HYDRAULIC DRIVE SYSTEM OF CONSTRUCTION MACHINE |
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| 申请号 | US15556016 | 申请日 | 2016-03-07 | 公开(公告)号 | US20180058040A1 | 公开(公告)日 | 2018-03-01 |
| 申请人 | KAWASAKI JUKOGYO KABUSHIKI KAISHA; | 发明人 | Akihiro KONDO; | ||||
| 摘要 | A hydraulic drive system of a construction machine includes: a control valve configured such that an opening area of a center bypass passage gradually decreases in accordance with increase in an operation signal; an operation device that outputs the operation signal; a bleed-off line; and a bleed-off valve that includes a pilot port to which a secondary pressure from a solenoid proportional valve is led, the bleed-off valve being configured such that: a bypass passage is open until the operation signal exceeds a first setting value, and the bypass passage is closed when the operation signal exceeds the first setting value; and an unloading passage is opened when the operation signal exceeds a second setting value, and an opening area of the unloading passage gradually decreases until the operation signal that has exceeded the second setting value reaches a third setting value. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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