What
do you build for the person that has everything? Why a Lego CVT (continuously
variable transmission) of course. This creation was originally built by Nico71,
based on an idea from Zblj's work of a transmission that can constantly change
between gears, thus he created a CVT. Nico expanded on the idea by adding the
Tach's for motor and output speed. Fig 1a shows the rear side of the machine
where all the magic takes place, two 16-24 tooth
differentials are the heart of this machine. Underneath
the differentials are two 24-tooth gears maintaining
a ratio of 1:1.
Fig 3.
Fig 2.
On
top of the 2 differentials is an 8 tooth gear meshing
with a 40 tooth gear,
creating a ratio of 1:5, a pin is
in place next to the 8 tooth gear with a 8 tooth gear on that pin, that
prevents the top gears from turning until resistance is applied, the video
clearly illustrates that at 3:00. Fig 2. shows the two tach's, created using
momentum that throws the arms, which picks up the8L axle with
stop, which is connected to a 7L rack, as the
arms sling out the rack is picked up, which is connected to a 12 tooth double
bevel gear which turns the tach. In Fig 3. is the gearing on top of the
structure for the Tach's, the motor tach and output tach are both geared up
1:1.67, which turns the L motors 270 rpms into 445 rpms on both tach’s. The
video goes over some parts I might have missed here. This is the link to Nico's blog where you can find the pictures on how to build this machine. That’s all
for now, remember if you can dream it, you can build it.
Nico71
has already built one, it’s better than an automatic transmission, it’s better than
a manual transmission, but less complicated. Two differentials are the heart of
this machine, but in the end, what is it? What does it do? Well those are
questions that will not be answered until Friday, let your minds wander, and
remember if you can dream it, you can build it.
