Thread: K-O-H 2013 With LR content

I would have thought the connection between knuckle and axle flange fail before that....its still only the original 7 bolt rover housing flange.....

Originally Posted by uninformed

I would have thought the connection between knuckle and axle flange fail before that....its still only the original 7 bolt rover housing flange.....

Why? the flange has a much larger surface area and (as you said) 7 bolts to spread the load.

The failed part looks a fair bit thinner than aftermarket D44/D60 outers...

EDIT - e.g.
http://www.trail-gear.com/images/300540-KIT-225.jpg

I'm hope they can get going again and finish. Sorry to see a small piece of steel (or lack of a small amount of steel) end such a campaign. On the bright side this is what prototyping and rigorous testing is for.

From what I can deduce from this distance, the fracture would have started from the RH edge through to the bolt hole. Here the material only looks to be 5 or 6 mm x the plate thickness. Once this material started to let go the load and stress increased rapidly on the other (left) side of the bolt hole, and so on.

The wheel spacers would have increased the stress in that part of the knuckle, so if they can't beef up the replacement knuckles it would help the knuckle if they loose the wheel spacers for some loss of vehicle stability.

Good luck to all concerned

Edit: just looked at the pics again and saw it was the LH knuckle, so what I said would most likely be wrong and the crack would have started on the edge to the LH side (front of knuckle) of the swivel pin hole

I was hoping you would see this thread John. From my guesstimations of sizes and from looking at the pics on Ashcroft site, I would say that when viewed from above, (as in pete's pic) the distance from edge of main/large hole to edge of plate would be min 10mm. I would also guesstimate that thickness of that plate to be no less than 15mm.

here are a couple pf pics from Ashcrofts site:





Ben, my backyard reasoning was that the top and bottom bearing, and their relative plate area are shareing the loads. Add also to that the seperation of them. The load being from the tyre/wheel and that this is further away from the axle housing connection that the "king pins" thus having more leverage. Of those 7 bolts, its only the bottom 4 doing the majority of work...

like I said, just my view and considering that everything in the steering/stub end should be an increase over LR efforts, that the axle housing connection is still stock.

Thats a real shame the knuckle has let go after all the work they have put in, I checked the ones in the workshop as soon as I got in and they measure 20mm :



but looking at the photo Jims don't look like 20mm, his were made so long ago I cant remember what they were, they aren't necessarily the same as the production ones, his look more like 12mm,

chopping the broken part off will be easy enough, it sounds like they can get a new one lasercut there but I am not sure about machining the hole for the swivel bearing but there is loads of tooling onsite and hopefully they will find a way to patch it back together.

I agree the wheel spacers will add a big moment, impacts like I have seen on the 2012 vids will really shock these plates, and unlike a railco type of bush that will absorb a little bit of shock TR bearings are very unforgiving.

I really hope they can get back into it

A Rover isn't a Rover with any other axle, I am certain all can be overcome

Dave and Ian, I am impressed !

JC

John, Dave, do you think that the end of the weld is a possible stress riser for a crack to proagate?

(black arrow)

Yes, There are a lot of sharp edges there , maybe a 1 piece casting would be a better idea for extreme stuff, or some careful/ gentle radii?

Obviously I am not familiar with the overall item; sometimes holding it right in front of you is the only way to form an 'opinion' not from photos so apologies Dave and Ian if I am a little off track.

JC