| 摘要 |
PROBLEM TO BE SOLVED: To enhance working efficiency by overcoming the following problems: a prime mover for outputting great horsepower has to be mounted so as to drive a hydraulic infinite variable-speed drive; and the working efficiency is decreased in such a constitution as to reduce a vehicle speed. SOLUTION: A combine is provided with: the hydraulic infinite variable-speed drive 9 which has a hydraulic pump 10 and a hydraulic motor 11, and outputs rotating power to a transmission mechanism A; a second transmission mechanism B which transmits the rotating power to the transmission mechanism A without the medium of the drive 9; and a switching means which enables switching between the drive 9 and the mechanism B. When the switching means is switched to the side of the mechanism B, oil transfer via a closed circuit of the drive 9 is brought to a halt. COPYRIGHT: (C)2004,JPO
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