5 The focus of any coupling is the flexible elements; the working component . This is the part that must effectively absorb the shock loads, misalignment forces, torsional vibrations and the abuse of environmental conditions. It must be reliable, economical and not harmful to the connected equipment. It is virtually impossible for one single element material or coupling configuration to satisfy all these user requirements. That is why there are different materials used for flexible elements. Optimum and reliable performance is the result of the unique LF Torsional coupling design which permits easy adaptation and assembly to any application. Rubber (HTR) LF Torsional rubber elements are temperature resistant and are made from natural rubber (HTR). Natural rubber (HTR) elements have an operating range of -40 degrees C to 90 degrees C. The rubber element is torsionally soft and is placed into compression during asembly. Rubber in compression can transmit up to 5 times more torque as compared to non-compressed rubber. The rubber LF Torsional elements effectively accomodate shock, misalignment and vibration and do not exert any harmful radial and axial forces on the connected equipment. Available in High-Temperature Rubber (HTR) 50, 60, shore hardness as standard. Other materials and shore hardness grades are available for certain sizes. Please contact jbj Techniques Limited technical office telephone: 01737 767493 or email: info@ jbj.co.uk for higher temperature requirements. ® Hytrel Elements (HY) LF Torsional elements are made of a Hytrel ® elastomer compound from DuPont ™. These elements are torsionally much stiffer than natural rubber, about 20 times more so, and were developed for use primarily in combustion engine/hydraulic pump applications. These applications usually require reliable coupling performance in hot, oily environments. Hytrel® elements have 20% greater torque capacity compared to rubber elements and operate efficiently in the temperature range of -50°C to 120°C. The Torsional coupling with the Hytrel ® element places the harmful vibration resonance frequency above the operating speed range of the power package. The unique element design also reduces harmful axial reactionary f or ces . ® Zytel Elements (X) This element is extremely rugged and made of DuPont’s ™ highly stressable Zytel ® elastomeric compound. Zytel ® has excellent resistance to most chemical attacks and corrosion. Operational temperature range is -40° to 150°C without derating. This element composition is torsionally about three times stiffer than the Hytrel ® elements. Maximum angular misalignment is 1°. Zytel ® (X) elements exhibit less than 1° wind up at nominal torque and zero backlash. With more torque carrying capacity, compared to Hytrel ®, this element is particularly suited for applications where heat, moisture, high torque/high speed and corrosion resistance are important factors in coupling selection. TORSIONAL COUPLINGS LF TORSIONAL FLEXIBLE ELEMENTS #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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