A-11MAKIACEType number selection calculation example 1 : When selected by input capacity.1)Selection specificationInput shaft rotation speedn1=1500rpmOutput shaft rotation speedn2=50rpm10 hours continuous operationMedium shock loadingActual input capacityPa=2.2kWAmbient temperature of the speed reducertr=30℃A 250mm diameter gear is installed to the outputshaft, and the overhang load acts outward 10mmfrom the center of the output shaft.2)Determination of the reduction ratioR=n1n2=150050=303)Equivalent input capacity calculationBased on the load coefficient table, Sf=1.25 isfound from 10-hour continuous operation andmedium shock loading. Pe=Sf・Pa=1.25×2.2=2.75kW4)Provisional type number selectionFrom the performance table, first we temporarilyselect the MA100-30, which is the type thatallows 2.75 kW of input.5)Thermal rating capacity check(1)Heat-transfer coefficientαk=29W/m2・℃(2)Upper limit lubricant temperaturete=95℃(3)Ambient temperature of the speed reducertr=30℃(from the specification)(4)Speed reducer efficiencyη=84.3%(from theMA100-30 performance table)(5)Surface area of the gear caseSk=0.2658m2(from the surface-area table)Pw=Sk・αK・(te-tr)10・(100-η)=0.2658×29×(95-30)10×(100-84.3)≒3.20kWSince Pe=2.75kW, PW≧Pe This is OK.6)Overhang load check(1)The equivalent output torque is foundTe=974・Pe・η・9.8100・n2=974×2.75×84.3×9.8100×50=442.6N・m(2)Actual overhang load calculatuonLr=Te・forHere, the radius (r) of the gear = 0.125=442.6×1.25(fo=1.25, from the OHL coefficient table)0.125=4426N(3)Then, the equivalent allowable overhang load is foundFrom the specification where the overhangload acts outward from the center of theoutput shaft,Le=Lc・RR+RxFrom the allowable OHL tableLc=11760NR=89.9㎜Rx=10㎜Le=11760× 89.989.9+10=10583NSsince Lr=4426N , Le≧Lr isOK.According to the calculation above, theMA100-30 can be used..Type number selection