Jaw coupling is one of the top general-purpose types of power transmission couplings that can also be applied in systems motion control operations. The coupling is designed to transfer torque while reducing vibrations and allowing for some misalignment. This is important for protecting other components of your system from damage. Most jaw couplings are designed with three main parts: an elastomer insert (element) and two metallic hubs
. The three parts are tightly fitted together with a jaw from every hub fitting alternately with lobes of the element. When using jaw coupling, torque is transmitted via elastomer lobes. The elastomer of jaw coupling can be made using varying materials. This is important to achieve different levels of vibrations reduction, operational temperature ranges, the capacity to handle misalignment, and chemical conditions. Depending on your application, you have the option of selecting jaw coupling with curved jaws or straight tooth jaw. The straight tooth jaw design helps elastomers get attached and removed radially. When the elastomer used in the coupling is stiffer, using the curved jaw design can assist you to achieve zero-backlash. It is important to note that like other types of couplings, the jaw couplings have limitation on the shaft misalignment they can accommodate. For example, too much axial motion can force the couplings to loosen and come apart. Besides, a lot of parallel misalignment can result in premature wearing.