| 摘要 |
PROBLEM TO BE SOLVED: To provide a combine harvester equipped with a traveling side HST having a travel pump and a travel motor both of variable capacity type, improved in reaping operating efficiency. SOLUTION: The combine harvester works as follows: among a pair of HST lines where the travel pump 120P and the travel motor 120M are in fluid connection with each other, when the hydraulic pressure of the HST line 129a on the side becoming higher pressure in traveling forward is at a predetermined level or lower, such a smaller-displacement control mode as to control a pump actuator 320 is selected so that the output of the travel side HST120 is varied correspondingly to the operational position of a variable-speed operating member 310 in the state of putting a motor actuator 330 under control so as to make the travel motor 120M in a smaller-displacement condition; whereas, when the hydraulic pressure exceeds the predetermined level, the mode is shifted to such a larger-displacement control mode as to control the pump actuator 320 so that the output of the travel side HST120 is varied correspondingly to the operational position of a variable-speed operating member 310 in the state of putting a motor actuator 330 under control so as to make the travel motor 120M in a larger-displacement condition via a shifting control mode. COPYRIGHT: (C)2009,JPO&INPIT
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