A cone-and-belt cvt works like the pulley stacks in a drill press
drive. Only, instead of two sets of pulleys, you have two cones and a
mechanism to keep the belt taut on those cones. Move the belt one way
and you get more torque, less speed. Move it the other, you get more
speed, less torque.
-Bill Hamilton
On May 16, 2010, at 9:34 AM, Clark Ward Jr <[email protected]> wrote:
Thanks, my Bosch blue book doesn't have a lot of detail on how exactly
a CVT works, only something about a band that moves between two
cones.... I will find a book that explains it someday. But I agree,
anytime someone claims an 'order of magnitude' efficiency improvement,
it's time to be skeptical.
On Sun, May 16, 2010 at 7:40 AM, Ben Holko <[email protected]> wrote:
A CVT should not slip, if it does it has too much torque put
through it. A 'la it WILL slip if you put more torque through than
it can handle. Having said that, there is friction there which is
what is stopping it from slipping, while this geared approach has
(basically) no friction. Think of it like the gears of a manual
gearbox, with the variability of a CVT.
Ben
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Clark Ward Jr
Sent: Sunday, 16 May 2010 9:26 PM
To: [email protected]
Subject: Re: [TANKS] Absolute genius
Aren't CVTs less efficient than geared transmissions, given that
they are slipping the whole time? Or do I misunderstand the
technology vis-a-vis the slipping belt and the cones of a CVT?
On Sat, May 15, 2010 at 10:26 PM, Don Shankin <[email protected]>
wrote:
On Sat, May 15, 2010 at 7:19 PM, Ben Holko <[email protected]> wrote:
http://www.youtube.com/watch?v=F6zE__J0YIU
This thing may revolutionize all transmissions.
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Nice concept. I'm glad they addressed my concern of having to power
the second shaft. I was on board until he said he estimated it to
be
an _order of magnitude_ more efficient than the current CVT
transmissions (not geared transmissions, but CVTs even!). We'll see
where this ends up when you figure in powering that second shaft.
I'm
guessing (with no facts or numbers whatsoever) that it will be on
par
with losses associated with a torque converter (which may be OK
because at the end of the day this thing is still a high-torque
CVT).
-Don "I'm a computer engineer not a mechanical engineer" Shankin
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Clark in Georgia
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Clark in Georgia
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