①In design and production, we want to keep the radial deviation close to . The device generally uses a single diaphragm (short type) coupling. However, this is actually an important reason for the failure. Even if you are confident about the installation accuracy, it is still recommended to use a double diaphragm (long type) coupling for servo machinery.

Compared with a double diaphragm, the radial rigidity of a single diaphragm is 10 to 20 times that of a single diaphragm. Even if the deviation is only about 0.05 (mm), it will suffer a large deviation load. Even if the coupling is in a short time Internal damage will also shorten the life of the bearing. In severe cases, the shaft may be damaged. In addition, when a failure occurs, it cannot be replaced with a double diaphragm due to the assembly space. As a countermeasure, a polyimide (PI) diaphragm with low radial rigidity or a cross slide coupling compatible with a servo system must be selected.

② When the radial deviation cannot be controlled to a small extent, a double diaphragm (long type) coupling must be selected. Even so, it is still necessary to try to control it to less than the allowable value of the specification. When the allowable value has been reached, the rated torque must be reduced by 1/2 to 1/5. The impact of radial deviation on life must be considered. The damage in this case is almost always fatigue damage caused by the bending stress of the diaphragm.

③In order not to worry about the service life, you can choose fatigue-resistant polyimide (PI) or carbon fiber diaphragm, but the rated torque will be smaller.