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WORKED EXAMPLE - Calculating Hertzian Pressure

A 2 tonne load is placed 600mm from the point of suspension. The bearings are spaced 500mm apart.
Which bearings should be used?

Using the Moment-Balance formula:

C = (P . L) / (2 . I)

where:

P = Weight of the load being moved (N)

L = Distance between the load and P, the suspension point (mm)

I = Distance of bearings from the suspension point (mm)

C = Maximum allowable static force per bearing

Assuming the bottom pair of bearings are level with the point of suspension then I = 500mm. The load is cantilevered out at 600mm and hence this is the value of L. Here P is 20000N.

Substituting these numbers into the equation gives
C = 12000N

Looking up this value of C on the Hertzian Pressure table shows that 4.058 is the required bearing size.

herztian pressure calculation for fork truck mast profile


Standard Combined Bearings standard cr bearing
Channel / Profile Data
Jumbo Bearings (4.089-4.096)
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