Ball Screw

Ball Screw

Ball screws are ideal for converting rotary motion into linear motion or converting linear motion into rotary motion.

Ball screw is the most commonly used transmission component in tool machinery and precision machinery.

Its main function is to convert the rotary motion into linear motion, or to convert the torque into axial repetitive force, which is characterized by high precision, reversibility and high efficiency.

Ball screws are widely used in a variety of industrial equipment and precision instruments due to their low frictional resistance.

The ball screw is composed of screw, nut, steel ball, pre-compression piece, inverter, and dustproof device.

Its function is to convert the rotary motion into linear motion.

This is a further extension and development of Aikem screw.

The significance of this development is to change the bearing from sliding motion to rolling motion.

Working principle

The ball screw (which has basically replaced the trapezoidal screw, commonly known as the screw) is used to convert the rotary motion into a linear motion; or to convert the linear motion into a rotary motion.

It has the advantages of high transmission efficiency and accurate positioning.

When the ball screw is used as the active body, the nut will be converted into a linear motion according to the lead angle of the screw based on the rotation angle of the corresponding screw.

The passive workpiece can be connected through the nut seat and the nut to realize the corresponding linear motion.


  1. Low friction loss and high transmission efficiency

Since there are many balls between the screw shaft of the ball screw pair and the screw nut for rolling motion, high movement efficiency can be obtained.

Compared with the past sliding screw pair, the driving torque is less than 1/3, that is, the power required to achieve the same motion result is 1/3 of the sliding screw pair.

It is very helpful in saving electricity.

  1. High precision

Ball screw pairs are generally produced consistently with the world’s highest level of mechanical equipment.

In particular, in terms of the factory environment for grinding, assembling, and inspecting various processes, temperature and humidity are strictly controlled.

Due to the perfect quality management system, the accuracy is fully guaranteed.

  1. High-speed feed and micro-feeds possible

Since the ball screw pair uses the ball movement, the starting torque is extremely small, and there is no creep phenomenon such as sliding motion, and accurate micro feed can be ensured.

  1. High axial stiffness

The ball screw pair can be preloaded.

Since the pre-pressure can make the axial gap reach a negative value, a higher rigidity is obtained.

The inner side of the ball screws are pressurized by the balls.

When actually used for a mechanical device, the rigidity of the screw can be enhanced due to the repulsive force of the balls.

  1. Can not be self-locking, with the reversibility of the transmission

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