D-Drive - Infinitely variable transmission
15-05-2010, 21:09
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#1
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Inactive
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D-Drive - Infinitely variable transmission
Ready for a bit of a mental mechanical challenge? Try your hand at understanding how the D-Drive works. Steve Durnin's ingenious new gearbox design is infinitely variable - that is, with your motor running at a constant speed, the D-Drive transmission can smoothly transition from top gear all the way through neutral and into reverse. It doesn't need a clutch, it doesn't use any friction drive components, and the power is always transmitted through strong, reliable gear teeth. In fact, it's a potential revolution in transmission technology - it could be pretty much the holy grail of gearboxes.
http://www.gizmag.com/steve-durnin-d...-geared/15088/
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15-05-2010, 23:10
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#2
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Guest
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Re: D-Drive - Infinitely variable transmission
Very interesting indeed, definately a mind bender lol
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16-05-2010, 00:20
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#3
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Mum 30/09/20 Dad 08/08/24
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Re: D-Drive - Infinitely variable transmission
I know the new BMWs have a dual clutch system,
one for 1st, 3rd & 5th.
one for 2nd, 4th & 6th.
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16-05-2010, 09:27
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#4
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vox populi vox dei
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Re: D-Drive - Infinitely variable transmission
i have some reservations about this
at work i drive a ford transit
if this new drive was fitted how would it grind gears between 3rd and 4th and how would it cope with jumping out of reverse as soon as the wheels turn ?
ford have spent many years putting these refinements into the tranny ,it looks as though they could disappear over night .
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16-05-2010, 13:22
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#5
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Re: D-Drive - Infinitely variable transmission
Quote:
Originally Posted by papa smurf
i have some reservations about this
at work i drive a ford transit
if this new drive was fitted how would it grind gears between 3rd and 4th and how would it cope with jumping out of reverse as soon as the wheels turn ?
ford have spent many years putting these refinements into the tranny ,it looks as though they could disappear over night .
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16-05-2010, 19:02
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#6
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Re: D-Drive - Infinitely variable transmission
It looks like it's just a power combining epicyclic gear train, and shifts the gear varying problem to the secondary power input. Instead of braking an element of the epicyclic train, power is applied to two elements.
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16-05-2010, 19:10
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#7
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Inactive
Join Date: Dec 2007
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Re: D-Drive - Infinitely variable transmission
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16-05-2010, 21:00
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#8
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Re: D-Drive - Infinitely variable transmission
quite an interesting concept i thought
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17-05-2010, 04:23
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#9
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Inactive
Join Date: Jun 2003
Location: NW UK
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Re: D-Drive - Infinitely variable transmission
Maybe it's just me but I am struggling to work out the dynamics or efficiency of this transmission. With a normal transmission you have a single power input, with this you require 3, 2 of which are at 90 degrees to each other. Surely this is going to cause a headache, and again with power transfer, if the 2 shafts are electrically driven from motors on the side of the transmission, where is the massive torque from the input side getting transferred to the output?
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