The ball screw uses the circular ball bearing to reduce the friction and improve the efficiency. The trapezoidal screw uses the low friction coefficient between the sliding surfaces. Therefore, trapezoidal screw is usually not as efficient as ball screw.

分析摩擦学机制就能够发现：滑动摩擦的可预测性低于采用循-环滚珠技数的传动。疲劳寿命方程在其适用范围内可靠。

By analyzing the mechanism of tribology, it can be found that the predictability of sliding friction is lower than that of the transmission with circular ball technology. The fatigue life equation is reliable in its application range.

综合以上，就可以知道滚珠丝杠和梯形丝杆是因为预测性能和寿命的能力有所差异，所以在应用领域也有很大的区别。

Based on the above, we can know that ball screw and trapezoidal screw are different in their ability to predict performance and life, so they are also very different in the application field.

虽然滚珠丝杠有着较多的优势，但是成本比较高。

Although ball screw has many advantages, but the cost is relatively high.

虽然和其它平移直线运动方案相比来说，它们的性价比很高，但是因为滚珠丝杠的设计比之复杂，需要经过-硬化处理的精密轴承表面以及一个滚珠循-环装置。

Although compared with other translational linear motion schemes, their cost performance is very high, but because the design of ball screw is more complex, it needs a precision bearing surface after hardening treatment and a ball circulation device.

而梯形丝杆的尺寸很小，设计起来很灵活，在正常使用的情况下噪音很小，耐腐蚀性能好，可以为了满-足垂直应用需求而配置自锁功能。它们在很多应用领域发挥着重要作用，当然本身也有一些限制。

The trapezoidal screw has small size, flexible design, low noise and good corrosion resistance in normal use. It can be configured with self-locking function to meet the requirements of vertical application. They play an important role in many application fields, but they also have some limitations.

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