| 摘要 |
A balancer shaft is supported between a right case and a left case in parallel with a crankshaft. A balancer driven gear and a first balance weight are provided at one end with the balancer driven gear being interlocked with the crankshaft. The outer diameter R2 of a maximum diameter of the first balance weight is larger relative to a root circle diameter R1 of the balancer driven gear. The first balance weight is attached to an outside face of the balancer driven gear. A fitting end of a driving shaft is fitted into a fitting hole provided in the core at the end on the side on which the balancer driven gear is provided of the balancer shaft. The fitting end and the fitting hole are coupled to be integrally rotated and for driving a water pump. A second balance weight is integrated with the other end of the balancer shaft. A gear for driving an accessory is integrated with the base of the second balance weight and is engaged with an oil pump gear for driving an oil pump.
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