Ball screw couplings are often used to install between the servo motor (or stepper motor) and the ball screw, which belong to the scope of miniature couplings. The fixing method is determined according to the load of the use condition. The shaft end of the coupling is generally round. It is rare to have a taper with a crescent key, or a flat key, trimming and other methods. The screw coupling generally uses two hexagon sockets. To tighten the screw, it is recommended to mill two planes on the shaft, so that it is not easy to slip even when the load is heavy. Due to the precision of its use occasion, it must have special performance:
1. Zero clearance: The entire coupling is not allowed to have clearance during transmission, including forward clearance and return clearance;
2. High rigidity: that is, transmission hysteresis is not allowed, otherwise it will seriously affect the accuracy of ball screw transmission;
3. Low inertia: On the basis of ensuring the transmission strength, the weight of the ball screw coupling should be reduced as much as possible;
4. Flexibility: The precision linear guide coupling not only requires high rigidity, but also needs to absorb the deviation between the shaft and the shaft generated during the installation process;
a. Torx type ball screw coupling
·Plum-shaped ball screw special coupling has high flexibility and rigidity at the same time, and different hardness elastomers can be selected according to the requirements;
·Zero-clearance transmission, there is a great pressing force between the elastic body and the metal sleeve to ensure close contact between the two
·The shaft hole adopts a clamping structure to ensure that there is no gap between the shaft and the hole.
b. Couplings for diaphragm ball screws
·Single diaphragm structure and double diaphragm structure, among which double diaphragm is more flexible;
·Compared with other types of servo motor couplings, the rigidity is higher;
·Has good heat insulation performance;
·The shaft hole type is divided into two types: clamping type and expansion sleeve type, among which the expansion sleeve type can bear a larger moment of inertia.
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