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Bolt circle definition

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Edcsd

Automotive
Sep 7, 2013
2
Hi,

I am developing anew heavy commercial wheel family that has a new rim specifications and lower load index. By the new LI, lower, the new wheel family can not use same bolt circle and bolt pattern due to security.

The proposal is to keep bolt circle and change the number of bolts, but my question is: there is a way to calculate structural strength of wheel bolt? What is the considerations? I do not want use CAE methods now because it is under study and I need to investigate a lot of proposals.

Thank you,

Edcsd.
 
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It's a little unclear, but if you are designing a wheel, the vehicle's bolt circle is defined by the vehicle manufacturer and any wheel that would be put on the vehicle has to fit it.

So I think you need to define what vehicles the wheel is going to be designed for - and that would also define the load carrying capacity - and then match what the vehicle's bolt circle is.
 
I don't know about "new rim specifications" being OK or not, depending upon what you're inferring here. If you're speaking in terms of rim profile or shape, I would think you're going to have to follow some sort of existing standard that's out there, such as T&RA. The rim will have to fit existing tires, no? Therefore, if the tire follows a standard, then so will your rim.

Tim Flater
NX Designer
NX 8.0.3.4
Win7 Pro x64 SP1
Intel Xeon 2.53 GHz 6GB RAM
NVIDIA Quadro 4000 2GB
 
So it not too clear and I'll try to clarify my question.

Imagine one wheel 17,5 x 6,75 - 6 holes 143/141 K. I want to develop a new wheel with same characteristics changing only the number of bolt, 17,5 x 6,75 - 5 holes 143/141 K.

How may I get sure that 5 hole could carry the same load without use CAE method? Thank you.
 
As I said in my post, you're going about this backwards.

The vehicle determines what wheel fits on it, not the other way around.

One of the purposes of the difference number of lugs is to prevent using a lower load rated wheel - and while you aren't trying to do that, what you are doing makes no sense, because the GVW of the vehicle is the limiting factor.
 
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