Performance and Characteristics of Ball Screw Transmission Mechanism

The ball screw is composed of a lead screw, a nut, a steel ball, a pre-compression sheet, a reverser and a dust-proof device. It is an ideal product for converting rotary motion into linear motion, or converting linear motion into rotary motion. When the ball screw is used as the active body, the nut is converted into linear motion according to the corresponding standard lead according to the rotation angle of the screw shaft. The passive workpiece is connected with the nut base and the nut to realize the corresponding linear motion. Then, let's learn about the ball screw transmission together. The performance and characteristics of the mechanism!

There are two common circulation modes: external circulation and internal circulation. The material that is not in contact with the lead screw is called the lateral circulation. Outside circulation means that after the end of the circulation process, the ball enters the circulation through the spiral groove or cannula on the outer side of the nut and returns to the nut. The external circulation structure and manufacturing technology of the external circulation ball screw are simple and widely used. The material that often comes into contact with the lead screw is called internal circulation. The internal circulation adopts reverse to realize ball circulation.

Performance of screw drive mechanism

Compared with the auxiliary sliding screw, the driving torque of the screw rod is 1/3. There are many balls rolling motion between the screw shaft and the screw nut of the ball screw pair, so high motion efficiency can be obtained. Compared with the conventional sliding screw pair, the driving torque is 1/3 or less, that is, the power required to achieve the same movement result is 1/3 of the used rolling screw pair. Useful in terms of power saving.

High transmission efficiency

The transmission efficiency of the ball screw pair is as high as 90% ~ 98%, which is 2~4 times that of the sliding screw pair. The torque can be converted into thrust, and the thrust can also be converted into torque.

Sensitive and smooth transmission

The ball screw is a point contact rolling friction, with low friction resistance, good sensitivity, no jitter when starting, no creep at low speed, and micro feed can be controlled by step.

High positioning accuracy

The temperature rise in the ball screw sub-drive is small, the axial play and an elastic deformation can be preloaded, and the screw can be prestretched in order to compensate for the thermal elongation, so that higher positioning accuracy and repeated positioning accuracy can be obtained.

Good accuracy

The hardness of the ball and raceway reaches HRC58 ~ 63, the shape of the raceway is accurate, the rolling friction and wear are extremely small, and the precision retention, reliability and life are good.

High transmission rigidity

The internal and external tracks of the ball screw are two arc surfaces with eccentric rotation angle, which can be flexibly transmitted even when the track gap is extremely small. After applying a certain preload as required, the axial play and an elastic deformation can be eliminated to obtain good rigidity (in this case, the life will be reduced).

Good synchronization performance

The ball screw pair has the characteristics of high lead accuracy and good sensitivity, so in the case of synchronous transmission, good synchronization performance can be obtained by using several sets of ball screw pairs with the same lead. No gap, high rigidity. The ball screw pair can apply pre-pressure, and the axial gap is made negative by pre-pressure, and high rigidity is obtained (by applying pressure to the ball in the ball screw, when actually used in mechanical devices, etc., the repulsion of the ball will increase the line The rigidity of the female part. High-speed feed ball screw movement efficiency, heat is small, so you can high-speed feed (movement). The ball screw pair can improve wear resistance and transmission efficiency through lubrication. There are two kinds of lubricants: lubricating oil and grease. Lubricating oil uses 90~180 kinds of turbine oil or 140 kinds of spindle oil. Lithium grease can be used as the grease. The grease is put into the shell space where the threaded track and the nut are installed, and the lubricating oil is injected into the nut space through the oil hole of the shell.

The above introduction is the performance and characteristics of the ball screw transmission mechanism. If you need to know more, please feel free to contact us!