Timing Belts Catalogue

148Calculation ParametersCalculation ParametersCalculation ParametersStep e: Calculation/check of timing belt width w tbMoulded timing belt:Moulded belts are normally selected by the power they have totransmit:withwtb1000* P=t * PP mec...Mechanical power calculated in step 1 [W]t e...Engaged number of teeth 3,(max. 12 or 6 teeth) [-]P spec...Specific power of moulded belt from step 2(see respective catalogue page) [W/mm]Note: If moulded timing belts are dimensioned according toforce or torque, consult the table values of open length materialand multiply them with a factor of 0.8, (this considers thefact that moulded belts are approx. 20% weaker than openlength belts)Open length material, Torque belts, jointed beltsNote: If the belt width is limited and the width factor was usedin step 2: The following formulas require the calculated power/force/torque of step 1 (and NOT the corrected values)!specI. Calculation with mechanical power P mechemech[ mm]III. Calculation with force Fmitwtb=tF...Calculated force from step 1 [N]t e...Engaged number of teeth step 3(max. 12 or 6 teeth) [-]F spec...Specific tooth strength ofchosen belt from step 2[N/mm]; (see respectivecatalogue page)If the calculated belt width does notcorrespond to the standard width of thechosen belt (see respective cataloguepage), select the next larger width.Result step 5:F* FspecTiming belt width w tbe[ mm]wtbP=t * t1emech* Pspec[ mm]mitP mech...Calculated power from step 1 [W]t 1...Number of teeth of the smallest pulley from step 4 [-]te...Number of teeth engaged from step 4(max. 12 or 6 teeth) [-]P spec...Specific power of selected belt from step 2[W/mm]; (see respective catalogue page)II. Calculation with torque TwtbT * 100=t * t * T1espec[ mm]Copyright © Ammeraal Beltech 2006withT...Calculated torque from step 1 [Nm]t 1...Number of teeth of smallest pulley from step 4 [-]t e...Engaged number of teeth step 4(max. 12 or 6 teeth [-]T spec...Specific torque of chosen belt from step 2[Ncm/mm]; (see respective catalogue page)