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The Honda CIvic has a CVT in it.
One easy way to make a two speed tranny is to use the freewheeling mechanism on the back wheel of a ten speed bike.
(Not the shifter)
when you pedal a ten speed, as long as the wheel is going slower than the pedals, the pedals stay engaged. If you go down a steep hill, and dont pedal faster, then the pedals are just spinning, and the back wheel is going faster, right?
so you could have two separate motors driving a link the same way, with different gear ratios
when you are going slow, both motors will be engaging the wheel, and the high torque motor will be doing most of the work - once the machine gets beyond the top speed of the high torque motor its sprocket will freewheel (like the pedals on your bike) and the high speed motor will take over.
Only drawback, you cant go backwards, unless you add a reverse gear.
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