PSpirine
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| posted on 14/7/10 at 08:25 PM |
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Rocker thoughts?
I'm close to finalising the geometry of rockers for my Haynes roadster (inboard suspension), but am still undecided as to the best way of
attaching them to everything!
One end will activate a standard 9-13" shock, so is a 34mm bracket end.
The other end will be set up to take a spherical rod end with off-the-shelf cone washers either side - any idea what size I should be looking at - M12
beefy enough?
Those are the easy ones.
The last bit, is how do I mount the rocker to the chassis?
I'm trying to keep this relatively low cost, so am trying to avoid 2 bearings pressed into either side of the rocker riding over a shaft mounted
on a chassis bracket.
Is there any reason why I can't just make the rocker pivot a 33.7mm opening as per wishbone tubes, and simply fit it with a polybush with crush
tube into a standard 44mm bracket?
I was actually considering using bushes on either side of the pushrod as it's riding in a completely vertical plane, but given the cost of
bushes, sphericals aren't too far off in terms of cost!
I welcome your thoughts.
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paulf
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| posted on 14/7/10 at 08:38 PM |
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I wouldn't use poly bushes as there is a heavy loading on the rocker bush and it would probably distort and fail fairly quickly.
Needle roller or bronze bushes on a hardened shaft would be the best option. I think some manufacturers used mini or metro rear suspension arm needle
rollers.
Paul
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MikeR
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| posted on 14/7/10 at 09:11 PM |
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I heard that as well - but i believe they stopped at some point.
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matt_gsxr
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| posted on 14/7/10 at 10:38 PM |
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J15 and fury solution (both Sylva) and proven to work well.
Matt
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PSpirine
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| posted on 15/7/10 at 06:38 AM |
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Matt, are those just standard poly bushes in the pivot in the lower image?
Cheers,
Pavs
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adithorp
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| posted on 15/7/10 at 12:40 PM |
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quote:
Originally posted by PSpirine
Matt, are those just standard poly bushes in the pivot in the lower image?
Cheers,
Pavs
No, they're nylon bushes, reamed out to be a smug fit on the shaft.
Mini/metro rear arm needle roller bearings have been used as an upgrade, but the small range of movement means they constantly load the same spot on
the bearings and can soon fail.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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PSpirine
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| posted on 15/7/10 at 05:26 PM |
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Hmm very interesting. So as long as I've got access to a lathe, I can still use standard 44mm crush tubes and suspension brackets, and simply
make a very tight fitting nylon bush instead of using standard poly jobbies?
Cheers!
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adithorp
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| posted on 16/7/10 at 12:30 PM |
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The bush is reamed such that it will just hold the (bare) rocker in position but will move easily by hand. The one in the picture has had a grease
nipple added. Thats not standard but the pivot tube is mild steel and tends to rust/sieze so it's a common mod'.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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