精密滚珠丝杠副，从字面上也很好理解，就是用滚珠来滚动，滚珠在哪里滚动，当然是在滚珠丝杠轴上滚动。

The precision ball screw pair is also easy to understand literally, which means using a ball to roll. Where the ball rolls, of course, it rolls on the ball screw shaft.

所以，丝杠轴上有圆弧轮廓，此轮廓在轴上按照一定的升角（导程角）盘旋在轴上。

So, there is a circular arc contour on the screw shaft, which rotates on the shaft at a certain rise angle (lead angle).

而滚球被设计在螺母里，在丝杠轴圆弧轮廓里滚动，所以是滚动摩擦。

And the rolling ball is designed in the nut, rolling in the arc contour of the screw shaft, so it is rolling friction.

其运动原理，就是螺旋副，简单理解，就是类似于拧螺钉，我们知道，拧螺钉时，如果在螺钉端部限制螺钉移动，那么被螺纹嵌入部件，就会沿着螺钉轴线移动。

The principle of motion is a spiral pair, which is similar to screwing in a screw. We know that when screwing in a screw, if the screw movement is restricted at the end of the screw, the embedded part of the thread will move along the screw axis.

滚珠丝杠，也是同样的道理，把丝杠轴一端或者两端沿轴向固定，用马达驱动丝杠旋转，那么，带钢球的螺母，就会沿丝杠轴线方向运动。

The same goes for ball screws. If one or both ends of the screw shaft are fixed axially and driven by a motor to rotate the screw, the nut with a steel ball will move along the screw axis.

梯形丝杠和滚珠丝杠的运动原理相同，不同之处在于，梯形丝杠里没有滚珠，那么螺母和丝杠轴之间的运动，完全靠机械接触产生滑动，是滑动摩擦，所以梯形丝杠也叫滑动丝杠。

The movement principle of trapezoidal screw and ball screw is the same, but the difference is that there is no ball in the trapezoidal screw. Therefore, the movement between the nut and the screw shaft is completely generated by mechanical contact, resulting in sliding friction. Therefore, trapezoidal screw is also called sliding screw.