That is exactly the same reason I went for Tongsheng.
Tongsheng crank wobble - can I use Loctite?
- Thread starter jimat
- Start date
Today I removed the axle from the new TSDZ2B (Varstorm) motor (which is not yet installed).
There is a 61902 RS bearing (on the left side, of course) and it has almost no play on the axle.
However, the additionally purchased 6902 RS has quite a loose fit on the axle (in the place where an additional bearing should be installed(I didn't remove the original factory bearing)) and it noticeably "wiggles"...
I wonder why this is the case.. is it some kind of modified axle with a larger diameter at the factory bearing installation point on 2B? 0_o
There is a 61902 RS bearing (on the left side, of course) and it has almost no play on the axle.
However, the additionally purchased 6902 RS has quite a loose fit on the axle (in the place where an additional bearing should be installed(I didn't remove the original factory bearing)) and it noticeably "wiggles"...
I wonder why this is the case.. is it some kind of modified axle with a larger diameter at the factory bearing installation point on 2B? 0_o
It could be that the original 61902RS is sealed, or that the axle diameter varies. Once I measured 14,9mm, so every 15mm bearing will have some wobble.
The point is that axle isn't supported well enough with just one bearing on one end of it.
With extra bearings on both ends of the axle, the wobble will be minimized and the forces on that single bearing will be less.
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There's no bearing on the spindle (top of pic), just a dust seal?
Correct, that extra bearing comes instead of that seal inside the spider.
Same as the last (MAX) option with no seals, but two extra bearings, what gives in total 4 bearings on the axle instead of just one.
Only disadvantage is that there are no seals anymore, so you must use sealed bearings and seal the small gap between inner bearing and axle. I did this with tight O-rings on the axle.
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coud you please show the example of thith O-rings? rubber?
I have this situation for now
and there is no longer any room for the rubber seal on the right (from the sprocket), also I am not very sure that the bearing will not fall out over time...
maybe you meant the rubber O-rings that will fill the space between the bearing and the crank? this will protect it from dust and will hold the bearing in place..?
There is a large bearing where the clutch is, and yes, the axle "contacts" only with the bushing.
and the axle goes in quite easily, that's why the axle-cranks have play...
And with 3-4 additional bearings, I think this play will be almost imperceptible, but the main thing is that it will increase the reliability of the axle, torque sensor 10 times
p.s. video of stock and additional bearing on the axle
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Exactly. I used a couple of 14,5mm rubber O-rings (silicon greased) to fill that space.
I glued the bearing inside the spider with epoxy, but you can use Loctite 641 medium strenght retainer compound too.
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In general - yes. However, these O-rings and glue(Loctite etc) together - cost as much as 10 bearings)
That's why I thought for some reason... that 10 bearings would pre-survive this glues and rubbers x2 times)
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There are cheaper Loctite substitutes (RS R41, Holdtite R941, Holdit R41, Luoke LK641, Higlue 641), but relative expensive too.
That is why I used epoxy glue. The O-rings I have as an assortiment in a small box from AliExpress.
You need glue, if the bearing isn't tight enough inside the spider, so it can fall out.
Also you need a new sealing, because the rubber dust seal is gone and the new bearing has a loose fit on the axle.
The O-rings with silicon grease prevent water ingress.
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