A backing bearing (or backup bearing) is a specialized support bearing designed to protect machinery from excessive radial or axial loads during abnormal operating conditions. Commonly used in tandem with magnetic bearings, turbines, or high-speed spindles, these bearings act as a fail-safe mechanism when primary systems fail.

How Backing Bearings Work

When primary bearings (e.g., magnetic or fluid-film bearings) malfunction due to power loss or overload, backing bearings:

Key Applications

Types of Backing Bearings

Type Features Example Models
Rolling Element Ball/roller design, low maintenance SKF BB-500 Series
Plain/Sleeve Oil-impregnated, high heat resistance Waukesha 88T
Hybrid Ceramic rollers + steel races NSK Hybrid BB-U100

 

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