Rodeo
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| posted on 19/10/12 at 04:29 PM |
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Swing arm bearings?
Ive been looking into types of bearing ,as my build progresses.Got so confused over the pro's and cons of each type...needle rollers,bronze
bushes,metalastic bushes,rod ends,or basic roller bearings!
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r1_pete
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| posted on 19/10/12 at 05:12 PM |
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Modern sports bike mainly use needle rollers, excellent location, good life on a light bike, maybe less so in anything heavier.
Older bikes used nylon bushes, I've upgraded several to phosphor bronze, lubing them is another serviice item, still good location but would be
susceptable to quicker wear in a heavier vehicle.
I think netalastic bushes would not provide the location 'stiffness' you need.
What does the arm's donor use? that is probably the best route.
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Rodeo
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| posted on 19/10/12 at 06:47 PM |
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No donor,all scratch built!As I said,Ive found theres pros and cons with each of the types. The needle roller system is popular on bikes
generally,but due to the way I am mounting the arm with seperate left and right mounts,ie hasnt got a 'through bolt' from one side to
other,it means I cant adapt a kit that can be bought for a bike replacement. To buy the parts separately for the needle roller type of pivot is quite
expensive.Im now leaning more to the bronze bush idea(not oilite type ,but old style bronze bushes with the spiral grease groove inside).Then use
thrust washers either side .
Trouble is,Im having probs finding a supplier in UK for the bushes.
metalastic will be too spongy,rod ends,in my opinion,too flimsy,basic roller bearings not sure of.
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fullpint
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| posted on 19/10/12 at 06:53 PM |
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Taper roller bearing set-up. I'm sure the old BMW R100 swinging arm has this and no through bolt/spindle..
I've over 28 years in dealing with magnesium wheels. Refurbishment and can powder coat most metal parts. Visit my web site if you wish..
www.tpcs-magnesium-refurbs.co.uk
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trikerneil
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| posted on 19/10/12 at 07:19 PM |
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Yamaha XS1100 has taper rollers
HTH
Neil
ACE Cafe - Just say No.
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hillbillyracer
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| posted on 19/10/12 at 08:44 PM |
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I know little of conventional motorbikes, but I do work with quads a fair bit. Many use taper rollers for the swing arm bearings, Hondas used to use a
thrust type ball bearing & at least on one model now use a normal ball bearing on one side of the arm & a needle roller on the other so just
one side does the location & the other can float. The needle roller wears out long before the ball bearing.
All of them use a shaft drive with the UJ in-line with the pivot so no through bolts. Most have a stub threaded into the frame sticking through into
the bearing which is pressed into the arm. The exception being the ball/needle roller pivoted Honda which has a bolt through clevis on the frame with
the bearing pressed into the arm.
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Rodeo
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| posted on 20/10/12 at 07:28 AM |
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thanks guys!......... I see what you are all saying,but when Ive looked at those types(or similar) they all appear to have at least a tube connecting
left and right sides,which would transfer the pressure exerted by the pushing of the pivot bolts on to the tapered bearings,but mine will have just 2
arms,with no tube,as I have a transfer box in between.Well,actually there will be a cross bar,but not immediately in line with the rear of the
bearings.I have thought of ways of using taper bearings for my application,but it all tends to get complicated with mounting bracket(s) (lugs) that
are adjustable horizontally! This is why I thought about using a bush,which is simple to replace,and ,of course a lot less complicated to machine up a
holder for!Ill go do some more research and report back.......................
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