HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY AND CONTROL DEVICE FOR SAME |
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| 申请号 | EP13827990 | 申请日 | 2013-04-11 | 公开(公告)号 | EP2884117A4 | 公开(公告)日 | 2015-09-09 |
| 申请人 | SUMITOMO SHI CONSTR MACH CO; | 发明人 | HASHIMOTO HIROFUMI; | ||||
| 摘要 | A hydraulic circuit for a construction machine including a center bypass passage, into which a pressurized oil discharged from a hydraulic pump may be supplied, including a directional control valve group including a plurality of directional control valves arranged in tandem with the center bypass passage; and a bleed-off valve arranged in the center bypass passage on a downstream side of the directional control valve group, wherein each directional control valve includes a first internal passage for causing the pressurized oil supplied to the directional control valve to flow out to the center bypass passage and a second internal passage for supplying the pressurized oil to a cylinder port, wherein a parallel passage is formed by the center bypass passage and the first internal passage by causing, by the first internal passage, the pressurized oil discharged from the hydraulic pump to flow out to the center bypass passage on the downstream side of the directional control valve, wherein the second internal passage supplies the pressurized oil from the center bypass passage through an opening of a spool and/or the bypass passage to the cylinder port. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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