引用了一个含齿轮啮合传动的运动学习题，指出了原题解中的错误，并分别用几何法和解析法给出了问题的解，所得结果一致. 首次提出平面齿轮传动中节点加速度的一个重要性质：不管齿轮或齿条是作定轴转动还是作平面运动，节点的加速度在节点公切线方向的投影相等.

A kinematic problem on gear meshing transmission is introduced, and solved in detail by geometric and analytical methods. The errors in the original solution of the problem are pointed out. It is proposed that an important acceleration property of nodes in cylindrical gear transmission is that the projections of nodes’ acceleration on the direction of common tangent of nodes are equal whether the motion of the gear or rack is rotation about a fixed-axis or general planar motion.