Structure and Characteristics of Diaphragm Coupling

Flexible Couplings

The diaphragm coupling is composed of at least one diaphragm and two shaft sleeves. The diaphragm is fastened to the sleeve with a pin and generally does not loosen or cause backlash between the diaphragm and the sleeve. Some manufacturers provide two diaphragms, and others provide three diaphragms, with one or two rigid elements in the middle, and the two sides are connected to the shaft sleeve. The difference between the single diaphragm coupling and the double diaphragm coupling is the ability to handle various deviations. In view of the complex bending of the diaphragm, the single diaphragm coupling is not suitable for eccentricity. The double diaphragm coupling can bend in different directions at the same time to compensate for eccentricity.

The characteristics of diaphragm couplings are a bit like bellows couplings. In fact, couplings transmit torque in 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 up to 1.5 degrees of deviation, while generating a lower bearing load in the servo system. Diaphragm couplings are often used in servo systems. Diaphragms have good torque rigidity, but are slightly inferior to bellows couplings. On the other hand, the diaphragm coupling is very delicate and can be easily damaged if it is misused in use or not installed correctly. Therefore, it is very necessary to ensure that the deviation is within the tolerance range of the normal operation of the coupling. Choosing the right coupling is a key step to make good use of the coupling. You have to consider what type of coupling to choose in the design stage.
Compared with the gear coupling, the diaphragm coupling has no relative sliding, no lubrication, sealing, no noise, basically no maintenance, easy to manufacture, and can partially replace the gear coupling.

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