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Wheel Bearings - PowerPoint PPT Presentation


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Wheel Bearings. Bearing uses. Pivots Wheels Rotating shafts Oscillating shafts Sliding shafts. BEARING LOAD. RADIAL LOAD - When bearing load is applied in a vertical direction. THRUST LOAD - When bearing load is applied in a horizontal direction

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Bearing uses

  • Pivots

  • Wheels

  • Rotating shafts

  • Oscillating shafts

  • Sliding shafts


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BEARING LOAD

  • RADIAL LOAD - When bearing load is applied in a vertical direction.

  • THRUST LOAD - When bearing load is applied in a horizontal direction

  • ANGULAR LOAD - When bearing load is applied in between vertical and horizontal


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Radial Load

Axial or thrust load

Angular Load




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BEARING TERMINOLOGY

  • INNER RACE

  • SEPARATOR OR CAGE

  • ROLLING ELEMENTS

    • BALLS

    • ROLLERS

  • OUTER RACE OR CUP


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BEARING TYPES

  • CYLINDRICAL BALL BEARING

  • CYLINDRICAL ROLLER BEARING

  • TAPERED ROLLER BEARING

  • NEEDLE ROLLER BEARING


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Cylindrical Ball bearings

  • Radial loads only..

  • Can be double rows of ball bearings..

  • Installing bearing..

    • Press the outerrace in a housing..

    • Press the inner race on a shaft..



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Can be double rows of ball bearings

  • For heavy thrust loads

  • Can with stand thrust loads

  • Can handle some axial loads


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FRONT

WHEEL

DRIVE


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Cylindrical Roller Bearings

  • Designed for Radial load

  • Can withstand some thrust load


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Tapered roller bearings

  • Excellent capability to handle :

    • Radial Loads

    • Thrust Loads

    • Angular Loads


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NEEDLE ROLLER BEARING

  • Is very compact

  • Small steel rollers

  • Thin outer race

  • Used in steering gears and alternators

  • Rollers push against each other

  • For Radial Loads



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Bearing Diagnosis

  • Normal bearing life

  • Bearing failure


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BEARING FAILURES

  • BENT CAGE

  • ETCHING

  • BRINELLING

  • ABRASIVE ROLLER WATER

  • GALLING

MUST REPLACE RACE AND BEARING AS A SET!!!

SERVICE AND SYSTEMS

LAB MANUAL

PAGE 284, FIG 9-54


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BEARING SERVICE

  • Should use brass drift punch (286L)

  • Should use bearing driver whenever possible (286C & 291L)

  • Clean bearing and race

  • Pack new grease in bearing (289C)

  • Use high temp grease on disc brake equipped car. (265L)


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Adjustment

PAGE 291L





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Seal Replacement

  • Different brands look different

  • What is important is:

    • Match the OD

    • Match the ID

  • Some brands have a steel lip and some do not.

  • (Caution) The steel housing is very thin on some


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Remember

Not only does the seal need to look good now............

It need to be good enough for the next several thousand miles.

Buying new seals are a cheap insurance


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