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Bearing Geometry - Methods of Preloading || Dynaroll

TECHNICAL PAPERS

TECHNICAL PAPERS

DESIGN FACTORS WHEN USING SMALL BEARINGS, PART 1: BEARING GEOMETRY (Page 4)


Methods of Preloading
Deadweight:
A fixed weight is set against the bearing ring while adhesive cures to retain the bearings.
Spring:
A spring (often Belleville type) is used to press the races together or apart. Note that this assembly will have minimal stiffness, controlled by the spring rate rather than the raceway/ball elasticity.
Solid clamping:
Component parts are machined to precise matched dimensions to remove play when the races are solidly clamped together (Duplex pairs). This method is expensive and not really suited to high volume mass-production.

Stiffness and Resonance

A calculation can be made to determine the displacement vs. preload curve for a given bearing.

Stiffness of assembly is given by inverse slope of this curve
(stiffness = DFa/Dd)


Bearing Geometry, Page 5: Bearing Stiffness link