Radial piston hydraulic device distributing flow by pilot operated check valves and operating method thereof

A radial piston hydraulic device distributing flow by pilot operated check valves, comprising:

• a housing;
• a plurality of piston assemblies;
• a main shaft;
• first pilot operated check valves having a same number as the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies;
• second pilot operated check valves having a same number as the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies;
• and
• a valve plate;
• wherein the housing defines a plurality of piston chambers and a distribution chamber;
• the distribution chamber defines a high pressure main port and a low pressure main port;
• wherein each of the piston assemblies is slidable up and down in a corresponding piston chamber of the plurality of piston chambers;
• wherein the main shaft is rotatably connected with the housing and is connected with the plurality of piston assemblies in a transmission way;
• wherein the valve plate is rotatably mounted in the distribution chamber;
• the valve plate is fixedly connected with the main shaft;
• the valve plate defines high pressure distribution grooves communicated with the high pressure main port and low pressure distribution grooves communicated with the low pressure main port;
• wherein each of the first pilot operated check valves comprises a first check valve body and a first check valve core;
• each first check valve body comprises a first movable chamber, a first valve body oil control chamber, a first valve body high pressure chamber, and a first valve body low pressure chamber;
• each first check valve core is movably mounted in a corresponding first check valve body and is configured to control opening and closing between a corresponding first valve body high pressure chamber and a corresponding first valve body low pressure chamber;
• each first valve body low pressure chamber is communicated with a corresponding piston chamber of the plurality of piston chambers;
• each first valve body high pressure chamber is communicated with the high pressure main port;
• each first valve body oil control chamber is alternately communicated with the high pressure distribution grooves and the low pressure distribution grooves;
• wherein each of the second pilot operated check valves comprises a second check valve body and a second check valve core;
• each second check valve body comprises a second movable chamber, a second valve body oil control chamber, a second valve body high pressure chamber, and a second valve body low pressure chamber;
• each second check valve core is movably mounted in a corresponding second check valve body and is configured to control opening and closing between a corresponding second valve body high pressure chamber and a corresponding second valve body low pressure chamber;
• each second valve body high pressure chamber is communicated with a corresponding piston chamber of the plurality of piston chambers;
• each second valve body low pressure chamber is communicated with the low pressure main port;
• each second valve body oil control chamber is alternately communicated with the high pressure distribution grooves and the low pressure distribution grooves.