As we all know, the ball screw can really achieve self-locking, however, this self-locking is usually achieved through external input, not through its own mechanical characteristics. The application of ball screw in real life and production faces various problems that need us to solve one by one. So, what is the reason why the ball screw can't lock itself?
● Friction angle and helix angle: The friction angle of the ball screw is smaller than the helix angle, which means that the friction generated when the ball rolls on the screw cannot overcome the helix angle of the screw, so the self-locking effect cannot be generated.
● Transmission efficiency: The transmission efficiency of the ball screw is very high, which means that a complete rotation can be completed in a short time. Therefore, when the external torque disappears, the internal friction can't make the ball stay on the screw for a long time, which leads to the failure of self-locking.
Ball screw can't self-lock because of its high transmission efficiency, friction angle less than screw angle and other factors. Because ball screw can't self-lock, servo motor must be used to hold the brake or load the brake device when it is placed vertically to prevent the weight from reversing, so as to prevent the equipment from being dangerous when it is powered off or stopped.
The transmission efficiency of ball screw is about 90~96%, and that of common screw is about 26~46%. That is, if the same large load is driven, the ball screw can use less driving power, which can reduce the cost and energy consumption.
Ball screw is mainly used to transmit rotary motion and torque, rather than self-locking function. Therefore, in practical application, it is necessary to select suitable transmission components according to specific working conditions and requirements. If self-locking function is needed, other transmission modes such as worm gear transmission can be selected. Please contact us if you have other questions or purchase requirements.
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