| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic circuit driving a hydraulic actuator at speed in response to the manipulated variable of an operation means such as an operating lever and reducing an energy loss. <P>SOLUTION: The hydraulic circuit 20 supplies hydraulic fluid delivered from a variable displacement hydraulic pump 18 driven by an engine 3 to a bucket cylinder 16, thereby driving the bucket cylinder 16. The hydraulic circuit 20 includes a rotational speed sensor 54 detecting the engine speed of the engine 3, a manipulated variable detection means 41 detecting the manipulated variable of an operating valve 31 for a bucket, and a capacity adjusting device 50 changing the capacity of the hydraulic pump 18. The hydraulic circuit 20 further includes a controller 13. The controller 13 calculates a target discharge flow rate based on the detected manipulated variable, and controls the capacity adjusting device 50 according to the target discharge flow rate and the detected engine speed of the engine 3. <P>COPYRIGHT: (C)2011,JPO&INPIT |
