Determining the overhung load

INFORMATION

With gear units, the application point is assumed to be at the A-side. For gear units with hollow shaft and key, the values refer to force application to the front end of the hollow shaft.

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

Influence of pretension force

Flat belt pulleys

2:50

Influence of pretension force

Toothed belt pulleys

2.00 – 2.50

Influence of pretension force

Pinion-gear rack, pretensioned

2:00

Influence of pretension force

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

FR

= Overhung load in N

Md

= Torque in Nm

d0

= Mean diameter of the installed transmission element in mm

fZ

= Transmission element factor