Damper cooling structure for internal combustion engine

A disc-shaped damper (5) is attached to the tip of a crankshaft (4) of an internal combustion engine, and the damper is covered by a damper cover (11) having a cup-shaped section (12). The cup-shaped part (12) is provided with an air inlet (21) used for taking air into the cup-shaped part (12) through a pump action accompanying rotation of the damper (5); and an air outlet (22) for discharging the heated air. The air inlet (21) and the air outlet (22) are offset from each other in the axial direction of the crankshaft (4), and air flowing in from the air inlet (21) is discharged from the air outlet (22) after rotating at least one circle. The air flows over the entire circumference of the damper (5), and thus effective cooling can be performed. 在内燃机的曲轴(4)前端安装有圆盘状的减震器(5)，该减震器由具有杯状部(12)的减震器罩(11)覆盖。杯状部(12)具有：空气入口(21)，其用于通过伴随着减震器(5)的旋转的泵作用而向杯状部(12)内取入空气；以及空气出口(22)，其用于将被加热的空气排出。空气入口(21)和空气出口(22)在曲轴(4)的轴向上相互偏置，从空气入口(21)流入的空气在至少回旋1圈之后从空气出口(22)排出。空气在减震器(5)的整周流动，因此能够实施有效的冷却。