Comparing Bellows Servo Couplings to Elastomer Servo Couplings

Elastomer? Bellows? What is the best coupling technology for your motion control application? Each has its advantages, from torsional stiffness to vibration dampening. A quick comparison of features and advantages can point to the best solution.

Servo Coupling Design

There are two basic types of servo couplings: bellows and elastomer. Both provide zero-backlash, low inertia, and compensation for shaft misalignment. Their difference lies in the flexible, compensating element.

Bellows Servo Couplings

The bellows coupling uses stainless steel bellows connected to the clamping hubs via a press fit brass wire, providing zero-backlash and extremely high torsional stiffness.

High torsionally stiffness
Temperatures to 300°C
Torque capacity up to 4000 Nm
Suitable for all motion control applications

Elastomer Servo Couplings

The elastomer coupling uses an elastomer “spider.” The spider and the clamping hubs interlock with involute teeth, providing zero-backlash and vibration dampening.

Vibration/resonance dampening
Temperatures to 120°C
Torque capacity up to 2000 Nm
Lower cost for less precise applications
Plug-in assembly
Electrically insulating

Use Elastomer Couplings for these Applications/Needs:	Use Bellows Couplings for these Applications/Needs:
Ability to repair Vibration/resonance dampening Continuous duty cycle Electrical insulation Low-cost solution	Cyclic duty cycle High speed High torque capacity High torsional stiffness No maintenance Extreme temperature range