Guiding values for options of dimensions of the hub.

In case of couplings of shafts with hubs, the dimensions are chosen depending on the type of coupling, material of the hub and diameter of the shaft and usually according to empirical values given in the following table:

Ratio

 D/d L/d

Material of the hub

 Steel Grey cast iron Steel Grey cast iron
Pin coupling: with a cross pin

                  with a longitudinal pin

 2 - 2.2

1.6 - 1.8

 2.2 - 2.5

1.8 - 2

 0.8 - 1.2

1.2 - 1.8

 1 - 1.5

1.5 - 2
Coupling using a tight or disc key 1.6 - 1.8 1.8 - 2 1.2 - 1.8 1.5 - 2
Splined couplings 1.6 - 1.8 1.8 - 2 0.6 - 0.8 0.8 - 1
Axis-sliding hubs 1.6 - 1.8 1.8 - 2 1.8 - 2 2 - 2.2
Pressure couplings (cylindrical, conical) 2 - 2.4 2.2 - 2.6 0.6 - 1 1.2 - 1.5
Clamping couplings and couplings with longitudinal keys 1.8 - 2 2 - 2.2 1 - 1.5 1.6 - 2

 

where:

D ... outer diameter of the hub

L ... length of the hub

d ... diameter of the shaft

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