The focus of any coupling is the flexible elements, or the “working component”. The element must effectively absorb the shock loads, misalignment forces, and torsional vibrations, under a variety of environmental conditions. The following materials are used to accommodate the different conditions and environments where the couplings are used.
High Temperature Rubber (HTR)
There are two different rubber element materials available, High Temperature Rubber (HTR) and Neoprene (CR). Both elements are torsionally soft andare placed into compression during assembly. Rubber under compressioncan carry up to 5 times the amount of torque as non-compressed elements. The elements effectively accommodate shock, misalignment, and vibration plus minimize harmful radial and axial forces on the connected equipment. Neoprene (CR) is used in environments that are hostile to High Temperature Rubber (HTR).
Available Durometer Hardness : 50, 60, 70, 75 (Shore A scale)
Operating Temperature Range: HTR: -40° to 194° F; CR: -40° to 175° F
Maximum Angular Misalignment: Up to 3°
Elements made of DuPont’s Hytrel® elastomer compound are torsionally much stiffer than natural rubber (20 times stiffer) and were developed for combustion engine / hydraulic pump applications. Hytrel® elements have 20% greater torque capacity as compared to rubber elements. The torsionally stiff Hytrel® element moves the harmful vibration resonance frequency above the operating RPM range. The element design also reduces harmful radial and axial reactionary forces.
Operating Temperature Range: -60° to 250° F
Maximum Angular Misalignment: 0.25°
Elements made of DuPont’s highly stressable Zytel® elastomeric compound have excellent chemical compatibility and corrosion resistance. The element composition is 3-times stiffer then Hytrel® elements. Zytel® elements exhibit less than 1° wind up at normal torque and zero backlash. Most suited for applications where heat, moisture, high torque / high speed, and corrosion resistance are critical factors in the coupling selection.
Operating Temperature Range: -40° to 300° F
Maximum Angular Misalignment: 1°