One form of flexible coupling with very low and near zero-backlash is the bellows coupling. The key benefits of bellows couplings include misalignment compensation and precise transmission of velocity, angular positioning and torque. Bellows couplings are known for their exceptional torsional rigidity, which allows for flexibility in dealing with axial, angular and parallel shaft misalignment.

Bellows couplings are typically made from a stainless steel tube hydroformed to create deep corrugations that make them flexible across axial, angular, and parallel shaft misalignments. The bellows absorbs any slight misalignments between the mounting surfaces of two components.

When coupling shafts, bellows couplings absorb slight misalignments from perpendicularity and concentricity tolerances between the mounting surfaces of the two connected components. Bellows couplings tend to have the highest torsional stiffness of any servo motor coupling, and so are used in applications requiring high precision positioning.

Selecting the right bellows coupling for an application starts with knowing the torque involved. For instance, it’s helpful to know the peak torque capacity of the servo motor. This value, multiplied by the gear reduction ratio and a safety factor of 1.5, gives the minimal torque calculation.

In most cases, couplings are rated according to the maximum peak torque to be transmitted. The peak torque should not exceed the coupling’s rated torque. And by rated torque is meant the torque that is continuously transmittable within the specified acceptable speed and misalignment ranges.


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