05-21-2010, 01:31 PM
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#1 (permalink)
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My Goal: 35 MPG All Day
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Epic New Transmission? No Friction! Is it perfect?
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05-21-2010, 01:54 PM
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#2 (permalink)
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EcoModder
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This is how the Prius' transmission works (at least to the best of my understanding). A large set of planetary gears with two inputs for variable outputs. His is way more complex... Yes there is friction. It's great, but not "perfect".
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05-21-2010, 03:09 PM
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#3 (permalink)
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Moderate your Moderation.
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There has to be friction. Without friction, movement would not be occuring.
Always remember equilibrium. Friction is both a proponent and an opponent to movement.
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05-21-2010, 03:13 PM
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#4 (permalink)
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Moderate your Moderation.
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Notice how he says there are no "friction components"... not zero friction. Good point to pay attention to.
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05-21-2010, 05:11 PM
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#5 (permalink)
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Master EcoModder
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Epic?
I watched the video.Thanks! I couldn't get the audio portion,so I'm not sure what the claim is.
A few things that strike me:
---- All spur gears,very noisy
---- low rpm
---- no lubrication
---- The elliptical element would have some interesting dynamic balance issues
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05-21-2010, 05:44 PM
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#6 (permalink)
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...beats walking...
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..."wasted" energy spinning the opposite gearing...not good efficiency.
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05-22-2010, 12:15 AM
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#7 (permalink)
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Straight (non-helical) gears cannot have all that great efficiency. Helical gears are better, but there are still losses. The Borg Warner that is used in the Tesla and in the Aptera is ~98% efficient, which is top notch.
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05-22-2010, 12:18 AM
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#8 (permalink)
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Moderate your Moderation.
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Guys, I think we're over-analyzing the video a bit... keep in mind, that video was just to show how the thing worked... clearly, it was far from even a prototype or testing version. It was like the things at the hospital that show how a person's guts work... obviously, they're not real guts. 
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05-22-2010, 01:24 AM
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#9 (permalink)
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I think thats pretty cool. I hope he gets a prototype into a car for some demonstrations.
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05-23-2010, 10:49 AM
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#10 (permalink)
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That's very similar to a Prius transmission. The only real difference is the use of something other than "motor generator #1" to control the speed of shaft #2 (ring gear speed). Changing the names and configuration a little bit does not make it a new invention. It's Toyota's transmission.
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