汽车发动机的分电器传动机构几乎都采用圆柱螺旋齿轮传动,两轴线往往既不相交又不平行。由于轴孔的位置常处于发动机曲轴箱(或汽缸体)内,以致两轴中心距的测量极为困难,虽然可借专用机床加以保证,但一般总希望加工后能知道此中心距是否合格,以 Almost all of the car engine transmission drive mechanism using cylindrical helical gear drive, the two axes often do not intersect and not parallel. Since the position of the shaft hole is often located in the engine crankcase (or cylinder block), the measurement of the two-axis center distance is extremely difficult. Although it can be guaranteed by a dedicated machine tool, it is generally desirable to know whether the center distance is acceptable after machining