US 11,781,537 B2
Radial piston hydraulic device distributed by pilot operated check valves
Tong Guo, Quanzhou (CN); Tao Luo, Quanzhou (CN); Tianliang Lin, Quanzhou (CN); Qihuai Chen, Quanzhou (CN); Haoling Ren, Quanzhou (CN); Cheng Miao, Quanzhou (CN); and Shengjie Fu, Quanzhou (CN)
Assigned to HUAQIAO UNIVERSITY, Quanzhou (CN)
Filed by HUAQIAO UNIVERSITY, Quanzhou (CN)
Filed on Aug. 3, 2022, as Appl. No. 17/880,611.
Claims priority of application No. 202110885537.0 (CN), filed on Aug. 3, 2021.
Prior Publication US 2023/0042317 A1, Feb. 9, 2023
Int. Cl. F04B 1/0465 (2020.01); F04B 1/0408 (2020.01); F04B 53/16 (2006.01)
CPC F04B 1/0465 (2013.01) [F04B 1/0408 (2013.01); F04B 53/16 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A radial piston hydraulic device distributed by pilot operated check valves, comprising:
a housing;
a plurality of piston assemblies;
a main shaft;
a rotating shaft;
first pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies; and
second pilot operated check valves having a same number with the plurality of piston assemblies and one-to-one corresponding to the plurality of piston assemblies;
wherein the housing comprises a plurality of piston chambers, a rotating shaft chamber, a high-pressure oil passage, and a low-pressure oil passage;
wherein each of the plurality of 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 to the housing and is connected to the plurality of piston assemblies in a transmission way;
wherein the rotating shaft is rotatably mounted in the rotating shaft chamber and is fixedly connected to the main shaft; a control oil groove, a pressure relief oil groove, a first distribution ring groove, and a second distribution ring groove are provided on an outer periphery of the rotating shaft; the control oil groove is communicated with the high-pressure oil passage; the pressure relief oil groove is communicated with the low-pressure oil passage; the first distribution ring groove is divided into a first distribution upper half ring groove and a first distribution lower half ring groove; the second distribution ring groove is divided into a second distribution upper half ring groove and a second distribution lower half ring groove; the control oil groove is communicated with the first distribution upper half ring groove and the second distribution lower half ring groove; the pressure relief oil groove is communicated with the first distribution lower half ring groove and the second distribution upper half ring groove;
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 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 on-off 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 oil passage; and each first valve body oil control chamber is alternately communicated with the first distribution upper half ring groove and the first distribution lower half ring groove;
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 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 on-off 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 oil passage; each second valve body oil control chamber is alternately communicated with the second distribution upper half ring groove and the second distribution lower half ring groove.