is not caused. Thus, the balance weight can be easily fixed to the balancer shaft by jointly fastening the balance weight to the side of the balancer driven gear.
According to the present invention, as the balancer gear is fitted to the balancer shaft via a spline, the fitting hole is provided to the end on the side of the balancer gear of the balancer shaft and the accessory driving member is fitted into the fitting hole, the accessory can be coaxially driven by the balancer shaft. Since a large space is not require to couple the accessory driving member though the balancer gear and the balancer weight are provided to the end of the shaft, the engine can be miniaturized.
According to the present invention, as the balance weightis provided on both ends of the balancer shaft, the balancer driven gear is provided to one end, the balance weight is integrated with the other end and the gear for driving the accessory is provided to the inner side of the balance weight, the gear for driving the accessory can be provided very near to the balance weight and it does not require a large space to attach the gear for driving the accessory. In addition, on the side of one end of the balancer shaft on which the balancer driven gear is provided, the driving shaft of one accessory is coaxially connected, the driving shaft of the other accessory is turned in parallel with the balancer shaft via the gear for driving the accessory on the