Coupling Element & Sizing ® TRASCO Jaw Couplings 3 www.jbj.co.uk/couplings.html #DriveLineHarmony In case of drives with high torsional vibrations (e.g. piston compressors, combustion engine) it is recommended to undertake torsional vibration calculations in order to guarantee the correct functioning of the coupling. Please consult the jbj Techniques Limited technical office, telephone: +44 (0)1737 767493 or email: info@jbj.co.uk Shock load safety factor Shock load type SU Light 1.4 Medium 1.5 Hard 1.8 Temperature safety factor T (°C) –30 °C/+30 °C +40 °C +60 °C +80 °C S 1 1.2 1.4 1.8 θ Safety factor for frequency of starting Starts/h 0 - 100 101 - 200 201 - 400 401 - 800 SZ 1 1.2 1.4 1.6 Hub Shaft Connection Check Hub shaft connection must always be checked by the user. It is important to verify the maximum torque in the drive is lower than the torque which the hub shaft connection can bear. In case of keyway connection, it is important to verify the tensile strength of the hub material with the load which the keyway seat must transmit. T : Coupling nominal torque (Nm) KN T : Coupling maximum torque (Nm) Kmax T : Torque with reversal transmissible by the coupling (Nm) KW T : Motor nominal torque (Nm) N T : Motor peak torque (Nm) S T : Torque with reversal of the machine (Nm) W S : Temperature factor θ S : Start frequency factor Z S : Motor or driven-side shock factor u P : Motor nominal torque (kW) N n: rpm min-1 Type of stress TN TW Periodic Harmonic TN 2TW
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