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  • Car Suspension stub axle

    Discussion in 'The main mechanical design forum' started by yct08280, Mar 24, 2014.

    1. yct08280

      yct08280 Member

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      Why stub axle are of forging in double wishbone suspension instead of casting??

      for pivot bush in lower control arm,how should be its orientation??
       
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    3. Erich

      Erich Well-Known Member

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      Forging is used for high strength and therefore lighter weight than casting.

      Castings typically have lower ductility than forgings. They also can have porosity and inclusions that create stress concentrations.

      All bad things for a part that sees lots of fatigue cycles and unpredicatable impact loads.

      Don't understand your second question on the bushing.
       
    4. yct08280

      yct08280 Member

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      Lower control arm

      Hi,
      I am going to design lower control arm for car.
      I want some guideline for pivot bush oriention.
      i)both should be horizontal?
      ii)both should be vertical?
      iii)one should be horizontal & other vertical??[​IMG]
       
      Last edited: Mar 25, 2014
    5. yct08280

      yct08280 Member

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      Dear Erich,
      Mostly i have seen stub axle of casting in macpherson strut design & forging in double wish bone suspension.
      Is it possible to replace forging stub axle by casting???
      or
      what is reason in double wishbone suspension that forging stub axle is required??
       
    6. Dana

      Dana Well-Known Member

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      As Erich said, a forging is stronger and thus can be lighter weight than a casting of comparable strength. However, it will cost more to manufacture. This gets into issues of manufacturing economics or even marketing.

      The orientation of pivot bushings is a matter of the direction of motion they will have to accommodate.
       
    7. yct08280

      yct08280 Member

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