半创成传动中小齿轮的切削法　互相啮合的两齿轮,其中较大一只齿齿轮(即大齿轮)的齿形用直线代替普通曲线做成的,称做半以传动。 用直线代替曲线的齿形是这样实施的:限定新齿形的直线与曲线齿形相切,其切点即为曲线齿形与母圆的交点。由此可见,新的齿形和旧的齿形相比,在母圆两 Half of the transmission into the gear meshing two gears, one of the larger gear (ie gear) tooth shape instead of using a straight line made of ordinary curve, called half to drive. The straight line instead of the curve is implemented as follows: The straight line defining the new tooth shape is tangent to the curved tooth shape, the tangent point of which is the intersection of the curved tooth shape and the parent circle. Thus, the new tooth profile compared with the old tooth, two in the mother circle