3 www.jbj.co.uk/couplings.html #DriveLineHarmony T = T • m s AS A The torque transmissible by the coupling T must always be higher than the maximum torque applied to the driver and driven shaft. KN For applications with extreme precision requirements it could be important to verify the transmission error which is calculated as follows: For drives in machine tools k = 1,5 - 2 Verify shaft diameter. With: » axial misalignment: usually due to temperature variation. T = T • m s LS L k = 1,5 with uniform load. T = peak torque of driven side (Nm) LS Ts = acceleration torque (driver or driven side) k = 2,5 - 4 with peak or impact load. With C = torsional stiffness of the coupling (Nm/rad). T After having selected the coupling verify the required shaft diameters are compatible with the selected coupling size (F /F ). min max The nominal torque must be higher than the acceleration torque. » Δk , Δk , Δk respectively axial, radial, and angular misalignment which the coupling can bear. a r w k = service factor Being: T > T • k KN S T = peak torque of motor side (Nm) AS Coupling selection T ≥ k • T KN AS/LS Verify the torque to be transmitted. Verify acceleration torque. k = 2 with non-uniform load. With: Verify misalignment. Misalignment in the application must be compatible with the allowable misalignment of the coupling. It must be considered that the maximum values of misalignment of the coupling cannot be reached simultaneously. Given the values of misalignment of the application and converted in percentage with respect to the corresponding maximum values of the coupling, the percentage sum must not exceed 100%. » Δk M, Δk M, Δk M respectively axial, radial, and angular misalignment of the machine. a r w » angular misalignment: values up to 2° are acceptable. » radial misalignment: pay close attention not to exceed maximum radial misalignment. It could bring to bellows distortion. Verify hub transmissible torque. It is important to verify the torque required in the drive is compatible with the transmissible load of the hub-shaft connection. It is possible to deliver couplings with different clamping systems in case a special application is needed. Also it is possible to deliver couplings with minimum bore smaller than indicated in catalogue. In such a case, the hub shaft connection transmissible torque will be lower. Selection Criteria ® SERVOPLUS Bellows Couplings m = A J + J A L JA m = L J + J A L JL (°) b = p • CT 180 • TAS Dk Dk Dk aM rM wM • 100% + • 100% + • 100% < 100% Dk a Dkr Dkw
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