| 摘要 |
PROBLEM TO BE SOLVED: To provide a low cost hydraulic drive system capable of high speed and highly accurate machining, conserving energy, using a low capacity motor and minimizing degrees of temperature rise. SOLUTION: A basic circuit 2 and a power assist circuit 3 are connected to a hydraulic cylinder 1. While the basic circuit 2 dives the hydraulic cylinder 1 with no-load, the power assist circuit 3 accumulates oil to supply to the hydraulic cylinder 1 only when the hydraulic cylinder 1 is loaded.
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