| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain an increase in internal pressure in a return circuit of a hydraulic fluid returned to a hydraulic fluid tank by passing through an oil cooler, in a working vehicle such as a crawler tractor having a two-pump/two-motor system hydrostatic continuously variable transmission for traveling. Ž<P>SOLUTION: The return circuit R of the hydraulic fluid returned to the hydraulic fluid tank 18 by passing through the oil cooler 45 from hydraulic pumps 22L and 22R for constituting the traveling hydrostatic continuously variable transmission 23, is branched off on the downstream side of the oil cooler 45. One Ra of this branched-off return circuit is returned to the hydraulic fluid tank 18, and the other Rb is connected to a suction circuit Pf of a charge pump 29 for supplying the hydraulic fluid to the traveling hydrostatic continuously variable transmission 23 or a suction circuit Pg of a gear pump 36 for supplying the hydraulic fluid to hydraulic actuators 34 and 35 for operating a working machine connected to a machine body. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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