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Post by rick1776 on Apr 30, 2003 21:54:49 GMT -5
before it even got tested in anger. Apparently Mac had devised some clever hydraulics that made the gearbox "behave" very much like a contiually variable transmission, CVT, even though they had cogs as per a normal gearbox. Does anyone know more about this??
I know that DAF had a CVT many years ago and it was based on cones and a belt (I think), but the DAF had about 3.2HP.
How would you arrange the hydraulics to act like a CVT. Any gearbox engineers out there.
cheers
rick1776
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Post by pabs on Apr 30, 2003 22:05:06 GMT -5
Maybe if it has a double clutch system you can arrange it in such a way that it can mimick a CVT. But then the problem would be that you wouldn't necessarily be shifting through all the gears which is essentially against the rules.
Or maybe I'm just talking out of my rear end....
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Post by raptor22 on May 1, 2003 7:36:40 GMT -5
Pabs is right, you can achieve that effect with a double clutch system. in effect you could already be engaged in another gear and simply transfer the drive via the 2nd clutchand shift up another gear while th 1st is .basically a continuous waltz between selector teeth and clutches..
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Post by Cine_Man on May 1, 2003 10:04:54 GMT -5
I thought that a multiple clutch was how Ferrari was achieving such miraculously short shift times....
If that were true, its not the nimber of clutches that would be illegal, just the CVT part.
cine_...
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Post by daSilva on May 1, 2003 10:07:13 GMT -5
Subaru also had a CVT on the Justy. It is the ideal solution as you have near constant torque and horsepower. But it is banned in F1.
I wonder if the Ferrari's differential is acting in the same manner as a second clutch.
Rick, what is the source of the story?
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Post by rick1776 on May 1, 2003 19:24:24 GMT -5
daSilva,
It was a short couple of lines in the current F1 racing mag.
cheers
rick1776
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Post by pabs on May 2, 2003 0:00:20 GMT -5
Cine,
I agree that the problem is not the number of cluthes but rather how they operate. If the gearbox is to act like CVT then it will not necessarily shift through the gears sequentially. That might be McLaren's problem. I also remember reading something about Ferrari having a dual-clutch system to achieve very small shift times, but as long as they shift sequentially then I guess there's not problem.
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Post by daSilva on May 2, 2003 7:48:32 GMT -5
Pabs,
I don't believe there is a rule that states the tranny has to be sequential.
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Post by daSilva on May 2, 2003 12:00:19 GMT -5
Rick, Which page I can't seem to find it?  |
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Post by rick1776 on May 3, 2003 10:35:07 GMT -5
daSilva,
Ya had me worried as I couldnt find it initially. Page 113.
cheers
rick1776
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Post by daSilva on May 5, 2003 11:53:11 GMT -5
Hey Rick,
If that is the May or April issue we must have different versions of the magazine, which would surprise me a bit. My page 113 has a lost interview with Jim Clark.
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Post by OT on May 6, 2003 4:22:16 GMT -5
DaSilva
Page 113 of the Aussie version.... LOL!!!
It's in the "Debrief: Malaysia" article....
....just above the silhouettes of the MP4-17 and MP4-17D in "Coming of age delayed for MP4-18A"
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Post by daSilva on May 6, 2003 9:56:51 GMT -5
A ha, Page 126.  I guess you Aussies have less words and more pictures to make the magazine easier for you to "read".  |
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Trickie
Minnow
Elite
The Need For Speed Is All Thats Needed
Posts: 13
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Post by Trickie on May 6, 2003 11:35:12 GMT -5
Hello Peeps......
Williams tested a Van Dorne CVT tranny many years ago at Silverstone, I would guess around 90 or 91. If I remember, it was a development with Renault and it did run for a bit. This was when the FIA banned this type of transmission. It was basicallly a beefed up Escort box in ternals, it was driven by 2 belts around a cone. Ask Sennina if she has any more info.......
Trickie
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Post by daSilva on May 6, 2003 12:14:14 GMT -5
It was '93 and without any development it was about 1 second a lap faster than their manual tranny.
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