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平行轴齿轮付(即直齿轮付或斜齿轮付)的啮合,理论上讲其齿面是一条线接触。交叉轴齿轮付(即螺旋齿轮付)的啮合,其齿面是一个点接触。然而在齿轮受载后,其齿面的接触状况非线或点的接触,而是一条颇为宽阔的带形接触区或一个不小的椭圆面接触区(图1)。这条带形或椭圆面接触区在齿面上不同点,其宽度或其椭圆的面积大小不一。这条带形或椭圆面的接触区,直接涉及齿轮的接触强度,耐磨性以及齿轮制造工艺中的许多问题。接触区的形成是很复杂的,不是纯几何学问题。但关于接触区的几何分析,却能阐明齿轮加工中许多啮合理论问题。例如剃齿过程的若干问题,包括:1)为什么剃齿能提高齿轮的齿向精度?2)剃齿时的轴交角∑,为什么必须控制
Parallel shaft gear pay (that is, straight or helical gear pay) engagement, in theory, the tooth surface is a line contact. Cross shaft gear pay (that is, spiral gear pay) engagement, the tooth surface is a point contact. However, after the gear is loaded, the contact condition of the tooth flanks comes into contact with each other at a non-linear or point-like point, but rather a rather broad ribbon contact area or a small elliptical contact area (FIG. 1). This strip-shaped or oval contact area is different in the tooth surface, the width or the size of its oval. This ribbon or oval contact area is directly related to the contact strength of the gear, the wear resistance and many problems in the gear manufacturing process. The formation of contact zones is complicated, not purely geometric. However, the geometrical analysis of the contact zone shows many of the meshing problems in gear machining. For example, a number of problems with the shaving process include: 1) Why can shaving improve gear tooth accuracy? 2) Shaft angle Σ, why you must control