发明名称 |
HYDRAULIC EXCAVATOR DRIVE SYSTEM |
摘要 |
A hydraulic excavator drive system includes: a cylinder that drives a moving part that is an arm or a bucket. Hydraulic oil is supplied from a hydraulic pump to the cylinder via a control valve. A bypass line branches off from a rod-side supply/discharge line. The bypass line is blocked and opened by a restrictor. The restrictor is controlled by a controller such that, when the hydraulic oil is supplied to the cylinder through a head-side supply/discharge line, the restrictor blocks the bypass line if a pressure detected by a load detector is lower than a predetermined value, and opens the bypass line if the pressure detected by the load detector is higher than or equal to the predetermined value. |
申请公布号 |
US2017107694(A1) |
申请公布日期 |
2017.04.20 |
申请号 |
US201515129215 |
申请日期 |
2015.02.16 |
申请人 |
KAWASAKI JUKOGYO KABUSHIKI KAISHA |
发明人 |
KONDO Akihiro;ITO Makoto;FUJIYAMA Kazuto |
分类号 |
E02F9/22;F15B11/08;F15B13/04;E02F3/42 |
主分类号 |
E02F9/22 |
代理机构 |
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代理人 |
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主权项 |
1. A hydraulic excavator drive system comprising:
a cylinder that drives a moving part that is an arm or a bucket; a control valve connected to the cylinder by a head-side supply/discharge line and a rod-side supply/discharge line; a hydraulic pump that supplies hydraulic oil to the cylinder via the control valve; a load detector that detects a pressure of the hydraulic oil discharged from the hydraulic pump or a pressure of the hydraulic oil supplied to the cylinder through the head-side supply/discharge line; a bypass line that branches off from the rod-side supply/discharge line and connects to a tank; a restrictor that blocks and opens the bypass line; and a controller that controls the restrictor such that, when the hydraulic oil is supplied to the cylinder through the head-side supply/discharge line, the restrictor blocks the bypass line if the pressure detected by the load detector is lower than a predetermined value, and opens the bypass line if the pressure detected by the load detector is higher than or equal to the predetermined value. |
地址 |
Kobe-shi, Hyogo JP |