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Automotive Wheel Bearings Bearing Basics Things roll better than they slide. Rolling friction has less resistance that sliding friction. Parts last longer! Bearings do this by providing smooth balls or rollers, and inner and outer surfaces for the them to roll against.
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Bearing Basics • Things roll better than they slide. Rolling friction has less resistance that sliding friction. Parts last longer! • Bearings do this by providing smooth balls or rollers, and inner and outer surfaces for the them to roll against. • These balls or rollers “bear” the load. • Two kinds of loading – Radial and Thrust
Radial Loads • Radial loads have the load pulling from one side
Thrust Loads • Thrust loads have the weight of the entire load applied to the surface of all the bearing.
Roller Bearings • Can handle very heavy radial loads. Load is spread out over a large area • 3 types – Flat, tapered and needle
Ball Bearings • Most common type • Can handle both radial and thrust loads of moderate weight • Very small contact point
Hub/Cartridge Bearings • Cartridge – Sealed, pressed in place • Two rows of ball bearings • Used on both front and rear wheels
Front Hub Bearing • Hub – Sealed, Bolted in place • Two rows of ball bearings • Has integral ABS sensor • Splinted to Axle shaft • Contains flange for wheel to bolt up to
Rear Hub Bearing • Hub – Sealed, Bolted in place • Two rows of ball bearings • Has integral ABS sensor • Contains flange for wheel to bolt up to
BEARING SERVICE • Should use brass drift punch • Should use bearing driver whenever possible • Clean bearing and race • Pack new grease in bearing • Use high temp grease on disc brake equipped car.
