| 摘要 |
PURPOSE:To reduce bending vibrations, by setting a vibromotive force with balancers to work more to a position on which the resultant force of an engine vibromotive force acts than to a position where the amplitude of a bending vibration mode becomes wide. CONSTITUTION:A toothed belt 14 is wound between a toothed pulley 12 which is provided on the output shaft 5 of an engine and a pulley 13 which is provided on a camshaft 18, and a pulley 15 provided with a balancer 11a is rotated integrally via the toothed belt. And a gear 16 is mounted to the pulley 15, and is engaged with the gear 17 of a pulley 22 provided with a balancer 11b, so that the respective balancers 11a, 11b are rotated reversely. These balancers 11a, 11b are rotated at a same speed that is twice as fast as the output shaft 5, and the resultant force of centrifugal forces generated by the rotations of both balancers becomes the vibromotive force of the balancers. As the installing positions of the balancers to the pulleys are made variable, the vibromotive force can be made bigger in case of mounting auxiliary machinery. Thus, the addition or the reduction of the auxiliary machinery can be dealt with, and simultaneously bending vibrations can be reduced. |
