| 摘要 |
PURPOSE:To eliminate the need of a valve stem driving intermediate shaft by disposing a suction rotary valve stem approximately at right angles to a crankshaft, making one end of the stem mesh with the gears of the crankshaft, a transmission main shaft and a primary shaft and forming a suction port at the upper part of a crankcase. CONSTITUTION:A primary shaft 16 is arranged in parallel with a crankshaft 7 inside a transmission case 13. A primary driven gear 17 and a valve drive gear 18 are engaged with said shaft 16 and the prime driven gear 17 is in mesh with a primary drive gear 19 which is engaged with the crankshaft 7. A valve stem 20 is rotatably supported by a crankshaft 7 at right angles with respect to said crankshaft 7 namely, in the vertical direction inside the transmission case 13 and a valve driven gear 21 which mesh with said valve drive gear 18 is provided at the lower end thereof. |
