Timing Belts Catalogue

140 Timing belt calculationTiming belt calculationStart12Calculation o f existing pow er,torque o r forceChoose Torque, mo ulded o r(jointed) open length ma terialPPmechmech11= F * v*= 2* π * n*T * = Pηη= PmotT = Tmot *(1,5÷ 2,5)*(c + c + c )*hsl[ Nm]1η[ W ]mot1* c*η[ W]( 1,05 1,15) [ ]F = ( m*(a + g *sin α + g *cosα*( µ oder fR))* ÷ NBelt w idt h is no t restri cted bythe c on stru ctionBelt w idt h is restr icted bythe c on stru ctionTiming belt calculation345Ch oose too thprof ile a nd pitchCh oose too thprof ile a nd pitchCalculation o f transmissionfactor/ numb ers o f teethCalculation o f beltwidthCheck b elt w idthtmotnnmachmoti = = [−] tmach= tmot* [ −]t nnmachmotmachPmechTwtb = [ mm]wtb =[ mm]t * t * Pt * t * T1especFw = [ mm]tbt * F: PmechWickel w[t * Pmm]tb=espec1eespecspec6Calculation o f centre-centredistancepCC =1 2π( 0 ,5...2)*( t + t ) [ mm]78Calculation o f belt lengthCheckforces, distance,(standard-) b elt length/pulleysltb,a=p* CD +22p ⎛ t − t ⎞⎜ ⎟CD ⎝ 2π ⎠2( t + t ) + [ mm]121 2⎛ β1⎞ p ⎡2* CD*sin⎜⎟ + * ⎢⎝ 2 ⎠ 2 ⎣β ⎞180°⎠1( t + t ) + 1−( t − t ) [ mm]ltb, c=1 2 ⎜ ⎟*2 1β1=⎛⎝( t2− t ) ⎤ [ ° ]⎡ p**arccos⎢⎣ 2* CD*π21⎥⎦⎥ ⎦⎤not o.k.o.k.Ordertiming b elts /pulleysCopyright © Ammeraal Beltech 2006