| 摘要 |
PROBLEM TO BE SOLVED: To provide a combine harvester equipped with a travel transmission which has a travel HST and a turn HST in a simple structure. SOLUTION: This travel device uses a travel HST 20, a turn HST 70 and a pair of hydraulic clutches 44. The turning diameter of the travel device can freely and steplessly selected from a gentle turn and a braked turn to a steep turn, and a clutch can easily and smoothly be switched by the utilization of a hydraulic pressure to turn the travel device in high safety. The turn HST 70 is disposed in a port block 22 integrated with the travel HST 20, and a hydraulic circuit 22a for connecting a variable volume hydraulic pump 21 for travel to a hydraulic pump 23 for travel and a hydraulic circuit 22b for connecting a variable volume hydraulic pump 71 for turn to a hydraulic pump 73 for turn are disposed in the port block 22, respectively. Therefore, the travel device has a simpler structure than a travel device in which a hydraulic circuit 72 for connecting the variable volume hydraulic pump 71 for turn to the hydraulic pump 73 for turn is disposed on the outside of a transmission, and the travel device contributes to the downsizing of the transmission.
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