FOUR-STROKE CYCLE INTERNAL COMBUSTION ENGINE WITH BALANCER DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce the number of parts relating to a balancer drive gear and man-hours for balancer drive gear assembly in a 4-stroke cycle internal combustion engine equipped with a balancer device and a valve device for opening and closing an intake and exhaust valve. SOLUTION: The balancer drive gear for driving a balancer weight of the balancer device and a camshaft drive sprocket for driving a camshaft of the valve device are integrally formed and are integrally coupled with a clankshaft.