To provide a hydraulic driving device of a treating machine and a self-travelling treating machine wherein excess conveying capacity of either one of a first conveyor or a second conveyor can be utilized to compensate shortage of the conveying capacity of the other conveyor.
A ratio-changing circuit 50 (a hydraulic circuit) is arranged between a supply conduit 36 for the first conveyor, which guides pressure oil from a control valve 32 for the first conveyor to a hydraulic pressure motor 22 for the first conveyor, and a supply conduit 37 for the second conveyor, which guides the pressure oil from a control valve 33 for the second conveyor to a hydraulic pressure motor 23 for the second conveyor. The ratio changing circuit 50 guides a part of the pressure oil from the supply conduit 37 for the second conveyor to the supply conduit 36 for the first conveyor by a direction-control valve 52 and a flow-dividing valve 51. Thus, a ratio of the amount of flow of the pressure oil distributed to the hydraulic pressure motor 22 for the first conveyor and a ratio of the amount of flow of the pressure oil distributed to the hydraulic pressure motor 23 for the second conveyor are changed.
TANAKA MASAMICHI
SHIOHATA TADASHI
HASEBE TAKAHISA
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