| 摘要 |
PROBLEM TO BE SOLVED: To smoothly switch the drive by inhibiting the generation of large peak pressure in switching from front/rear wheel (four-wheel) drive to rear wheel (two wheel) drive, and to stably keep clutch performance by inhibiting pressure fluctuation such that main pressure is lowered for a specific time in a low rotating area of an engine where a flow rate of a pump is shorted. SOLUTION: In the travel vehicle provided with a clutch for front-wheel-drive in a rear-wheel driving system, a throttling valve with a check function is mounted between a hydraulic operating part of the clutch for front-wheel-drive and an oil pressure source. COPYRIGHT: (C)2005,JPO&NCIPI
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