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A arm design

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Perter123 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Perter123 Quote  Post ReplyReply Direct Link To This Post Topic: A arm design
    Posted: Mar/19/2014 at 7:36am
hi guys  ......im new to this community..im dealing dealing with suspensions in my team....can anyone  give the advantages and disadvantages of(unequal) parallel and unparallel a arm suspensions???...i reffered to race vehicle dynamics by milliken and is being confused with the term rollcamber(unparallel)...what actually is this rollcamber Confused...is that for racing supension or AtV suspension..????????
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njgedr View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njgedr Quote  Post ReplyReply Direct Link To This Post Posted: Mar/19/2014 at 8:28am
Roll Camber is generated from unparallel A arms or unequal length A arms in the front view. Unparallel A arms generate camber change as they go through their motion. You can use this to add camber in turns from the car rolling. You typically want to use camber to keep the tread pattern on the ground when the tire deforms, but it is debatable whether it is useful in offroad conditions with ATV tires that are so rounded. 

We used unequal length unparallel A arms. In hindsight, it wasn't worth the added complexity and time to minimize bump steer and manufacture the frame and arms. For the front suspension most of our gains came from Toggle, Spindle Offset, Ackermann and Caster. We played with anti dive and squat too which was also not worth the time. There is enough to keep you busy there without playing with dynamic camber.

Before someone jumps me, this is all strictly for baja talk, on road camber is very important.
Rowan Baja 2009-2012
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Epreuve Du Norde 12
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Perter123 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Perter123 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2014 at 8:36am
ok thanks....can u tell me how much body roll is expected???
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zglazer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote zglazer Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2014 at 11:20am
That depends entirely on your vehicle design. Nobody can answer that question for you.
Zack Glazer
McGill Baja Racing Alumnus 2009-2013 http://baja.mcgilleus.ca/
2012-2013 Drivetrain Designer
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