The principle and structure of ball screw

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

Structure of ball screw:

The traditional structure of ball screw pairs is divided into internal circulation structure,Represented by circular and elliptical invertersIntegrate with the external circulationconstructRepresented by intubationTwo types. These two structures are also the most commonly used structures. There is no essential difference in the performance between these two structures,Just the installation and connection size of the internal circulation structure is small; The installation and connection dimensions of the external circulation structure are large. At present, the structure of ball screw pairshave10There are various types, but the most commonly used ones are: internal circulation structure, external circulation structure, end cap structure, and cover plate structure.

Principle of ball screw:

1. According to the national standardGB/T17587.3-1998And application examples, ball screws (currently basically replacing trapezoidal screws,Commonly known as a screw, it is used to convert rotational motion into linear motion; Or the execution element that converts linear motion into rotational motionIt has high transmission efficiency and accurate positioning.

2. When the ball screw is used as the active body, the nut will convert according to the corresponding specifications of the lead according to the rotation angle of the screwIn linear motion, passive workpieces can be connected by nut seats and nuts to achieve corresponding linear motion.

Characteristics of ball screw:

1Compared with the sliding screw pair, the driving torque is1/3There are many balls rolling between the screw shaft and the nut of the ball screw,So it can achieve higher motion efficiency.With pastCompared to the driving torque, the sliding screw pair has reached1/3following,The power required to achieve the same motion result is the use of rollingThe screw pair1/3It is very helpful in terms of power saving.

2High precision guarantee

Ball screws are continuously produced using the world's highest level of mechanical equipment manufactured in Japan,Especially in research and developmentAssemblyCheck the factory environment of each process, Temperature·The humidity has been strictly controlled,Due to the well-established quality management systemThe accuracy is fully guaranteed.

3Micro feed may

Due to the use of ball motion, ball screws,So the starting torque is extremely small,There will be no crawling phenomenon like sliding motion,abilityEnsure precise micro feed.

4. No side clearance, high rigidity

Ball screw can apply pressure，Due to the fact that preloading can cause the axial clearance to reach a negative value,Thereby obtaining higher rigidityBall screwBy applying pressure to the ball bearings internally,When used in practical applications such as mechanical devices,Due to the repulsive force of the ball, the rigidity of the mother wire can be increasedstrong.

5. High speed feed may

Ball screw can achieve high-speed feed due to its high motion efficiency and low heat generationmotion.

◎ Precision tolerance:C10，C7，C5，C3，C2，C1...The smaller the number, the higher the accuracy.