5 #DriveLineHarmony Rupex Series Introduction Torsionally Flexible Couplings The values stated in the previous table on page 4 apply to a capacity utilization of 50 %, an excitation amplitude of 10 %TKN with the frequency 10 Hz and an ambient temperature of 20 °C. The dynamic torsional stiffness is load-dependent and increases in proportion to capacity utilization. The following table shows the correction factors for different rated loads. 500 1000 1500 3000 Torsional stiffness and damping is further dependent on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request. Torsional Stiffness andDamping C = CT 50% • FKC Tdyn dyn Load TN / TKN Correction factor FKC 65/80/90 ShoreA 0.51 0.83 1 1.18 1.38 1.58 1.8 2.03 The damping coefficient is Ψ = 1.4 ΔK =ΔK ⋅ FKV perm 1500 20% 40% 50% 60% 70% 80% 90% 100% Speed in rpm With flexible couplings the manufacturing process of the rubber elements and their aging primarily influence the stiffness value CTdyn. For this reason calculation must be made with a tolerance for the dynamic stiffness of ± 20 %. The specified damping coefficient Ψ is a minimum value with the result that the damping performance of the coupling corresponds at least to the specified value. Permitted shaft misalignment The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The correction factors for different speeds are specified in the following table. Themaximum speed for the respective coupling size and typemust be noted! Correction factor FKV 170 120 100 70 For fitting, themaximumgap dimension of Smax. = S + ΔS and theminimumgap dimension of Smin. = S – ΔS are permitted. Shaft misalignments ΔK and ΔK may occur simultaneously. r w www.jbj.co.uk/couplings.html#flender
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