Vehicle & Technical > Defender

front UJ

<< < (6/7) > >>

Wolfie:

--- Quote from: "Range Rover Blues" ---Like I said I can't understand why they come from the factory out of phase and no-one can explain it to me either.
--- End quote ---


Have thought a bit about how to explain this, but without delving into a demonstation using 3d vector analysis, or having the x-thousand quid for a copy of ADAMS, it's a bit difficult to put into words.

If you have a look at Kinematics of Universal Joints and Complete compensation for uneven movement by the Second Joint you should be able to see why the joints need to be out of phase. I'll continue to think how to explain it and maybe come up with something sensible.

I can see why they need to be out of phase and why lifting would require a change of phase angle (even if camber compensated arms are used) - I'm just not very good at putting things into words.

Regards

Andy

[/url]

Range Rover Blues:
Yeap, I know all that but it still doesn't explain why the 2 joints 'should' be out of phase, the gearbox output shaft and the diff pinion shaft are both in line with the chassis, so the deflection is only in one plane therefore the first joint and second joint should be in line with each other, effectively cancelling each other out.  Or is the diff pinion further to one side than the gearbox output?

Wolfie:

--- Quote from: "Range Rover Blues" --- Or is the diff pinion further to one side than the gearbox output?
--- End quote ---


Looking at the Haynes BOL it seemed that the propshaft is not parallel with the vehicle centreline, so I had to go and look at the car. On Heather (200Tdi defender) a (very) rough measurement shows that the diff pinion is about an inch and a half further outdoard than the tranfer box output flange.

It's all beginning to make more sense to me, I remember wondering why the joints were out of phase when I replaced my front prop but accepted it without researching the reason.

I feel a challenge coming on - a simple way of detemining how the prop should be set for different set ups, but this would be complicated by the need for accuate measurements and the variability of what a 2" lift does.

Regards

Andy

Range Rover Blues:
Given that the prop is designed for a standard height car, then if the diff pinion and gearbox output are not in line, I can see why the UJs don't line up on the propshaft, because they are in fact 'in phase' with each other.  I'm going to go lie under the car for a while.......


However, for a 2"lift, yet another reason to go for a Cardan joint :D

Budgie:

--- Quote from: "Range Rover Blues" --- I'm going to go lie under the car for a while.......
--- End quote ---
I'd think you'ld need to after that little lot of thinking on a weekend!  :lol:

Navigation

[0] Message Index

[#] Next page

[*] Previous page