www.jbj.co.uk/couplings.html#flender Sipex Series General Information Backlash Free Couplings 6 #DriveLineHarmony Dimensioning according to torque CouplingDimensioning It must be ensured that the coupling is capable of safely transmitting peak torques that regularly occur at the drive or load end. The service factor is provided in order to calculate the deviation between the real coupling load and ideal load conditions: Peak torque T Nm Peak torque at the coupling. S Servomotors (machine tools) 1.5 - 2 Checking themaximum torsion angle T ≥ T × FB KN S Checking themaximumspeed For all load situations: The correct coupling size can be calculated more accurately on the basis of acceleration or deceleration torques because the peak torque at the coupling is reduced by the ratio between themoments of inertia on the drive and load ends: T ≥ T × FB or T × FB KN AS LS Name Formula Symbol Unit Explanation KOL Coupling overload torque T Nm Torque which can be transmitted very rarely as maximum torque by the coupling. If the application requires a maximum torsion angle of the coupling, the selected coupling size must be checked to ensure that it is sufficiently torsionally rigid for the application in question: Angular misalignment ΔK ° Angular misalignment of the coupling halves. w In the case of clamping connections without feather key, it must be ensured that the transmissible torque of the hub connection is greater than the peak torque at the coupling. Rough 2.5 - 4 Uniform 1.5 T = T x J or T = T x J S AS L S LS L J + J J + J A L A L p CTdyn The actual shaft misalignment must be less than the permitted shaft misalignment for all load situations. Rated coupling torque T Nm Torque which can be transmitted as static torque by the coupling over the period of use. KN j = 180 x TS n > n Kmax max Dimensioning according to acceleration torques Checking the permitted shaft misalignment Peak torque at drive end T Nm Peak torque during non-periodic torque surges at drive end. AS Torque characteristic of drive Service factor FB Non Uniform 2 Checking the shaft-hub connection Peak torque at load end T Nm Peak torque during non-periodic torque surges at load end. LS 2 Moment of inertia of drive end J kgm Sumof themoments of inertia at the drive end referred to the coupling speed. A 2 Moment of inertia of load end J kgm Sumof themoments of inertia at the load end referred to the coupling speed. L Torsion angle j ° Torsion angle of the coupling under torsional load. Torsional stiffness, dynamic C Nm/rad Dynamic torsional stiffness of the coupling. Tdyn Axial stiffness C N/mm Axial stiffness of the coupling. a Radial stiffness C N/mm Radial stiffness of the coupling. r Rated speed n rpm Coupling speed. N Axial misalignment ΔK mm Axial misalignment of the coupling halves. a Service factor FB Factor that expresses the real coupling load as a ratio of the nominal coupling load. Radial misalignment ΔK mm Radial misalignment of the coupling halves. r Maximum coupling speed n rpm Maximumpermissible coupling speed. Kmax
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