BEARINGS

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BEARINGS

• By Laurence Kwok

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Common Types

• 2 Types
• Linear
• Rotary

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6 Principles of Operation

• Plain Bearings
• Rolling-Element Bearings
• Jewel Bearings
• Fluid Bearings
• Magnetic Bearings
• Flexure Bearings

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Plain Bearings

• Carries loads by sliding
• Usually made of 2 parts
• Commonly used

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Rolling-Element Bearings

• Round pieces placed between 2 objects
• Various types
• Pretty well rounded in terms of bearings

Image from http//www.tribology-abc.com/calculator
s/e12_3.htm
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Jewel Bearings

• Rolls shaft into bearing, rather than sliding
• Used mechanical watches
• Used in sensitive measuring tools

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Fluid Bearings

• Supports load on thin later of gas or liquid
• Cheaper than other bearing types
• Lasts very long

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Magnetic Bearings

• Supports loads using magnetic levitation
• Supports objects in vacuum environment
• Used in some trains for magnetic levitation
• High cost, low accuracy, large size

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Flexure Bearings

• Made of 1 part, connecting 2 others
• Simple
• No specialized equipment required
• Relies on repeated flexing

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Sources

• http//www.bearings.machinedesign.com/
• http//en.wikipedia.org/wiki/Bearing_28mechanical
  29
• http//science.howstuffworks.com/bearing.htm
• http//www.efunda.com/DesignStandards/bearings/bea
  rings_introduction.cfm