Hydraulic system of a work machine and work machine

By employing a dual hydraulic subsystem architecture and energy recovery technology, the flow imbalance problem caused by the difference in response speed between the hydraulic pump and the directional valve was solved, thus achieving stable operation and improved safety of the hydraulic system.

CN224786061UActive Publication Date: 2026-09-22ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202522478104.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-11-21
Publication Date
2026-09-22
Estimated Expiration
2035-11-21

AI Technical Summary

Technical Problem

In the hydraulic system of operating machinery, the difference in response speed between the hydraulic pump and the directional valve leads to an imbalance between flow supply and demand during braking, resulting in pressure buildup and hydraulic shock, which affects the stability and safety of the system.

Method used

The system adopts a dual hydraulic subsystem architecture, including a first hydraulic subsystem and a second hydraulic subsystem. By connecting the oil circuit and the energy recovery oil circuit, the second hydraulic pump recovers the excess flow of the first hydraulic pump. Combined with the switching of the motor's power generation mode and drive mode, flow balance and energy recovery are achieved.

Benefits of technology

It effectively avoids pressure buildup and hydraulic shock, ensures the smooth operation of the hydraulic system, extends the service life of the hydraulic pump, seals and connecting pipelines, and improves the safety and stability of the system.

✦ Generated by Eureka AI based on patent content.
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Abstract

The utility model belongs to operation machinery technical field and provide a kind of hydraulic system and operation machinery of operation machinery, and hydraulic system includes first hydraulic subsystem and second hydraulic subsystem, first hydraulic subsystem includes first hydraulic pump, first main valve, first actuating mechanism, second hydraulic subsystem includes second hydraulic pump, second main valve, second actuating mechanism, first hydraulic pump and second hydraulic pump between being equipped with intercommunicating oil circuit, intercommunicating oil circuit is equipped with hydraulic valve.If the maximum change rate of the speed (flow) of first hydraulic pump cannot satisfy the flow rate change rate requirement when first main valve is closed, the hydraulic control valve on the intercommunicating oil circuit can be opened, and the second hydraulic pump is operated in the direction of recovering the oil of first hydraulic pump, so that the excess flow generated by first hydraulic pump is recovered through second hydraulic pump, thereby avoiding the situation of pressure holding and hydraulic impact in the pipeline. At the same time, when the conditions permit, the motor on the second hydraulic pump can be driven by the high-pressure oil source to generate electricity.
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