To simplify lubricating oil feeding to engine parts, and the driving oil feeding system of hydrostatic continuously variable transmissions, and compact the overall of an internal combustion engine power unit.
An internal combustion engine power unit 4 incorporates a hydrostatic continuously variable transmission 40 in a crankcase 10 delimiting an engine section. The hydrostatic continuously variable transmission 40 comprises a hydraulic pump 42 and a hydraulic motor 44 juxtaposed on a driveshaft 43. The driveshaft 43 is parallel with a crankshaft 5, and has an oil passage 45 that passes through the axis thereof. Engine oil is supplied to the oil passage 45, in which it is used as driving oil for the hydrostatic continuously variable transmission 40 and via which it is further fed to a cylinder head 14, an ACG 35 and a multi-step transmission 46.
SAITO MITSURU
TAWARA HIDEYUKI
