To obtain a sufficient cooling effect in spite of a small-sized oil cooler when cooling oil supplied to a hydraulic continuously-variable transmission gear.
When power produced in an engine 7 is changed in speed by the hydraulic continuously-variable transmission gear 8, the hydraulic continuously-variable transmission gear 8 comprises oil supply passages (oil supply pipes 22, 24, 26, and 27) laid from an oil tank (transmission 9) to an oil inlet 8a of the hydraulic continuously-variable transmission gear 8, an oil return passage (oil return pipe 28) laid from an oil outlet 8b of the hydraulic continuously-variable transmission gear 8 to the oil tank, and an oil cooler 23 provided in the oil supply passages and supplied to the hydraulic continuously-variable transmission gear 8. A cooling pipe 25 further cooling oil supplied to the hydraulic continuously-variable transmission gear 8 is arranged in oil supply passages (oil supply pipes 26 and 27) laid from the oil cooler 23 to the hydraulic continuously-variable transmission gear 8.
TANAKA SHUJI
KOMATSU HITOSHI
SHIN JIRO
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