发明名称 |
Hydraulic control system for working machine |
摘要 |
A hydraulic control system for a working machine according to the present invention includes a regulator control valve for controlling an operation of a pump regulator and a controller for sending a control signal for changing a discharge quantity of the pump to the regulator control valve in accordance with an operation amount of an operating means. On the basis of the control signal, a secondary pressure in the regulator control valve is fed to the pump regulator. This system further includes a fail-safe valve disposed in a control line joining the pump regulator and the regulator control valve. The fail-safe valve has an ordinary position for sending the secondary pressure to the pump regulator and a fail-safe position for sending an oil pressure from a path other than the regulator control valve to the pump regulator in such a manner that a predetermined discharge amount is ensured. The fail-safe valve is configured so as to switch from the ordinary position to the fail-safe position in accordance with a failure signal indicative of failure in the regulator control valve. According to this, while adopting an electronic control system for the pump, it is possible to continue a work even in the failed condition of the system. |
申请公布号 |
EP1577564(A3) |
申请公布日期 |
2005.12.28 |
申请号 |
EP20050102016 |
申请日期 |
2005.03.15 |
申请人 |
KOBELCO CONSTRUCTION MACHINERY CO., LTD. |
发明人 |
TOJI, YUTAKA;YAMAZAKI, YOICHIRO;OKA, HIDEKAZU |
分类号 |
E02F9/22;F04B49/00;F04B49/10;F04B49/22;F15B11/00;F15B11/16;F15B20/00 |
主分类号 |
E02F9/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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