ICR for Leaf Spring Suspension

[sdipak]

Hi guys,
Trying to calculate Anti-Dive for rear leaf spring suspension. But not able to locate the ICR for leaf spring.
Any info on this would be much appreciated.

Thanks

Dipak

 

[GregLocock]

Well, what have you tried, and why is it wrong?

Cheers

Greg Locock

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

 

[sdipak]

Greg,
I am not sure how you can calculate/find out Anti dive geometry for leaf spring suspension. In most of the books including Gillespie, inof is given on ICR for links and independent suspension but not for leaf spring.
I am trying to locate pivot point for leaf spring suspension so that I can get ratio of er/dr for Aniti-dive.

And thanks for the reply

Dipak

 

[GregLocock]

Well, take one step back, what do you mean by either (1) the ICR, or (2) antidive

You are asking a question that has no /general/ accurate answer, but there is a 'good enough' answer, depending on your definitions.

Cheers

Greg Locock

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

 

[sdipak]

Greg,
ICR is instanteneous center of rotation. Actually I want to find out the pivot point for the leaf spring so that I can calculate what is the Anti-lift of rear suspension during breaking due to load transfer.
Hopefully this should give you a clear idea.
And sorry for the confusion

Thanks Again

Dipak

 

[GregLocock]

OK, and if you plot the locus of motion of the conatactwheel centre, as you lift the wheel, where does it appear to rotate about? The answer is very straightforward, for the leaf spring suspensions I have measured.

You aren't confusing /me/, you are using words that are poorly defined.



Cheers

Greg Locock

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

 

[sdipak]

Thanks Greg,
I have plot the wheel travel geometry using "3 point method" for leaf spring. Also later I found out in Milliken that the pivot point length of the spring is approx 3/8*Lenght of the spring. They are coming close.
Also one more question, How much Anti-lift generally one should target for rear leaf spring suspension for SUV kind of vehicle.

Again thanks for the input.

Regards,
Dipak

 

[GregLocock]

Well, given that normally the eye height is pretty much in line or below the wheel centre I think most people have settled for the same sort of number. I don't have a number in my head, since I don't use antisquat/antilift as such.

Cheers

Greg Locock

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