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(一)从现代齿轮谈起现代齿轮的牙齿曲线,普通一般多用渐伸线制,而不用摆线制。主要原因,是渐伸线的齿轮装置方便,中心距离可以变勤,不致影响它的传动速度的均衡性。另一方面(也是很重要的),就是制造刀具的简化;因为渐伸线的齿条是一根直线,渐伸线的螺旋体是用直线组成的曲面,而且是可展曲面。因此用样板刀铣齿的方法,非但笨拙(要画出曲线,用样板制造刀具),而且不准确(刀号有限,而齿形的变化无限)。所以在成批和大量生产中,都捨 用画圆的方法(用样板刀铣齿式的,也可称是“描摹法”)而改用创成方法,即用滚齿、铡齿、铇齿、磨齿的方法完成。一方面由于创成方法的出现,给齿轮的转位选形,提出了迫切的要求(否则齿数小的齿轮,要发生齿根切入),而且有完全可行的条件(用铣齿方
(A) from the modern gear talk about the modern gear tooth curve, the general general use more involute line system, instead of cycloid system. The main reason is that the involute gear device is convenient and the center distance can be changed to ground without affecting the balance of its transmission speed. On the other hand (and very important) is the simplification of tool making; because the involute wire rack is a straight line, the involute spiral is a curved surface made up of straight lines and is a developable surface. Therefore, the method of cutting the teeth with the model is not only clumsy (to draw the curve, use the model to make the tool), but also inaccurate (the tool is limited, but the change of the tooth shape is infinite). Therefore, in mass production and mass production, they all use the method of painting the circle (using the model knife-edge milling, also known as the “tracing method”) to create a method that uses hobbing, fangs, Tooth, grinding method to complete. On the one hand, due to the emergence of the creation method, an urgent requirement is placed on the indexing of the gears (otherwise the gear with the small number of teeth is to be incised), and there is a completely feasible condition