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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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Wheel Bearings

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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

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


Radial Load

Axial or thrust load

Angular Load


Radial load


Angular load


BEARING TERMINOLOGY

  • INNER RACE

  • SEPARATOR OR CAGE

  • ROLLING ELEMENTS

    • BALLS

    • ROLLERS

  • OUTER RACE OR CUP


BEARING TYPES

  • CYLINDRICAL BALL BEARING

  • CYLINDRICAL ROLLER BEARING

  • TAPERED ROLLER BEARING

  • NEEDLE ROLLER BEARING


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..


HEAVY LOAD


Can be double rows of ball bearings

  • For heavy thrust loads

  • Can with stand thrust loads

  • Can handle some axial loads


  • Some FWD use a double tapered bearing.

  • Designed to handle radial and thrust loads.

  • Usually not serviceable


FRONT

WHEEL

DRIVE


Cylindrical Roller Bearings

  • Designed for Radial load

  • Can withstand some thrust load


Tapered roller bearings

  • Excellent capability to handle :

    • Radial Loads

    • Thrust Loads

    • Angular Loads


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


TYPICAL DISC BRAKE BEARING ASSEMBLY


Bearing Diagnosis

  • Normal bearing life

  • Bearing failure


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


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)


Adjustment

PAGE 291L


Springless seal


Double lip seal


Spring loaded Seal


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


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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