１引言蜗杆传动时的受力分析，因其受蜗杆蜗轮两者之间的相互位置、螺旋线走向和旋转方向三因素的影响，使得在众多教材和图书资料中对其受力方向的判别尚无统一定式，只能根据其不同情况和条件进行推绎。因此，教师在讲解时尽管左、右手多次比照分析，但学生在理解上仍存... 1 Introduction Worm drive force analysis, because of the worm gear by the mutual position between the two, the direction of the spiral and the direction of rotation of the three factors, making a lot of teaching materials and books in the direction of its force is still discriminating No uniform format, only according to their different circumstances and conditions deduced. Therefore, although teachers make explanations on the left and the right despite repeated analysis, the students still exist in understanding ...