Firstly the calculation formula of power rating of trapezoidal toothed synchronizing belt drive system in the national standard GB/T 11362-2008 is introduced
secondly the formulae of maximum power rating Pmax and corresponding optimum belt velocity υopt are derived with rules in differential calculus
and then the optimum belt velocity and maximum power rating of seven types of trapezoidal toothed synchronizing belt drive system with different belt widths are calacuated when the coefficient of engagement tooth profile is 1