Load sensing type driving system

Abstract

The invention relates to a load sensing type driving system. The system comprises a pump, and at least a double-effect consumer whose pressure medium is supplied by the pump, especially a differentialcylinder. To control each consumer, a control directional valve and a pressure medium storage device are provided, and the connections from the pressure medium storage device and the corresponding directional valve to return pipes of a container are respectively controlled through feedback valves. The feedback valves are respectively loaded through a load of the consumer and a spring device towards a direction of a drainage position, and loading is performed towards the direction of a loading direction of a memory through a maximum loading pressure of the consumer of the driving system. In the drainage position, the allocated return pipeline is connected with the container, and in the loading position of the memory, the allocated return pipe is connected with the pressure medium storage device.

Description

technical field [0001] The invention relates to a load-sensing drive system with a pump and at least one double-acting consumer, in particular a differential cylinder, supplied with pressure medium by the pump, wherein a control directional valve is provided for controlling each consumer Furthermore, a pressure medium accumulator is provided, the connection of which to the return line from the respective control directional valve to the container is controlled in each case by means of a feedback valve. Background technique [0002] Hydraulic drive systems designed as load-sensing drive systems are used in mobile work machines. In load-sensing drive systems, pumps can be used to provide different load pressures for different consumers. When simultaneously controlling several consumers with different load pressures, the pump is adjusted to the highest load pressure of the controlled consumer. On the consumer with the lower load pressure, a pressure compensator is respectivel...

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Problems solved by technology

This has the consequence that the current load pressure communicated to the feedback valve of the consumer also increases

As a result, at an increased current load pressure of the associated consumer, the feedback valve is acted too early into the discharge position in which the return line of the consumer is connected to the container and The connection to the pressure medium accumulator is thus cut off, since the feedback valve of DE 10 2013 101 107 A1 cannot distinguish whether the current load pressure of the associated consumer is due to the load acting on this consumer or via switching on the pressure medium accumulator the pressure achieved

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