发明名称 |
SPEED CONTROLLER OF WHEEL TYPE HYDRAULIC TRAVELING VEHICLE |
摘要 |
<p>Control valves are respectively provided in a pair of variable displacement hydraulic pumps. If an ultra low speed travel signal is issued in response to an ultra-low-speed switch turned on, one of the control valves is fixed to a neutral position by a solenoid valve. And a displacement amount of a travel motor is fixed at a maximum displacement by another solenoid valve. In this way, an upper limit for motor rotation speed is significantly reduced. As a result, it is possible to realize the ultra low speed travel with maximum operation of an accelerator pedal, without the need for subtle operation of the accelerator pedal. <IMAGE></p> |
申请公布号 |
EP1321697(A4) |
申请公布日期 |
2009.12.09 |
申请号 |
EP20010963559 |
申请日期 |
2001.09.10 |
申请人 |
HITACHI CONSTRUCTION MACHINERY CO., LTD. |
发明人 |
ISHIMARU, HIDEHARU;SHINYA, TOSHIHIKO |
分类号 |
B60K17/10;B60W10/06;F02D29/04;F16H59/44;F16H61/42;F16H61/423;F16H61/431;F16H61/433;F16H61/444;F16H61/46;F16H61/47 |
主分类号 |
B60K17/10 |
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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