| 摘要 |
PURPOSE:To absorb the torsional vibration of a crank shaft without making the crank shaft complicated and large-scale, by providing a torsional vibration damping portion in a counter weight. CONSTITUTION:A crank shaft 12 is provided with upper and lower counter weights 23. Each counter weight 23 has a rubber member 28B for balancing inertial forces due to the mass of a rotating portion and a reciprocating portion as applied to the crank shaft 12. Therefore, the counter weights 23 function simultaneously as a torsional vibration damper. With this arrangement, it is possible to absorb the torsional vibration of the crank shaft without making the crank shaft complicated and large-scale. |
