| 摘要 |
PROBLEM TO BE SOLVED: To supply a sufficient pressure oil to change a cutting blade speed by improving a hydraulic piping structure without arranging a new hydraulic pump for a reaping hydraulic stepless transmission so as to improve the efficiency of reaping work. SOLUTION: A hydraulic driving circuit of a combine harvester is configured in such a manner that a main hydraulic pump 11 supplies the pressure oil to a travelling system circuit T and a working system circuit W, divides the pressure oil of a travelling charge pump 22 arranged in a hydraulic transmission charge circuit 1 for travelling to supply the same to a reaping transmission circuit 2, and merges the pressure oil divided from the working system circuit W with the reaping transmission circuit 2. COPYRIGHT: (C)2011,JPO&INPIT
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