螺旋伞齿轮的切齿计算公式是一系列近似计算的结果,现就主要部分分析其近似性如下:一、近似的条件螺旋伞齿轮的瞬时接触线是瞬时轴线在齿面上的垂直投影。这时,任一接触点的法线均通过瞬时轴,这是接触的必要条件。成对齿轮分别利用平面冠轮制造时,大齿轮和小齿轮与冠轮的瞬时接触线在同一锥距上应该互相吻合,亦即大、小齿轮和冠轮三者在任一瞬间获得共同的线接触。但是通常在切齿机上加工螺旋伞齿轮(非等高齿)时,由于用平顶齿轮代替了平面冠轮,于是加工大、小齿轮的两个冠轮无法完全吻合,因此大 Helical bevel gear cutting formula is a series of approximate calculation results, the main part of the analysis of the following are as follows: First, the approximate conditions Spiral bevel gear instantaneous contact line is the instantaneous axis of the vertical projection of the tooth surface. At this point, the normal of either point of contact passes through the instantaneous axis, which is a necessary condition for contact. When a pair of gears are respectively manufactured by using a flat crown wheel, the instantaneous contact lines between the large gear wheel and the pinion wheel and the crown wheel should be matched with each other on the same taper. That is, the large and small pinions and the crown wheel can obtain a common line at any moment contact. However, usually in the gear cutting machine spiral bevel gear (non-contour tooth), the flat crown gear instead of the plane crown, so the processing, the two crown gear pinion can not be completely matched, so large