| 摘要 |
PROBLEM TO BE SOLVED: To provide a work vehicle capable of always supplementing a stable charge pressure oil to a closed circuit. SOLUTION: A pressure oil from a variable displacement hydraulic pump 11 is fed to a charge valve 12 through a pressure-compensating valve 13. The charge pressure oil with a predetermined pressure or higher is always output from the charge valve 12 to a charge pressure oil passage 39. The charge pressure oil passage 39 is connected to the oil passages 31 and 32 of an HST circuit through check valves 23a and 23b. When a solenoid proportional valve 18 is controlled by a controller 30, a pilot pressure output from the solenoid proportional valve 18 is controlled to control a charged flow amount output from the charge valve 12. A charged flow amount required in the HST circuit can be supplemented from the charge pressure oil passage 39. COPYRIGHT: (C)2007,JPO&INPIT
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