Ruland manufactures zero-backlash jaw couplings with bore sizes ranging from 1/8” to 1-1/8” and 3mm to 30mm. Jaw couplings feature a highly customizable three-piece design, have low inertia, and are well suited for applications that require dampening in industries such as semiconductor, solar, machine vision, liquid handling, and medical.
The three-piece balanced design consists of two aluminum hubs and an elastomeric element called “the spider,” which creates a low inertia coupling capable of speeds up to 8,000 RPM. Jaw couplings allow inch and metric hubs (set screw, clamp style, keyed, and keyless) to be easily combined forming a single coupling. Users can tailor the performance of jaw couplings to match their application needs as spiders are available in three durometers, 85 Shore A for greatest dampening, 92 Shore A for balance of dampening and torsional stiffness, and 98 Shore A for a small amount of dampening and highest torsional stiffness.
Ruland jaw couplings undergo a proprietary hub machining process to produce a curved jaw profile that press fits with the spider, assuring zero-backlash operation. The curved jaw profile concentrates the forces to the center of the spider’s limbs, improving the effectiveness of the elastomer material. Jaw couplings are considered fail safe because if the spider were to fail, the jaws of the two hubs interlock for direct power transmission, allowing the application to be safely shut down for maintenance.
Made of an advanced polyurethane material, the spider dampens impulse loads while minimizing shock to the motor and other sensitive equipment. Stand offs on the spider limbs help installers maintain proper spacing between the two hubs, assuring electrical isolation and full angular misalignment capabilities. Spiders are designed to be the wear element of the coupling making replacement cost effective and simple while restoring full performance abilities to the coupling.
Special designs such as stainless steel hubs, multiple set screws, and custom bore size and geometry are available by request. All Ruland products are RoHS2 and REACH compliant.
Learn more about how to choose servo couplings for your particular application from a Ruland expert. Read “What to Look for in a Servo Coupling” written by William Hewitson, Vice President of Operations.