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CLUTCHES, BRAKES & COUPLINGS
why jaw couplings aRe the smaRt choice foR seRvo-dRiven systems
In servo-driven systems, jaw couplings play a crucial role in achieving accurate and precise motion control. Here, Ruland looks into the reasons why designers should consider specifying these components in their designs
Balanced, zero-Backlash design
Jaw couplings are a three-piece assembly comprised of two jaw coupling hubs that press fit onto a jaw coupling spider. The press fit concentrates forces to the centre of the spider’s limbs and allows the coupling to operate with zero-backlash. These couplings are commonly used in
servo-driven systems with high acceleration and deceleration curves, where precise motion
control is required and the low inertia balanced design is desired.
elastomer spiders Spiders are available in three durometers, allowing the user to find the right balance of stiffness and compliance in their application. The advanced polyurethane material allows the spider to absorb shock loads without damage to the motor or other sensitive system components. They serve as the wear element
FEATURE
in jaw couplings and make for an inexpensive, simple replacement compared to other styles of coupling that require complete replacement at the end of their useable life.
high customisaBility Hubs with the same outer diameter can be mixed and matched and are manufactured in clamp or set screw styles. They can have inch, metric, keyed, or keyless bores. A selection of three elastomer spiders triples the potential combinations, giving designers a variety of ways to optimise their system. An additional benefit of the three-piece design allows for blind assembly in systems with limited shaft access.
huB separation Jaw couplings from Ruland are designed to accommodate all forms of misalignment with proper spacing between both hubs. Stand-offs on the spider limbs maintain proper spacing between the two hubs during installation, ensuring full misalignment capabilities. As the connecting element, the elastomer spider also interrupts electrical currents, making jaw couplings electrically isolating.
Fail saFe design If the spider fails or is otherwise compromised, the jaws of the hubs interlock for direct power transmission, allowing the machine to be shut down safely. When this type of failure occurs, the spider can be replaced allowing full coupling performance to be restored. Systems that would otherwise suffer damage
Zero-backlash jaw couplings from
Ruland are available with spiders in three hardness levels
and bore sizes from 3mm to 45mm
from sudden coupling failure benefit greatly from the continued functionality, and the sound of the hubs interlocking will alert any nearby maintenance personnel.
Ruland manufacturing co.
www.ruland.com
acorn industrial services t: 0800 8766 441
www.acorn-ind.co.uk/ruland
https://www.ruland.com/servo-couplings/
jaw-couplings.html
www.designsolutionsmag.co.uk JULY/AUGUST 2026 design solutions 1971-2026 21
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