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02-09-2007, 12:39 AM | #1 | |
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Zeroshift Automated Manual Transmission could be an automotive killer app
Zeroshift Automated Manual Transmission could be an automotive killer app
http://www.gizmag.com/go/6807/ Quote:
http://www.hbm.com/custserv/SEURLF/A...nearticles.htm
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02-09-2007, 01:36 AM | #2 |
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02-09-2007, 01:43 AM | #3 |
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Zone of the Enders anyone?
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02-09-2007, 01:52 AM | #4 |
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old news, but still important
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02-09-2007, 02:13 AM | #5 |
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Umm... doesn't a CVT basically do the same thing? but better??
can it handle more torque than a CVT? |
02-09-2007, 03:05 AM | #6 |
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cvt does a similar thing but in a different way. this has multiple gears, instead of just one "gear" that varies in size. its more complicated than that, but if you read the website it explains it all.
looks very promising, once they get the design smoothed out and production ready. |
02-09-2007, 10:56 AM | #7 |
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I first heard of Zeroshift about two years ago. Indeed, it truly has the potential to revolutionize transmission technology (including DSG). From what i remember, it's actually enormously strong. We're talking about a DSG-style transmission with the strength of a race dogbox. And unbelievably fast shift times.
From what i remember, the only hurdles they were facing with it is making it quieter and smoother. Before i think each shift was rather loud and somewhat jerky due to the speed with which it engages. |
02-09-2007, 11:28 AM | #8 |
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how the flip does this work? the website needs a login.. i too lazy to register .
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02-09-2007, 11:46 AM | #9 |
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I don't think it needs a login... but as I understand it, it basically allows two gears to be engaged at the same time via two sets of dog teeth that move independently. At first, both sets lock down on one gear, locking it to the output shaft in both directions. When you shift, though, the "overridden" dog teeth (the ones without load on them because the engine is assumed to be providing motive power and not braking power) lift off the first gear and lock onto the second gear. However, as soon as the higher gear is engaged, the resultant higher speed of the output shaft overrides the lower gear that was selected, taking the load off those dog teeth that were still engaged to the first gear and allowing them to flip to the other side too, locking the shaft to the new gear in both directions.
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02-09-2007, 12:10 PM | #10 |
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02-09-2007, 12:23 PM | #11 |
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02-14-2007, 09:13 PM | #12 |
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http://www.hbm.com/company/apps/SEUR...E/app_view.htm
That has an ok explanation of how it works. Or go to zeroshift.com This is a great idea, but unless its coupled with another system, you will still need a clutch or torque converter for 1st gear take off. Downshifts would be awkward and jerky too. Great idea, needs codevelopment to make it work though (ie car manufacturer) and wont be plausible without big bucks. |
02-15-2007, 07:49 AM | #13 | |
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Sorry to get your panties in a bunch back then.. |
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02-15-2007, 09:06 AM | #14 |
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Downshifts should work just as smoothly. Only one of the two "bullets" is engaged with the dog teeth at any given time. If you're accelerating, its on one set of bullets if you're deccelerating its on the others. Whether its an upshift or downshift you move the bullets not under load. As soon as the next gear is engaged (up or down) the other bullets will be kicked out of engagement and can be moved into position if on the next gear (where they will not be under load unless deccelerating).
I think that since the diagram only shows gears one and two, people don't understand that there are bullets on both sides of gear two. |
02-15-2007, 09:44 AM | #15 |
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02-15-2007, 05:26 PM | #16 | |
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Quote:
I read an article that suggested maybe using a slipper clutch to bandaid that problem, but I've never heard of a slipper clutch being able to able to hold anything more than 75 ft/lbs of torque. Maybe an entirely new method of careful modulation on the gas to nullify any load in either way could resolve the issue. |
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02-15-2007, 11:39 PM | #17 |
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So how is this an update over two years ago?
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02-16-2007, 07:32 AM | #18 |
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I hate this stuff.
its always AMAZING developments but they never actually make it to the market. just like the stupid auto makers and their "prototypes". any time you see the "prototype" word you have to forget about the car. same with this crap. people say its been 2 years now and nothing. They never make it pass the "great concept" part. I remember an article in "popular science" or some mag where someone came out with transparent aluminum, as clear as glass. They said they would use it on car pillars. that was like 7 or 8 years ago and NOTHING. |
02-19-2007, 08:39 AM | #19 |
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I don't know about the transparent aluminum, but Zeroshift is going to the upcoming SAE conference to promote their item. They need funding to make this concept true. Only manufacturers could afford to push this item.
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08-06-2009, 12:08 PM | #20 | |
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Quote:
The cars are already drive by wire so have the ECU blip the throttle for downshifts and create some sort of "shaft brake" to slow down the engine RPM quickly for upshifts. |
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