Couplings (shaft joints) are mechanical elements that connect the drive shaft and driven shaft of a motor, etc., and transmit power. If the coupling has flexibility, the eccentricity between the two shafts (error adjustment) can be tolerated, and the failure caused by the uneven wear of the bearing and the error adjustment of the device vibration, etc. can be reduced.
The main function of the coupling is to connect the drive shaft of a motor, etc., and the driven shaft of a ball screw, etc., and transmit power. The installation error of the shaft center of the drive shaft and the driven shaft is allowable. Absorbs the shock and vibration of the device.
Improve device performance.
1. The biggest function of connecting the drive shaft and the driven shaft and transmitting the power coupling is to connect the drive shaft such as the motor and the driven shaft such as the ball screw, and transmit the power of the motor to the driven shaft. There are many ways to connect with the shaft, such as the "fixed screw type" that directly presses the screw on the shaft, the "clamping type" that uses frictional force to connect, and the "expansion sleeve type" that uses the wedge effect.
2. The installation error of the shaft center of the drive shaft and the driven shaft is allowable. The misalignment of the drive shaft and the driven shaft is called error. There are three types of errors: eccentricity, declination, and axial deviation (axis direction deviation). These may cause vibration, noise, uneven bearing wear, etc. to cause device failure, so it should be minimized as much as possible.
However, it is very difficult to control the error adjustment to zero when assembling the device. Couplings have the function of allowing tolerance adjustments that cannot be fully adjusted during assembly.