US 12,292,061 B2
Fluid pressure circuit
Yoshiyuki Shimada, Tokyo (JP)
Assigned to EAGLE INDUSTRY CO., LTD., Tokyo (JP)
Appl. No. 18/714,010
Filed by EAGLE INDUSTRY CO., LTD., Tokyo (JP)
PCT Filed Nov. 30, 2022, PCT No. PCT/JP2022/044191
§ 371(c)(1), (2) Date May 28, 2024,
PCT Pub. No. WO2023/106179, PCT Pub. Date Jun. 15, 2023.
Claims priority of application No. 2021-200413 (JP), filed on Dec. 9, 2021.
Prior Publication US 2025/0035132 A1, Jan. 30, 2025
Int. Cl. F15B 11/02 (2006.01); F15B 11/024 (2006.01)
CPC F15B 11/024 (2013.01) [F15B 2011/0243 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fluid pressure circuit, comprising:
a tank that is configured to store a fluid;
a fluid supply source configured to supply the fluid in the tank;
a cylinder device extended and retracted by the fluid from the fluid supply source;
a switching valve disposed between the fluid supply source and the cylinder device and configured to switch between flow passages of the fluid;
a flow diversion valve located closer to a side of the cylinder device than the switching valve and configured to divert at least some of a return fluid returning from the cylinder device to the tank;
a regenerative drive source driven in a regenerative mode by the diverted return fluid;
an operating device configured to output a switching command corresponding to an operation to the switching valve; and
an actuating device configured to output a switching command to the flow diversion valve in response to operation of the operating device,
wherein a return flow passage through which the return fluid flows from the cylinder device to the regenerative drive source is provided with a control valve configured to have a closed position in which the return flow passage is closed and an open position in which the return flow passage is opened and to switch between the closed position and the open position in response to the operation of the operating device.