Ford Revo Knucle
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Transcript of Ford Revo Knucle
1Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
IntroductionThe simple answer to torque steer:
“Revo” Suspension
• Dipl. – Ing. Michael Frantzen
• Dipl. – Ing. Jasper Bouma
• Dr. – Ing. Wolfgang David
• Dipl. – Ing. Marc Simon
• Dipl. – Ing. Lauri Ohra-aho
Ford Forschungszentrum Aachen
2Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Index
• „Torque Steer“
• RevoKnuckle
• Results
3Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Wheel Forces and Moments
4Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Wheel Forces and Moments
5Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Wheel Forces and Moments
Focus or Mondeo Knuckle
King pin axis
Wheel center
50 –75 mm
6Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Disturbing Forces and Moments• No „Torque Steer“ on symmetric conditions
7Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Technology Description & Scope
„Torque steer“ on asymmetric conditions
Torque Steer Feedback
8Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Tire Conicity
9Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Torque Steer Contributors
• Road Conditions(friction and surface)
• Vehicle State(cornering,roll., acc.)
• Weight Distribution (loading)
• Suspension Geometry(kingpin offset, camber,caster, tolerances)
• Tire Quality(Conicity, wear, profile)
• Wheel Geometry (size, uniformity, wheel offset)
• Engine (torque, alignment)
• Differential(friction, self locking effect, Torsen differential)
• Drive Shafts (alignment, length, symmetry)
10Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Index
• „Torque Steer“
• RevoKnuckle
• Results
11Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
RevoKnuckle vs. McPhersonRevoKnuckle MacPherson Strut
Tire Contact Patch
King Pin Axis
Wheel Centre Line
Scrub Radius
King Pin Offset
Wheel Centre
Balljoint
New Bearings
Sleeve Joint
12Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
RevoKnuckle – RevoKnuckle Joint Concepts
Ball Joint
New FFA / ZF Patent Application
Roller Bearing
13Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Advantages concept• Improved Vehicle Dynamics Performance
- Torque Steer- Wheelfight- Steering Nibble- Brake Judder
• Reduced torquesteer sensitivity to changes in tire size (low aspect ratio) and tire conicity
• Fits to McPherson package, no body changes
• Less expensive than Double Wishbone suspension
• Lighter than Double Wishbone suspension
• Smaller Kingpin offset vs. Double Wishbone suspension : 20-30 vs. 40 mm
14Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Index
• „Torque Steer“
• RevoKnuckle
• Results
15Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Kinematics Results
16Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
FEA Results
17Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
Driving Results
Results from Driving Evaluation:
• Significant reduction of “torque steer effect”
• Improved vehicle dynamics performance
• No additional error state
• Promising Concept for front driven highperformance vehicles
18Suspension Projects - The RevoKnuckle
Research & Advanced Engineering Vehicle DynamicsCopyright © Ford Motor Company 2004
End
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