Date: 2013-08-06

Selection of Bearing Type

Rolling bearings come in a wide variety of types shapes and dimensions. The factor to consider in bearing selection is a bearing that will enable the machine or part to satisfactorily perform. While there are no hard-and-fast rules in selecting a bearing, things to be kept in mind are:

 

Operating conditions and environment

Gather an accurate and comprehensive knowledge of which part of the machine or equipment and the operating requirements and environment. One may require following data:

 

 

• Equipment's function and construction


• Bearing location


• Bearing load (direction and magnitude)


• Bearing speed


• Vibration and shock load


• Bearing temperature


• Environment

 

Performance Requirements

The required performance capacity and function demands are defined in accordance with the bearing application and operating conditions.

 

• Understand the machine and the type of bearing


• Define all demand factors


• Select shape


• Select arrangement


• Select dimensions


• Select mounting method

 

Arrangement Selection

Shaft assemblies generally require two bearings to support and locate the shaft both radially and axially relative to the stationary housing. These two bearings are called the fixed and floating bearings.



Fixed bearing takes both radial and axial loads and "locates" the shaft axially in relation to the housing. The floating bearing relieves stress caused by expansion and contraction of the shaft and also allows for misalignment caused by fitting errors.



Bearings which can support axial loads in both directions are considered most suitable as fixed bearings. In floating bearings the axial displacement can take place in the raceway or along the fitting surfaces. There is also the "cross location" arrangement in which both bearings act as fixing and non-fixing bearings simultaneously. This arrangement is used mainly in comparatively short shaft applications.



Dimension selection

Bearing dimension selection is based on the operating load and the bearing's life expectancy requirements.



Design selection

The most suitable bearing design can be selected by comparing bearing functions and performance demands with the characteristics of each bearing type.

 

 

Legend :

A    = Excellent

 

B    = Good

C    = Satisfactory

F    = Poor

NR = Inconvenient or not recommended

-     = Not applicable

 

Previous: Wheel and Axle Assemblies with Roller Bearings Applied
Next: Selection of Bearing Sizes

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