically actuable work machine that comprises a plurality of valve block inputs for a respective connection to a pressure output of one or more hydraulic fluid pumps, a plurality of valve block outputs for outputting a pressurized hydraulic fluid, and at least one valve that is arranged between valve block inputs and valve block outputs and is adapted to selectively produce a fluid connection between a first valve block input and a first valve block output or between a first valve block input and a second valve block output. The invention is characterized in that the first valve block output furthermore already has a fixed fluid connection to a second valve block input.

公开(公告)号：US20220251804A1

公开(公告)日：2022-08-11

申请号：US17620131

申请日：2020-06-25

Applicant: LIEBHERR-WERK BISCHOFSHOFEN GMBH

Inventor： Hans KNAPP ,  Josef STOCK ,  Rupert GAPPMAIER ,  Christoph KIEGERL ,  Reinhard WINDHOFER ,  Florian ALTENBERGER

IPC: E02F9/22 ,  F15B11/04

Abstract: The present invention relates to a mobile work machine, in particular to a wheeled loader, having a hydraulic circuit, having a pump for conveying a hydraulic medium through the hydraulic circuit, and having at least one control block having an inflow control edge and an outflow control edge for controlling the flow of the hydraulic medium, wherein the work machine has a working tool and a cylinder for actuating the working tool and wherein the cylinder has an outflow and in inflow for the hydraulic medium, and wherein the outflow is in fluid communication with the outflow control edge and the inflow is in fluid communication with the inflow control edge, and wherein the inflow control edge does not have any or has fewer fine control notches than the outflow control edge and thus works in a largely unrestricted manner, while the outflow control edge is equipped with one or more fine control notches so that with a pulling load at the working tool, the outflow control edge restricts the outflow amount through the outflow of the cylinder.