PURPOSE: To supply lube oil to a hydraulic clutch regardless of engagement state by energizing a cutoff valve in a second connecting oil path to its cutoff position and also pushing/moving the cutoff valve to a communicating position by oil pressure discharged from a discharging port of a second hydraulic pump and introducing this pressure oil to the lubricating part of the hydraulic clutch through a lube oil path.
CONSTITUTION: A shutoff valve 32 capable of switching a shutoff position for shutting off communication of a second connecting oil path 15 to/from a communicating position for allowing the communication is mounted in the second connecting oil path 15 and the shutoff valve 32 is energized to its shutoff position by an energizing means 30. Discharged oil pressure from the discharging port 13 of a second hydraulic pump Pr is made as pushing/moving oil pressure and the shutoff valve 32 can be pushed and moved to the communicating position against the energizing means 30 and a lube oil path 53 is provided for introducing pressure oil for generating pushing/moving oil pressure to the lubricating part 27 of a hydraulic clutch C. Thereby, the hydraulic clutch can be lubricated by the pressure oil for generating the pushing/moving oil pressure even if there is no rotational speed difference between front and rear driving wheels and both hydraulic pumps generate no pressure oil for placing the hydraulic clutch in its engagement.
YAKOU TAKAYUKI
KURODA KOJI
ARAI KENTARO
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