POWER UNIT FOR SMALL-SIZED VEHICLE

摘要

A power unit for a small-sized vehicle has a valve gear device and a clutch device. The valve gear device has a valve operation mode change mechanism of hydraulically operated type, and the mechanism can change the mode of operation of an engine valve. The clutch device hydraulically switches between transmission and interruption of power and is placed between a crankshaft and a shift mechanism. The discharge opening of an oil pump (209) driven by power transmitted from the crankshaft is commonly connected to the valve operation mode change mechanism (63, 64) and the clutch device (102). The size of a hydraulic system is made compact while avoiding an increase in the size of the entire power unit. The power unit is suitable for mounting on a small-sized vehicle.