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9 BEARING SELECTION PROCEDURE

BEARING SELECTION

BEARING SELECTION

Selection procedure: Rolling bearings include many types and sizes. Selecting the best bearing is important for
getting the machine or equipment to function in the way it is supposed to. There are various selection procedures,
but the most common are shown in the following figure:

PROCEDURE CHECK ITEMS

Function and construction of components to house bearings Bearing mounting location
Confirm operating conditions Bearing load (direction and magnitude) Rotational speed Vibration and shock load
1 and operating environment Bearing temperature (ambient and friction-generated) Operating environment
(potential for corrosion, degree of contamination, extent of lubrication)

Allowable space for bearing Bearing load (magnitude, direction, vibration, presence
Select bearing type and of shock load Rotational speed Bearing precision Rigidity Allowable
2 configuration misalignment of inner/outer rings Friction torque Bearing arrangement (floating side,
fixed side) Installation and disassemble requirements Bearing availability and cost

Design life of components to house bearings
3 Select bearing dimensions Dynamic/static equivalent load conditions and life of bearing
Safety factor Allowable speed Allowable axial load Allowable space

Shaft runout precision Rotational speed Torque fluctuation
4 Select bearing precision Noise level

Material and shape of shaft housing Fit Temperature differential between inner/
Select bearing’s internal outer rings Allowable misalignment of inner/outer rings Load (magnitude, nature)
5 clearance Amount of preload Rotational speed

Rotational speed Noise level Vibration and shock load Load fluctuation
6 Select cage type and material Moment load Misalignment of inner/outer rings Lubrication type and method

Select lubricant, lubrication Operating temperature Rotational speed Lubrication type and method
7 method, sealing method Sealing method Maintenance and inspection

Select any special bearing Operating environment (high/low temperature, vacuum, pharmaceutical etc)
8 specifications Requirement for high reliability

Installation related dimensions
9 Confirm handling procedures Assembly and disassembly procedures.

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