Determining the overhung load

When determining the resulting overhung load, the type of transmission element mounted on the shaft end must be considered. The following transmission element factors fZ have to be considered for various transmission elements.

Transmission element

Transmission element factor fZ

Comments

Gear wheels

1.15

< 17 teeth

Sprockets

1.40

< 13 teeth

Sprockets

1.25

< 20 teeth

Narrow V-belt pulleys

1.75

Consider influence of pretension force

Flat belt pulleys

2.50

Consider influence of pretension force

Toothed belt pulleys

1.50

Consider influence of pretension force

Gear rack pinion, pretensioned

2.00

Consider influence of pretension force

Gear rack pinion, not pretensioned

1.15

< 17 teeth

Transmission element factor at low temperatures

For temperatures < -30 °C, observe a transmission element factor fZ1 = 1.2.

The overhung load applied to the motor or gear shaft is then calculated as follows:

FR

Overhung load

[FR] = N

Mmax

Torque in Nm

[Mmax] = Nm

fZ

Transmission element factor

 

fZ1

Transmission element factor fZ1 = 1.2 for ambient temperatures < -30 °C.
For ambient temperatures ≥ -30 °C, fZ1 = 1

 

d0

Overhung load determined by diameter of installed transmission element

[d0] = mm