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Old 04-23-2013, 06:14 AM
 
1 posts, read 1,288 times
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[url=http://www.youtube.com/watch?v=nVvhbIfR61E]Gear CVT - YouTube[/url]
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Old 04-23-2013, 07:41 AM
 
Location: Walton County, GA
1,247 posts, read 2,681,423 times
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I wonder how much energy is lost through all the gearing?

I like it though, looks like it would offer smooth ratio changes unlike the belt driven automotive CVT's.
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Old 04-23-2013, 08:46 AM
 
Location: Twin Lakes /Taconic / Salisbury
2,256 posts, read 3,395,304 times
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Alot of people say Toyota hybrids have a CVT transmission in reality the way the ICE and electric motors are blended together in a planetary gear set in their Power Split Device, an intergral part to their Hybrid Synergy Drive , IT ACTS like a gear driven CVT.

Toyota Prius - Power Split Device
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Old 04-23-2013, 08:53 AM
 
2,341 posts, read 8,736,750 times
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What's crazy is that they've had "constant velocity transmissions" in farm equipment for decades. Two pulleys, with a belt running between them. One pulley narrows & increases in circumference in direct proportion to how the second pulley widens and decreases in circumference. An extremely simple concept, and ruggedly reliable. John Deere used to use the same mechanism in their old garden tractors.

For the most part, these "variators" have been replaced by hydrostatic transmissions.

Automotive engineers could use the exact same concept, if they wanted to. I have to wonder if part of the reason they don't is that there would be no transmission shops doing $3,000 rebuilds on them.
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Old 04-23-2013, 09:40 AM
 
Location: anywhere but Seattle
1,082 posts, read 1,806,174 times
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Oh good thats what we need, a slushbox that brings its own set of first order vibrations to the party.
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Old 04-23-2013, 09:52 AM
 
Location: Twin Lakes /Taconic / Salisbury
2,256 posts, read 3,395,304 times
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Spoken like a true poser with no mechanical background..
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Old 04-23-2013, 09:52 AM
 
Location: Chicago
38,691 posts, read 86,953,393 times
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Quote:
Originally Posted by GarageLogic View Post
Automotive engineers could use the exact same concept, if they wanted to. I have to wonder if part of the reason they don't is that there would be no transmission shops doing $3,000 rebuilds on them.
So wait, you think the car makers and transmission shops are in cahoots with each other or something?
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Old 04-23-2013, 10:01 AM
 
2,341 posts, read 8,736,750 times
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Quote:
Originally Posted by Drover View Post
So wait, you think the car makers and transmission shops are in cahoots with each other or something?
I don't believe I said that. However, there's absolutely no question that they could make cares that are a whole lot less complicated, and less expensive to repair - IF they wanted to.
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Old 04-23-2013, 10:12 AM
 
Location: Chicago
38,691 posts, read 86,953,393 times
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Quote:
Originally Posted by GarageLogic View Post
I don't believe I said that. However, there's absolutely no question that they could make cares that are a whole lot less complicated, and less expensive to repair - IF they wanted to.
A whole lot of that complexity, particularly in the drivetrain, is designed to meet government mandates while also meeting consumer expectations. So no, they can't just make cars a whole lot less complicated if they wanted to. And no, they are not deliberately making transmissions complicated so that transmission shops can do $3,000 repairs. That's inane.
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Old 04-23-2013, 10:12 AM
 
Location: anywhere but Seattle
1,082 posts, read 1,806,174 times
Reputation: 975
Quote:
Originally Posted by GarageLogic View Post
I don't believe I said that. However, there's absolutely no question that they could make cares that are a whole lot less complicated, and less expensive to repair - IF they wanted to.


Now tell us how the car manufacturers are in cahoots with space aliens.
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