| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that, in the case that a main hydraulic pump driven by a vehicle engine for traveling, a sub hydraulic pump driven by a working battery and a mode selection means for selecting both the hydraulic pumps are provided, when the sub hydraulic pump is selected during the lowering of a capacity of the working battery, driving cannot be performed by the sub hydraulic pump, and thus, troublesome operation is required to suspend work and reselect driving by the main hydraulic pump. SOLUTION: In this hydraulic supply device for a working machine, the remaining capacity of the working battery 5 and operations of operation means 12a, 13a are detected. In the case that the sub-hydraulic pump 7 is selected, when the remaining capacity exceeds a predetermined capacity and the operation means 12a, 13a are operated, the sub hydraulic pump 7 can be driven for a predetermined time. When the remaining capacity does not exceed the predetermined capacity and when a driving time of an electric motor 6 reaches a predetermined time, the driving of the main hydraulic pump 3 is automatically performed. Even if the sub hydraulic pump 7 is selected, if the driving cannot be performed by the sub-hydraulic pump 7, the driving is performed by the main hydraulic pump 3. COPYRIGHT: (C)2009,JPO&INPIT
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