| 摘要 |
PROBLEM TO BE SOLVED: To change the speed of a cutting blade of a reaper during change of traveling speed without trouble by supplying a pressurized oil sufficient for changing the speed of cutting blade to a continuously variable hydraulic transmission for reaping. SOLUTION: There is provided a hydraulic circuit of a combine harvester provided with a main hydraulic pump (11) for supplying pressurized oil to a traveling clutch operation hydraulic circuit (T) and a main hydraulic circuit (W) to control the attitude of a main body and lifting and lowering of a reaper-auger and a sub-hydraulic pump (22) for supplying pressurized oil to a continuously variable transmission circuit for traveling (1) and a continuously variable transmission circuit for reaping (2), wherein the hydraulic circuit is further provided with a replenishing oil channel (70) to apply a prescribed pressure to a relief oil from the main hydraulic circuit (W) and supply the oil to the continuously variable transmission circuit for reaping (2) as a charge oil. COPYRIGHT: (C)2011,JPO&INPIT
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