TRANSMISSION STRUCTURE OF POWER UNIT FOR VEHICLE

摘要

In transmission structure of a power unit for a vehicle provided with a hydrostatic continuously variable transmission for shifting and transmitting driving force from an internal combustion engine to a rear wheel, as an oil passage for operating oil of a neutral/drive switching clutch is provided on the downstream side of an oil passage in the hydrostatic continuously variable transmission in related art, the operating pressure of the neutral/drive switching clutch lowers because of the loss of oil pressure and the present invention is made to address the problem. There are provided an oil pump that is rotated by the driving force of an internal combustion engine and supplies oil to a hydrostatic continuously variable transmission and a neutral/drive switching clutch which is arranged between the hydrostatic continuously variable transmission and a rear wheel, in which a hydraulic piston adjacent to each set of driving friction plates and driven friction plates is moved by pressure in an oil pressure chamber and which connects and disconnects the driving force. An oil passage to the neutral/drive switching clutch is branched from an oil passage from the oil pump to the upstream sid e of the hydrostatic continuously variable transmission.