Sany Group has filed a patent for a hydraulic system that can switch between fixed-displacement and fixed/variable-displacement modes. The system includes an oil tank, working pump, control cylinder, working oil line, load-sensing system, load-sensing valve, and switching-control valve. Operators can switch between modes to achieve a balance between energy conservation and performance. GlobalData’s report on Sany Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Sany Group, ceramic membrane fuel cells was a key innovation area identified from patents. Sany Group's grant share as of September 2023 was 64%. Grant share is based on the ratio of number of grants to total number of patents.

Hydraulic system switchable between fixed and variable displacement

Source: United States Patent and Trademark Office (USPTO). Credit: Sany Group Co Ltd

A recently filed patent (Publication Number: US20230294759A1) describes a hydraulic system that can switch between fixed-displacement and fixed/variable-displacement. The system includes an oil tank with supply and return ports, a working pump with a displacement changing mechanism, and a control cylinder for controlling the displacement mechanism. A working oil line is connected to the output of the pump, and a load-sensing system with a load-sensing circuit outputs hydraulic pressure based on the load. The load-sensing valve and the fixed/variable-displacement switching control valve are in fluid communication with the output main path and the control ports of the load-sensing valve. The fixed/variable-displacement switching control valve can be switched between two positions, allowing either the load-sensing circuit or the working oil line to be in fluid communication with the load-sensing valve. When the differential pressure between the input pressure of the control ports is greater than a threshold, the output main path is in fluid communication with the control cylinder, and when it is less than the threshold, the control cylinder is in fluid communication with the oil return port of the tank.

The hydraulic system described in the patent also includes a pressure cut-off control valve that allows fluid communication between the load-sensing valve and the control cylinder based on the differential pressure between the output main path and the oil return port of the tank. Additionally, the system features a solenoid valve and a shuttle valve for controlling the fixed/variable-displacement switching control valve. The solenoid valve can provide fluid communication between the shuttle valve and either the control oil line or the oil return port of the tank, determining the position of the fixed/variable-displacement switching control valve.

The patent also describes a control method for the hydraulic system, which involves controlling the fixed/variable-displacement switching control valve to be in the first valve position when the load-sensing circuit is in fluid communication with the second control port. When the differential pressure between the control ports is greater than a threshold, the working pump is in a variable displacement state, and when it is less than the threshold, the working pump is in a fixed displacement state.

The patent application also mentions the use of the hydraulic system in a working machine, such as a steering pump for providing steering hydraulic pressure.

Overall, this patent describes a hydraulic system that can switch between fixed-displacement and fixed/variable-displacement, offering flexibility and control in various applications.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.