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. Jaw couplings are commonly used in
servo-driven systems with high acceleration and deceleration curves, where precise motion control is required and a low inertia balanced design is desired.
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. These serve as the wear element in jaw
couplings and make for an inexpensive, simple replacement, when compared to other styles of coupling that require complete replacement at the end of their useable life.
Hubs with the same outer diameter can be mixed and matched. These are manufactured in clamp or set screw styles, and 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.
Ruland jaw couplings 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.
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 from sudden coupling failure benefit greatly from the continued functionality. Furthermore, the sound of the hubs interlocking will alert any nearby maintenance personnel.
Ruland zero-backlash jaw couplings are available in bore sizes from 3 mm to 45 mm, and with spiders in three hardness levels
Three-piece assembly:
Ruland curved jaw coupling with flexible spider insert
Ruland curved jaw coupling on shaft 37
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