| 摘要 |
A hydraulic circuit 1, for a work machine (e.g. excavator) 3, comprising: a hydraulic motor (e.g. slew motor) 13; a pilot pressure system 4,5,6 configured to supply hydraulic fluid at a pilot pressure to one or more components of the work machine 3; and a make-up pressure system 23,24,25 in hydraulic fluid communication with the pilot pressure system 4,5,6 and the motor 13, and configured to supply hydraulic fluid to the motor 13 from the pilot pressure system 4,5,6 if the hydraulic fluid pressure in a part of the motor 13 is below a threshold pressure such that, during deceleration of the motor 13, the make-up pressure system 23,24,25 is operable to supply fluid from the pilot pressure system 4,5,6 to the motor 13 to reduce the risk of cavitation. The circuit 1 may contain a hydraulic actuator controlled by a control valve. The make-up pressure system 23,24,25 may include valves (e.g. check valves, solenoid valves, or pilot operated valves) 26 configured to restrict flow of fluid between the hydraulic motor 13 and the pilot pressure system 4,5,6. |
