| 摘要 |
PROBLEM TO BE SOLVED: To provide a power unit for a small-sized vehicle, wherein an output shaft is placed above a continuously variable transmission, and there are provided as a unit: an internal combustion engine having a crankshaft; a belt-type continuously variable transmission which has a driving shaft and a driven shaft, and is placed below the axis of the crankshaft, so that the rotational power of the crankshaft is transmitted to the drive shaft in the direction reverse to that of the crankshaft; and a power transmission device provided with an output shaft interlocked and connected to the driven shaft through a gear transmission mechanism, and even when a gear transmission is employed in place of a belt-type continuously variable transmission, a driving system from the output shaft to a driving wheel and the power-generation part of the internal combustion engine are commonly used, thus upsizing of the power unit is avoided. SOLUTION: The gear transmission mechanism 39 includes a single idle shaft 112 having an axis parallel to the crankshaft, and placed between a driven shaft 41 and an output shaft 37. The gear transmission mechanism 39 is placed between the driven shaft 41 and the output shaft 37 in such a manner that the driven shaft 41 and the output shaft 37 rotate in the same direction. COPYRIGHT: (C)2008,JPO&INPIT
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