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Bellows Couplings
Ruland bellows couplings, available thru Pacific International Bearing Sales, are ideal for high-performance servo and stepper motor applications requiring precise motion control. These zero-backlash couplings feature a balanced design and combine high torque capacity with excellent torsional stiffness, while accommodating angular, axial, and parallel misalignment. Constructed with lightweight anodized aluminum hubs and a flexible stainless steel bellows, they support speeds up to 10,000 RPM with minimal inertia. Available in clamp-style with or without keyways, in inch, metric, and mixed bore sizes from 1/8" to 1 3/4" and 3mm to 45mm.
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FREQUENTLY ASKED QUESTIONS
What is a bellows coupling?
A bellows coupling is a flexible, zero-backlash shaft coupling that uses a thin-wall metallic bellows between two hubs. The bellows transmits torque with very high torsional stiffness while allowing controlled angular, axial, and parallel misalignment.
When should I use a bellows coupling instead of other servo coupling types?
Choose a bellows coupling when you need the highest torsional stiffness and positioning accuracy, such as in servo and stepper motor drives, precision indexing systems, and high-resolution feedback devices. They are preferred over beam or jaw couplings when minimal wind-up and zero backlash are critical.
How much misalignment can a bellows coupling handle?
Bellows couplings are designed to accommodate angular, axial, and parallel misalignment within specified limits while maintaining constant velocity and low restoring forces. This protects bearings and helps maintain system accuracy at high speeds.
What speeds and torques can these couplings support?
With balanced construction and lightweight components, Ruland bellows couplings support speeds up to approximately 10,000 RPM while transmitting high torque for their size. Exact ratings depend on bore size and configuration and should be verified from the individual product data.
What materials and configurations are available?
These couplings use anodized aluminum hubs combined with a stainless steel bellows for a high strength-to-weight ratio and corrosion resistance. They are offered in clamp-style hubs with or without keyways, and in inch, metric, and mixed bore combinations from 1/8″ to 1-3/4″ and 3 mm to 45 mm.
Are bellows couplings suitable for reversing and dynamic loads?
Yes. Their zero-backlash design, high torsional stiffness, and fatigue-resistant stainless bellows make them well suited for applications with frequent starts, stops, and reversals, providing repeatable motion and long service life when sized correctly.
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