一台运转很平稳的195型柴油机,因飞轮上的键槽坏了,在飞轮上离旧键槽180°位置又开了一道同样尺寸的键槽,安装试车后,突然发现机器跳动很厉害。原来,在装配新机时,飞轮和曲轴都做了平衡试验,如果只改动飞轮键槽,不改曲轴键槽,装上后则破坏了原来的动平衡。后来,将曲轴上离原键槽180°的位置相应开了新键槽,再试车,机器就很平稳了。 A very smooth operation of the 195 diesel engine due to the broken keyway on the flywheel, the flywheel away from the old keyway 180 ° position and opened a keyway of the same size, installation test, suddenly found that the machine beating very powerful. It turned out that the assembly of new aircraft, the flywheel and crankshaft have done a balance test, if only to change the flywheel keyway, do not change the crankshaft keyway, installed on the destruction of the original dynamic balance. Later, the crankshaft from the original keyway 180 ° position corresponding to open a new keyway, and then test the car, the machine is very stable.