Diaphragm coupling structure and use characteristics

The diaphragm coupling is formed by at least one diaphragm and two shaft sleeves. The diaphragm is fastened to the shaft sleeve with a pin, which generally does not loosen or may cause backlash between the diaphragm and the shaft sleeve. Some manufacturers supply two diaphragms, and some supply three diaphragms.

This characteristic of the diaphragm coupling is a bit like a bellows coupling. In fact, the couplings transmit torque in almost the same way. The diaphragm itself is very thin, so it is easy to bend when the relative displacement load is generated, so it can withstand a deviation of up to 1.5 degrees, while generating a lower bearing load in the servo system.

Diaphragm couplings are commonly used in servo systems. The diaphragms have good torque rigidity, but are slightly inferior to bellows couplings. And it is very delicate, it is easy to damage if it is misused or not installed correctly in use. Therefore, it is very necessary to ensure that the deviation is within the normal operating range of the coupling.

The initially selected bearing coupling dimensions, namely the shaft hole diameter d and length L, should meet the requirements of the shaft diameter of the driving end and the driven end. It is normal for the shaft diameters of the driving end and the driven end to be different. When the torque and speed are the same, and the shaft diameters of the driving end and the driven end are different, the coupling type should be selected according to the large shaft diameter.