New concept package wheel bearing for the automotive industry.

1. MAXIMUM RADIAL DOWNSIZED
PACKAGE WHEEL BEARING FOR LIGHT
TRUCKS AND CARS
Mike Gromosiak, The Timken Company

2. SAE INTERNATIONAL
Typical 4x4 Wheel End Solutions
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Gen 0 Full FloatGen 1 Unipac Gen 2 / Gen 3
• ¾ and 1 ton trucks• Pass car • Pass car
• Light Truck

3. SAE INTERNATIONAL
Key Automotive Wheel Bearing Performance Drivers
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Current Wheel Program Drivers Future Wheel Bearing Program Drivers
Seal
Performance
Cost
Efficiency
Stiffness
Weight
Fatigue
Life
ABS
Robustness
Seal
Performance
Cost
Efficiency
Stiffness
Fatigue
Life
ABS
Robustness
Light-
weighting

4. SAE INTERNATIONAL
4x4 Wheel End Torque Transfer Basics
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Driveline Torque
design limit input
Chassis
Structure
design input
Axle / Wheel Power Flow (Current State)
• Power density enhanced through advancements
in material science / fundamental bearing design
• The halfshaft and ID spline wheel hub interface
is now the limiting factor in developing the next
generation of lightweight wheel end solutions

5. SAE INTERNATIONAL
Maximum Radial Downsize Bearing Concept – Feature Comparison
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Standard Feature MRD Impact
Hub ID spline Axle – Wheel Torque
Transfer Feature
Radial spline outside
of hub
Reduced radial section
92mm Cup Pilot OD 72mm 22% reduction
120mm Cup Bolt Circle 97mm 19% reduction
4.08kg Mass 3.36kg 18% reduction
Axle / Wheel Power Flow
• Transitioning torque transfer interface
outside of the wheel hub ID results in:
- mass reduction
- reduced packaging size

6. SAE INTERNATIONAL
Maximum Radial Downsize Bearing Concept
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Production 4x4 Wheel
Hub Configuration
Maximum Radial Downsize
Hub Configuration
Efficiency Improvement
• Testing showed a 34% reduction in
drag torque:
- addresses industry needs for fuel
economy savings
Gen 2 Bearing MRD Bearing

7. SAE INTERNATIONAL 7
Moving Forward
• OEMs are challenged more than ever to meet future industry efficiency regulations
– Gas
– Hybrids and PHEVs
– BEVs
• In the future there will be more focus on lightweighting vehicle architecture to support
these objectives
– Reduced fuel costs
– Reduced CO2 emissions
• The auto industry must continue to explore existing technologies where improvements
in weight and fuel efficiencies can be realized to support these initiatives
Maximum Radial Downsize Bearing Concept

8. SAE INTERNATIONAL
Thank you
– Mike Gromosiak
– The Timken Company
– 4500 Mt. Pleasant Rd NW North Canton, OH 44720
– (234) 262-6481
– Michael.gromosiak@timken.com
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Maximum Radial Downsize Bearing Concept