5
Project Planning for Gear Units Overhung and axial loads
The permitted overhung loads must be calculated according the selection tables usingthe following formulae in the event that force is not applied at the center of the shaft end.The smaller of the two values F Important: only applies to gear units with input shaft assembly:Please contact SEW-EURODRIVE for off-center force application on the drive end. On the input side: Overhung load conversion for off-center force application On the output side: Overhung load conversion for off-center force application
xL xW (according to shaftstrength) is the permitted value for the overhung load at point x. Note that the calcula-tions apply to M
a max .
F
xL according to bear-ingservice lifeF
F= F ab + x[N]
xLRa• xW from theshaft strength:
F= cf + x[N]
xW F
Ra = Permitted overhung load (x = l/2) for foot-mounted gear units according to the selection tables in [N]x= Distance from the shaft shoulder to the force application point in [mm]a, b, f= Gear unit constant for overhung load conversion [mm]
c= Gear unit constant for overhung load conversion [mm]
xxF F F F
Ra X Ra xL d
d ll/2
02356BXX Figure 6: Overhung load F
x for off-center force application
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Catalog – DR Gearmotors 01/2008