Does the shaft geometry has an influence on the resulting bearing loads ?

Tools: SKF SimPro Expert, SKF SimPro Quick

Versions: 4.7

License: Basic

Visible to: Everyone

Description:

In the attached models a TRB set (back-to-back arrangement) with a CRB is used. An external radial load is applied on the shaft.

The geometry of the shaft is changed.

The models will demonstrate and explain the effect of a change of the shaft geometry (a change of the shaft stiffness) on the reaction forces/moments (and consequently on the calculated rating life) in the bearing-shaft system. 

A detailed explanation can be found in the report of the corresponding model.

• Option 1: using a plain shaft
• Option 2: using a shaft with a proper geometry

Generally:

In an overconstrained system, the load distribution is not really predictable as it depends on the stiffness of the whole bearing-shaft-housing system:

• Shaft (and housing) geometry (--> stiffness)
• Bearing type and internal geometry
• Clearance/preload of each bearing in the system (distribution of the clearance of all bearings in the system)
• Position of the bearings
• Position of applied boundaries
• ...

See also SimPro user manual: Therory > Load distribution

SimPro Expert models:

• TRBset - CRB - influence of shaft stiffness.spe

SimPro Quick models:

• TRBset - CRB - plain shaft.spq
• TRBset - CRB - shaft geometry.spq