| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic closed circuit system capable of improving a rising characteristic of a flow rate and pressure in the rotational initial movement of a bidirectional hydraulic pump. <P>SOLUTION: This hydraulic closed circuit system 100 capable of driving a hydraulic cylinder 3 having a first port 3b and a second port 3c, includes: the hydraulic pump 1 having a first pump port 1a fluidly communicated with the first port 3b via a first pipe conduit C1, and a second pump port 1b fluidly communicated with the second port 3c via a second pipe conduit C2; an electric motor 2 for controlling rotation of the hydraulic pump 1; relief valves 20L and 20R respectively arranged in the first pipe conduit C1 and the second pipe conduit C2; and check valves 21L and 21R connected in parallel to the respective relief valves 20L and 20R and stopping a flow of a hydraulic fluid to the hydraulic cylinder 3 from the hydraulic pump 1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
