Avoid sudden changes of the trajectory path underwater. 避免水下运动轨迹的突然改变。
By designing the negative shift for the sprocket, its trajectory coincides with the theoretical one, and the meshing quality is improved. 通过对链轮的负变位设计，使运动轨迹与理论轨迹重合，提高了啮合质量，并对啮合的重合度作了分析计算，对重合度的选择提供了依据。
