| 摘要 |
PROBLEM TO BE SOLVED: To make the crankshaft width small and the engine width compact, in the starter of a vehicular engine such as a motor cycle. SOLUTION: A gear 23 for start is formed on the outer periphery surface of the crank web 8-6 of a crankshaft 1 by toothing directly and the gear 23 for start is meshed with the drive gear 35 for start of a start system gear train 29 connected to a start motor 33. The drive gear 35 for start can be used to a balancer drive gear commonly, separating from the primary gear 20 for wheel driving. The drive gear 35 for start, oneway clutch 48 and free wheel gear 36 are arranged on the first support shaft 31 of the rear upper side of the crankshaft 1 as the start system gear train 29 and further, an idle gear 67 and idle big gear 68 are arranged on the second support shaft 32 of the rear upper side and a start motor 33 and output gear 34 are arranged in front of the second support shaft 32.
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