差动螺旋传动是《机械基础》这门课程的难点,它是对口单招考试中年年出现的基本题。在教学实践中,学生较难理解“差动”的含义,特别是在计算上和方向的判断上有一定困难。用物理中的知识再结合实践能更好地排除学生学习中的障碍。 Differential spiral transmission is a “mechanical basis” of the difficulty of this course, it is a single examination of middle-aged single exam appears the basic problem. In teaching practice, students are more difficult to understand the meaning of “differential ”, especially in the calculation and direction of certain difficulties. Using physical knowledge combined with practice can better rule out obstacles in student learning.