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What’s inside a 2012 model NuVinci N360?
#11
Drawings explain far better than words.

[Image: ao1o.jpg][Image: ul8b.jpg]

I’m much more optimistic about finding traction fluid now that I know it doesn’t contain any metal particles. I always thought the fine powder was meant to be there and it was just the larger particles that weren’t. Santotrac 50 is looking much more promising.
- Oran
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#12
If you could put your hand on a densidometer and a viscometer (can be found for cheap or borrowed) You could determine the closest match with santolubes...

My guess is that it will be like Santotrack 32... The 50 formula is for food plants... The 32 formula has enhanced anti-corosion additives...
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#13
And don't forget, Fallbrook invented the hub, but surely not the oil in it! They probably built the hub around the specs of the fluid, not the other way around.
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#14
I was under the impression that Fallbrook did have some input into the development of the traction fluid. I’ve just found the name of it which I noted down a while ago as Valvoline's INVARITORC 638. I have tried a search and got nowhere with finding any specs.
Tracking down this oil may not be possible but I think it will be more fun to find an equivalent. Then we can find out if all the talk about Fallbrook’s oil working at lower clamping pressures is in fact true.

I’m not very clear about what specifications really matter when it comes to traction fluids. Coefficient of traction is obviously an important one but is there anything else that matters.
- Oran
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#15
I thought I would take a different approach towards finding suitable traction fluid. As I can measure the components inside the hub I can in theory calculated the required traction coefficient. What’s of importance for this is the angle of the ramps on the backs of the traction rings. It’s the ramps that create the clamping pressure from the input and output torque.

The angle of these ramps is 7 degrees and using basic trig this means the clamping force will be 8.1 times greater than the force exerted by torque. The resulting traction coefficient required is 0.12 or greater. Unless my calculations are wrong this means it is a bit above that of the traction fluids I have come across. Santotrac 32 averages 0.1 and Idemitsu TDF (Traction Drive Fluid) is 0.07 – 0.09.
- Oran
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#16
Told ya... Santotrac 32!!! Maybe you can ask for perticular additives to add in the mix to avoid deterioration of aluminium and other soft metals in the hub.
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#17
I’m concerned that the traction coefficient of the oil needs to be higher than the traction coefficient generated by the hub. Doesn’t this mean that the traction fluid needs a coefficient of traction of around 0.13 – 0.14. Meanings it’s a bit beyond most fluids available and suggests Fallbrook have managed to lower the clamping pressure.
- Oran
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