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7/23/2019 New Perspectives for Axial Bushings
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New perspectives for axial bushingsin stabiliser linkages
Copyright © 2011 MacLean-Fogg Component Solutions. All rights reserved.
Christoph Esswein
Maclean-Fogg Component Solutions GmbH
7/23/2019 New Perspectives for Axial Bushings
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About MFCSAbout MFCSAbout MFCSAbout MFCS
GlobalGlobalGlobalGlobal automotiveautomotiveautomotiveautomotive suppliersuppliersuppliersupplierSuspension linkages
Sensor linkages
Fasteners
MFCS LiederbachMFCS LiederbachMFCS LiederbachMFCS Liederbach
R&D for suspension and sensor linkages
Copyright © 2011 MacLean-Fogg Component Solutions. All rights reserved.2
7/23/2019 New Perspectives for Axial Bushings
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Task of aTask of aTask of aTask of a stabiliserstabiliserstabiliserstabiliser linklinklinklink
…to hold two chassis hard points that move in different curves ina predefined distance to each other.
>> High axial stiffness>> Low bending stiffness
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7/23/2019 New Perspectives for Axial Bushings
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Designs on the market todayDesigns on the market todayDesigns on the market todayDesigns on the market today
BallBallBallBall jointjointjointjointHigh axial stiffnessBending stiffness only ball joint frictionComplex design
Durability issuesInterface issues
RadialRadialRadialRadial BushinBushinBushinBushin
Copyright © 2011 MacLean-Fogg Component Solutions. All rights reserved.4
Acceptable axial stiffnessBending stiffness highly dependent on orientationGood durabilityInterface issues
AxialAxialAxialAxial BushingBushingBushingBushing…………
7/23/2019 New Perspectives for Axial Bushings
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Chassishard
points
Grommets
Basic layout/ mechanical modelBasic layout/ mechanical modelBasic layout/ mechanical modelBasic layout/ mechanical model
Nut
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Example for a axial bushing designBolt
Spacer
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FromFromFromFrom PogostickPogostickPogostickPogostick to tototo PogoStikPogoStikPogoStikPogoStik
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Mechanical model / cut sectionMechanical model / cut sectionMechanical model / cut sectionMechanical model / cut section
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7/23/2019 New Perspectives for Axial Bushings
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Standard axial bushing designStandard axial bushing designStandard axial bushing designStandard axial bushing designMassive cylinder shaped grommets made from rubber or soft TPU
Axial stiffness lower than 3 kN/mm
Bending stiffness higher than 5 Nm/ °
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Removal of unnecessary materialRemoval of unnecessary materialRemoval of unnecessary materialRemoval of unnecessary materialNo significant loss of axial stiffness
Horizontal guidance function unnecessary
Lower bending stiffness
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Utilization of differences in stress distribution between load cases
Significant improvement of axial to bending stiffness ratio
Design enables usage of harder materials (e.g. TPU)
Adaption of load bearing surfaceAdaption of load bearing surfaceAdaption of load bearing surfaceAdaption of load bearing surface
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Centering effect
Lower bending stiffness
Introduction of conical washerIntroduction of conical washerIntroduction of conical washerIntroduction of conical washer
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Specific profile on end of threads allows torque controlled assembly
Chamfers on grommets assure correct position on chassis hard point
Retention feature holds grommet on bolt between assembly steps
Snap-fit feature on grommet interlocks with washer or spacer
Integration of assembly aidsIntegration of assembly aidsIntegration of assembly aidsIntegration of assembly aids
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7/23/2019 New Perspectives for Axial Bushings
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MFCSMFCSMFCSMFCS PogoStikPogoStikPogoStikPogoStik designdesigndesigndesign
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SPSSPSSPSSPS PogoStikPogoStikPogoStikPogoStik withwithwithwith rubberrubberrubberrubber grommetsgrommetsgrommetsgrommets
0,82 kN/mm @ 0,83 Nm/ °
RSRSRSRS PogoStikPogoStikPogoStikPogoStik withwithwithwith TPUTPUTPUTPU grommetsgrommetsgrommetsgrommets
4,73 kN/mm @ 1,72 Nm/ °
7/23/2019 New Perspectives for Axial Bushings
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Enclosed rubber ring can only deflect under bending loads
Even harder TPU types feasible with acceptable bending stiffness
High performance designHigh performance designHigh performance designHigh performance design
Rubber
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TPU
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MFCSMFCSMFCSMFCS HiPerStikHiPerStikHiPerStikHiPerStik designdesigndesigndesign
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HiPerStikHiPerStikHiPerStikHiPerStik (prototype)(prototype)(prototype)(prototype)
7,34 kN/mm @ 2,30 Nm/ °
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Axial stiffnessAxial stiffnessAxial stiffnessAxial stiffnessmeasured on completemeasured on completemeasured on completemeasured on complete assemblyassemblyassemblyassembly
Copyright © 2011 MacLean-Fogg Component Solutions. All rights reserved.16
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Axial stiffnessAxial stiffnessAxial stiffnessAxial stiffnessmeasured on completemeasured on completemeasured on completemeasured on complete assemblyassemblyassemblyassembly
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Bending stiffnessBending stiffnessBending stiffnessBending stiffnessmeasured on a single interfacemeasured on a single interfacemeasured on a single interfacemeasured on a single interface
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Bending stiffnessBending stiffnessBending stiffnessBending stiffnessmeasured on a single interfacemeasured on a single interfacemeasured on a single interfacemeasured on a single interface
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MFCSMFCSMFCSMFCS P PPPogoStikogoStikogoStikogoStik/ // /HiPerStikHiPerStikHiPerStikHiPerStik p ppportfolioortfolioortfolioortfolio
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Axial stiffness rangeAxial stiffness rangeAxial stiffness rangeAxial stiffness range
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Bending stiffness rangeBending stiffness rangeBending stiffness rangeBending stiffness range
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Integration examples:Integration examples:Integration examples:Integration examples:Subcompact car front axleSubcompact car front axleSubcompact car front axleSubcompact car front axle
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Integration examples:Integration examples:Integration examples:Integration examples:Compact car rear axleCompact car rear axleCompact car rear axleCompact car rear axle
DBJ PogoStik ®
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Integration examples:Integration examples:Integration examples:Integration examples:Light truck applicationLight truck applicationLight truck applicationLight truck application
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Thanks a lot for your time!Thanks a lot for your time!Thanks a lot for your time!Thanks a lot for your time!
Questions?Questions?Questions?Questions?
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Christoph EssweinChristoph EssweinChristoph EssweinChristoph EssweinMFCS EngineeringMFCS EngineeringMFCS EngineeringMFCS Engineering and andandand DevelopmentDevelopmentDevelopmentDevelopmentcesswein@macleanfogg.comcesswein@macleanfogg.comcesswein@macleanfogg.comcesswein@macleanfogg.com
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