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Methods
of Preloading
Deadweight:
A fixed weight is set against the bearing ring while adhesive
cures to retain the bearings.
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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.
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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.
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| Stiffness and Resonance
A calculation can be
made to determine the displacement vs. preload curve for a given
bearing.
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Stiffness of assembly is given by inverse slope of this curve
(stiffness = DFa/Dd)
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