Introduction ® TRASCO ES Zero Backlash Jaw Couplings Operation When the coupling element is installed in its special seats between the hubs, it becomes precompressed, thereby providing the zero backlash feature which characterizes the transmission performance of this coupling. With zero backlash, the coupling remains torsionally rigid within the range of the precompression load, but does permit the absorption of radial, angular, and axial misalignments as well as undesired vibrations. The significantly wide precompressed area of the flexible element keeps the contact pressure against the elastic element low. Therefore, the element teeth can be overloaded many times without undergoing any wear or taking a permanent set. Advantages ® The TRASCO ES coupling provides the following advantages: » “zero-backlash” motion transmission. » dampening (up to 80%) of vibrations from motor shaft. » low heat and electrical conductivity. » easy and fast installation. » perfect balance (A & AP type). » low moment of inertia (due to compact design and types of materials used). Main applications ® TRASCO ES couplings are most frequently used with: » servomotors. » robotics. » sliding tables. » spindle controls for drilling and grinding mandrels. » ball-bearing screws. Operating Temperature Range ® The operating temperature range for the TRASCO ES depends on the type of element. For the 92° Sh. A (yellow), the range is between -40 and +90°C, and for the 98° Sh.A (red), the range is between -30 and +90°C. Peak temperatures as high as 120°C can be tolerated for brief instances. High operating temperatures can cause the elastic element to lose a considerable amount of elasticity, thus substantially lowering the torque handling capacity. Therefore, when selecting a coupling, the operating temperature must be carefully considered (see “ on page 3”). Technical characteristics ATEX Directive 2014/34/EU ® It is possible to ask for specific certification for use in hazardous area according to EC standard 94/9/EC. TRASCO ES couplings are available with specific mounting/operating instruction manual and conformity. For further information, please contact jbj Techniques Limited technical office telephone: +44(0)1737 767493 or email: info@jbj.co.uk T (°C) Torsion angle (rad) 2 www.jbj.co.uk/couplings.html #DriveLineHarmony
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