The coupling must be chosen so the applied working loads do not exceed the allowable values whatever the working conditions are. 1. Check the load with respect to the nominal torque. The nominal coupling torque must be greater than or equal to the nominal torque of the drive machine for all working temperatures. T ≥T•S•S KN K q D 2. Check the load with respect to the torque peak values. The maximum coupling torque must be greater than or equal to the torque peaks that occur during operation for all working temperatures. T ≥T•S•S+T•S•S Kmax S Z q K q D (1) (1) Motor-side peaks: T = T • 1 • S + T Driven-side peaks: T = T • m • S + T S AS A L S LS L L m + 1 m + 1 3. Check the load with respect to periodic torque inversions. By means of resonance. When the resonance frequency is passed rapidly below the operational interval a few torque peaks will be seen. The generated alternating loads must be compared with the maximum torque the coupling can support. T ≥T•S•S+T•S•S Kmax S Z q K q D (1) (1) Motor-side peaks: T = T • 1 • V + T Driven-side peaks: T = T • m • V + T S AI R L S LI R L m + 1 m + 1 4. Check the load with respect to nonperiodic torque inversions. To check the load with respect to nonperiodic torque inversions, the following equations must be satisfied: 0.25 T = T ≥ T • S • S • S KN KW W q f D Motor-side peaks: T = T • 1 • V Driven-side peaks: T = T • m • V W AI fi W LI fi m + 1 m + 1 (1) TL to be added if a torque peak occurs during acceleration. Calculation coefficients Selection in Accordance with DIN 740.2 ® TRASCO ES Zero Backlash Jaw Couplings 5 www.jbj.co.uk/couplings.html #DriveLineHarmony
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