CSF CSG PDF - Harmonic Drive LLC

Output Bearing RatingsHow to Calculate the Maximum Load MomentHow to calculate the Maximum load moment is shown below. Please be sure that Mc is equal or greater than M max.Mmax = Frmax • (Lr+R) + Famax • LaFrmax Max. radial load N Figure 7Famax Max. axial load N Figure 7Lr, La Moment arm m Figure 6R amount of offset m Table 30How to Calculate an Average LoadTo calculate average radial load, average axial load oraverage output speed, follow steps below.When the radial load and axial load vary,the life of cross roller bearing can be determinedby converting to an average load. (see figure 7)LoadFigure 6Supportequation (11) Calculate Average Radial LoadRadial LoadFrdpFrav =10/3n1t1|Fr1| 10/3 + n2t2|Fr2| 10/3··· + nntn|Frn| 10/3n1t1+ n2t2··· + nntnHowever Max. radial load in t1is Fr1, Max. radial load in t3 is Fr3.LaAxial Loadequation (12)Calculate Average Axial Load(Faav)FaLrR10/3n1t1|Fa1| 10/3 + n2t2|Fa2| 10/3··· + nntn|Fan| 10/3Faav =n1t1+ n2t2··· + nntnHowever, an axial load in t1 is Fa1, Max. axial load in t3 is Fa3.equation (13)Calculate Average Output SpeedFigure 7Nav = n 1t 1 + n2t 2 ... + nnt nt 1t 2 ... + tnFr1How to calculate radial load coefficient (X) axial load (Y)Xlist 2YRadialLoadFr2timeFaavFrav+2 (Frav (Lr+R) + Faav.La) /dp< =1.5 1 0.45Fr3Fa1FaavFrav+2 (Frav (Lr+R) + Faav.La) /dp> 1.5 0.67 0.67AxialLoadFa2timeFa3t1 t2 t3Frmax Max. radial load N Figure 7Famax Max. axial load N Figure 7rpm(Output)n1n2n3timeLr, La Moment arm m Figure 6R amount of offset m Table 30dp pitch circle m Table 3034