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kingpin inclination and camber change

kingpin inclination and camber change

kingpin inclination and camber change

(OP)
hi,

i am currently learning suspension geometry and i am really having a hard time understanding the relationship between kinpin inclination and camber change. from what i read, a positive kingpin inclination (upper balljoint closer to the center line of the car) will cause a positive camber change upon steering of the wheels and vice versa.

i am really having a hard time visualizing this because if the kingpin axis is positive wouldnt that increase negative camber upon steering of the wheels?. i have tried modeling an SLA suspension with wooden sticks but with no luck because i cant get an accurate measurement. is there a simple program i can use to simulate this? or am i completely misunderstanding this relationship?

thanks in advance

RE: kingpin inclination and camber change

I think you are wrong. For simplicities sake set the camber equal to -kpi, it the wheel face is parallel to the kp. Now steer the wheel by 90 degrees. It is now vertical, ie zero camber.

Cheers

Greg Locock

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RE: kingpin inclination and camber change


As far as your question is concerned, the suspension should be left out of the picture. The ball joints are simply two points representing a single line, just like a king pin. This should be very easy to model.

Once you get that visualized, you can move one point back or forward and see the effects of castor.

RE: kingpin inclination and camber change

yes, sounds like you've got your kingpin angles and effects mixed up. axis inclination & caster

RE: kingpin inclination and camber change

The craziness is that kpi is positive in at the top, camber is positive out at the top.

Blame the SAE!

Cheers

Greg Locock

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: kingpin inclination and camber change

(OP)
"... For simplicities sake set the camber equal to -kpi, it the wheel face is parallel to the kp. Now steer the wheel by 90 degrees. It is now vertical, ie zero camber. "

that visualization helped alot and yes blame SAE for the confusion lol.

thanks again

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