liam.mccaffrey
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| posted on 16/7/08 at 07:50 PM |
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CVT's
when I was a kid I was really interested in engineering and I had a really cool idea for a gear drive that could vary the output speed for a constant
input. I made a working model out of some wood blocks my dad gave me. I didn't know it at the time but it was a half toroidal CVT.
I didn't think about it again for years because I found it had already been invented but I was wondering what do the vehicle manufacturers use
for the friction materials, any one happen to know?
[Edited on 16/7/08 by liam.mccaffrey]
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liam.mccaffrey
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| posted on 16/7/08 at 07:54 PM |
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never mind just found this
"An exclusive traction oil is used for lubricating the system; when this oil between the disc and power roller is placed under high pressure,
its viscosity rises momentarily. As the oil becomes more viscous under pressure, it becomes harder, and transmits the power by the shearing
force"
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smart51
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| posted on 16/7/08 at 09:36 PM |
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I heard about this oil a few years ago. After many thousand test miles, the CVT was taken apart and the original machining marks were still visible
on the rollers. Pretty low wear then.
I believe the fluid is similar to that in viscous couplings and LSDs.
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britishtrident
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| posted on 17/7/08 at 10:39 AM |
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CVT always works on under test but n the hands of users they don't last long.
Austin were the first to sell a cvt car way back in the late 1920s.
I remember when the current compression steel belt CVT automatics were first introduced the manufacturers trumpeted how great they were, turned out
40,000 miles is about the most you can expect it to last without a strip down --- at least with the DAF rubber band version they were easy to fix.
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