Hydraulic system for a fall-back support and work machine
AssigneeLiebherr-Werk Nenzing GmbH
InventorsMartin Furxer, Markus Schwarzhans
Life of this patent
Estimating the term…
Abstract
A hydraulic system for operating a hydraulic fall-back support of a work machine including at least one hydraulic fall-back support cylinder for tracking and limiting movements of a boom of the work machine and a hydraulic pump by means of which the fall-back support cylinder and at least one further hydraulic consumer can be supplied with hydraulic fluid. A stop valve having a blocking position and a passage position is connected between the hydraulic pump and the fall-back support cylinder, by means of which the stop valve and a load-bearing cylinder space of the fall-back support cylinder is blockable and a hydraulic store connected to the load-bearing cylinder space is provided between the stop valve and the fall-back support cylinder.
Claims16
A hydraulic system for operating a hydraulic fall-back support of a work machine comprising:
- at least one hydraulic fall-back support cylinder for tracking and limiting movements of a boom of the work machine;
- and
- a hydraulic pump by means of which the fall-back support cylinder and at least one further hydraulic consumer can be supplied with hydraulic fluid;
- wherein a stop valve having a blocking position and a passage position are connected between the hydraulic pump and the fall-back support cylinder, by means of which stop valve a load-bearing cylinder space of the fall-back support cylinder is blockable;
- and wherein a hydraulic store connected to the load-bearing cylinder space is provided between the stop valve and the fall-back support cylinder;
- and
- wherein the stop valve is hydraulically controllable by means of a switching valve.
A hydraulic system for operating a hydraulic fall-back support of a work machine comprising:
- at least one hydraulic fall-back support cylinder for tracking and limiting movements of a boom of the work machine;
- and
- a hydraulic pump by means of which the fall-back support cylinder and at least one further hydraulic consumer can be supplied with hydraulic fluid;
- wherein a stop valve having a blocking position and a passage position are connected between the hydraulic pump and the fall-back support cylinder, by means of which stop valve a load-bearing cylinder space of the fall-back support cylinder is blockable;
- and wherein a hydraulic store connected to the load-bearing cylinder space is provided between the stop valve and the fall-back support cylinder;
- and
- wherein the stop valve is hydraulically controllable and has a control connection that is connected to an output of a hydraulic shuttle valve.
A work machine, comprising a pivotable boom, a setting device for adjusting the boom, at least one fall-back support cylinder connected to the boom and following its movements, and a hydraulic systems;
- wherein a control is provided by means of which a stop valve and the setting device are indirectly or directly controllable and that are configured to switch the stop valve into a passage position on actuation of the setting device;
- and
- wherein a further valve is arranged between the stop valve and a hydraulic pump and one check valve per fall-back support cylinder, with the control being configured to receive a signal for actuating the setting device from an input unit to move the boom, to thereupon switch the valve into a passage position, and to leave the stop valve in a blocking position, to switch the stop valve into the passage position after opening the check valve, and to subsequently actuate the setting device.
Dependencies are inferred from the claim text.