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Author: Subject: Bolt on hubs/ bearings
GRRR

posted on 17/3/20 at 12:25 PM Reply With Quote
Bolt on hubs/ bearings

Hi all,

I'm working on a design for uprights and currently using BMW Mini bolt on hub and bearing assembly. The bearing/hub (seems common in all bolt on hubs) has a circular feature that locates onto a large hole in the Mini trailing arm, with the hub bolts just proving clamping force. Any thoughts on what sort of fit that hub cylindrical feature to trailing arm hole would be? I'm thinking a clearance fit, H9-e9, but any thoughts from clever engineers would be appreciated.

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[Edited on 17/3/20 by GRRR]

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pigeondave

posted on 19/3/20 at 12:12 PM Reply With Quote
Can't help with the question, but have one of my own.

What's the PCD of the hubs (wheel end) ?

I thought it was only Saab hubs which have a ford PCD?

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nick205

posted on 19/3/20 at 01:39 PM Reply With Quote
Don't Peugeot hubs have the same PCD as Ford (different centre bore diameter though)?
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pigeondave

posted on 19/3/20 at 01:59 PM Reply With Quote
quote:
Originally posted by nick205
Don't Peugeot hubs have the same PCD as Ford (different centre bore diameter though)?


Yes, but i don't think they do a bolt on hub/bearing like the one shown in the pic.

I believe that AB Performance uses the Saab ones machined down, unless its a special made one.
I've only ever seen pics as Stoneleigh falls wrong for me most years

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coyoteboy

posted on 21/3/20 at 12:48 PM Reply With Quote
Think a clearance fit is too loose for this use, H9e9 is not a normal combo. You want a transition fit so it's snug and yet doesn't require mechanical fitting. H7h6 ish. That interface carries all your vertical loading to prevent your bolts getting bending loads, any gap will mean the clamping friction is all that is preventing your bolts seeing bend.

You might get away with it, but id prefer tighter if it were me.

Fwiw I am using audi bolt on units liike above but with the correct pcd.

[Edited on 21/3/20 by coyoteboy]





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GRRR

posted on 22/3/20 at 10:10 PM Reply With Quote
Awesome thanks for the reply Coyoteboy
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phelpsa

posted on 24/3/20 at 09:56 PM Reply With Quote
On a road car these sorts of interfaces will be a decent clearance as it makes assembly much quicker/easier. The ones I have worked with in the past have been something in the region of 25-50 micron diametral clearance. The reality is that the spigot is only really there for location, the clamping face transfers the load in all but the heaviest of impacts. Obviously a transition fit would be better but probably not necessary.
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