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Rollin’ Rollin’ Rollin’ PowerPoint PPT Presentation


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Rollin’ Rollin’ Rollin’. By Nathan Powell And Jonathan Parkinson. Classifications. Radial Thrust Tapered. Radial. Support only radial loads. Thrust. Supports only axial loads. Tapered. Able to carry combinations of thrust and radial loads. Why Rollers?.

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Rollin’ Rollin’ Rollin’

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Rollin rollin rollin l.jpg

Rollin’ Rollin’ Rollin’

By Nathan Powell

And

Jonathan Parkinson


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Classifications

  • Radial

  • Thrust

  • Tapered


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Radial

  • Support only radial loads


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Thrust

  • Supports only axial loads


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Tapered

  • Able to carry combinations of thrust and radial loads


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Why Rollers?

  • Support larger static and dynamic loads than ball bearings

  • Less expensive for larger sizes and heavier loads than ball bearings.


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Roller Vs. Sliding

Advantages of Roller Bearings

  • Low starting and operating friction

  • Can support combined radial and thrust loads

  • Less sensitive to interruptions of lubrication

  • No self-excited instabilities

  • Good low-temperature starting

  • Can seal lubricant within bearing and “lifetime-lubricate”

  • Typically require less space in axial direction

  • Machine Design by Norton (676)


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Roller Vs. Sliding

Disadvantages of Roller Bearings

  • May eventually fail from fatigue

  • Require more space in radial direction

  • Poor damping ability

  • Higher noise level

  • More severe alignment requirements

  • Higher cost

  • Higher friction (than hydrodynamic sliding)

  • Machine Design by Norton (676)


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Rolling Bearings


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Vendors

  • Micro Miniature Bearing Co., Inc.

    • www.mmbbearings.com

  • Del-Tron Precision Inc.

    • www.deltron.com

  • Berg, W. M., Inc

    • www.wmberg.com

  • Stock Drive Products/Sterling Instruments

    • www.sdp-si.com


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  • The Torrington Co.

    • www.torrington.com

  • Messinger Bearings Corp.

    • www.messingerbearings.com

  • RBC Bearings

    • www.rbcbearings.com

  • *The Bearing Detective

    • www.emersonbearing.com/prods.html#bd

  • Nachi Tech

    • http://www.thomasregister.com/olc/nachiamerica/cylind.htm


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Torrington manufactured its first bearing over 80 years ago. Significant product

innovation dates from the early 1930's, when our engineers developed the drawn

cup needle roller bearing, the outer ring of which is press-formed from strip steel

rather than machined. Other technical breakthroughs have included: the needle

roller thrust bearing, drawn cup roller clutch, wide inner ring bearing with eccentric

locking collar, aircraft control bearings, the screwdown roller thrust bearing for

metal rolling mills, and the innovative, assembled camshaft. Many specialized

products have also been designed for specific applications.


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