Elastomer Couplings

Elastomeric couplings are key components that both transmits power and protects the more valuable coupling components from further damage. Elastomer refers to polymers with elastic properties that of rubber, capable suppressing vibrations during operations, tolerate potential misalignments, and  transmit Torque (the capacity to do work). Elastomers help accomodate misalignments or other possible errors — these behaviors can be categorized as compression and shear, and elastomers are even organized as such. Compression refers to different forces exerted into each other to the reduce the size of the material being affected. Shear force refers to different points where forces are exerted away from each other, similar to twisting. Example compression elastomers are the jaw (spider), donut, and pin & bushing elastomers, while shear typed elastomers range from tire, sleeve, and in-shear spiders.

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Elastomer Coupling Elements

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Advantages of Elastomeric couplings	Limitations of Elastomeric couplings
Torsionally soft No lubrication or maintenance Good vibration damping and shock absorbing qualities Field replaceable elastomers Usually less expensive than metallic couplings that have the same bore capacity Lower reactionary loads on bearings More misalignment allowable than most metallic types	Sensitive to chemicals and high temperatures Usually not torsionally stiff enough for positive displacement Larger in outside diameter than metallic coupling with same torque capacity (i.e. lower power density) Difficult to balance as an assembly Some types do not have good overload torque capacity