US 11,898,329 B2
Hydraulic control circuit for implement
Ian Brown, Bismarck, ND (US); and Jason Legatt, Bismarck, ND (US)
Assigned to DOOSAN BOBCAT NORTH AMERICA INC., West Fargo, ND (US)
Filed by Clark Equipment Company, West Fargo, ND (US)
Filed on Jun. 30, 2023, as Appl. No. 18/217,309.
Claims priority of provisional application 63/357,976, filed on Jul. 1, 2022.
Prior Publication US 2024/0003120 A1, Jan. 4, 2024
Int. Cl. E02F 9/22 (2006.01); F15B 7/00 (2006.01)
CPC E02F 9/2296 (2013.01) [F15B 7/006 (2013.01); F15B 2211/20553 (2013.01); F15B 2211/3058 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A hydraulic system for selectively providing pressurized hydraulic fluid flow to actuators on an implement configured to be hydraulically coupled to a power machine, the implement having a primary function actuator and at least one secondary function actuator, wherein the hydraulic system comprises:
a hydraulic interface including first and second conduits coupleable to the power machine, wherein each of the first and second conduits are configured to selectively receive pressurized hydraulic fluid from the power machine, and wherein the implement is configured to receive pressurized hydraulic fluid flow from only one of the first and second conduits at a time;
a hydraulic flow control circuit configured to selectively control pressurized hydraulic fluid flow to and from the primary function actuator and to and from at least one secondary function actuator in first and second modes of operation;
wherein in the first mode of operation the hydraulic flow control circuit is configured to receive pressurized hydraulic fluid flow from the first conduit and to provide the pressurized hydraulic fluid flow to the primary function actuator and to the at least one secondary function actuator, and wherein in the first mode of operation the hydraulic flow control circuit is configured to direct return flow of pressurized hydraulic fluid from the primary function actuator and from the at least one secondary function actuator through the second conduit for return to the power machine;
wherein in the second mode of operation the hydraulic flow control circuit is configured to receive pressurized hydraulic fluid flow from the second conduit, to prevent flow of pressurized hydraulic fluid flow to the primary function actuator, and to provide the pressurized hydraulic fluid flow to the at least one secondary function actuator, and wherein in the second mode of operation the hydraulic flow control circuit is configured to direct return flow of pressurized hydraulic fluid from the at least one secondary function actuator through the first conduit for return to the power machine.