如上图中曲线关系可得，当台车刚好与星轮接触时，这时台车有个明显的减速过程；当前台车T1刚好与星轮开始脱离时（拨齿），这时后台车T2与星轮啮合，也就在这一时刻，台车端面之间的间隙开始形成，从而避免台车碰撞变形。

As shown in the curve relationship in the above figure, when the trolley just touches the star wheel, the trolley has an obvious deceleration process at this time; when the current trolley T1 just starts to disengage from the star wheel (gear setting), then the background car T2 It meshes with the star wheel, and at this moment, the gap between the end faces of the trolley begins to form, thereby avoiding collision and deformation of the trolley.