| 摘要 |
PURPOSE:To surely eliminate surely engine vibration occurring due to inertial force accompanying reciprocating motion of a piston and connection rod small end portion. CONSTITUTION:In an outboard engine 4 wherein a crank shaft 13 is supported within a crank case 11, a piston 15 is contained, reciprocating, in a cylinder block 12 disposed within the crank case, and the piston and the crank shaft are connected to a connection rod 26, in the crank shaft are formed plural crank webs 27A-d on both sides of a connection portion to the connection rod. Then, in the crank case 11 balancers 29 are disposed within the range of crank webs positioned at both ends in longitudinal direction of the crank shaft 13. The balancers are rotation-driven by the crank shaft through a drive gear 31. |
