This week I'd like to raise your attention for a CVT (Continuously Variable Transmission) design, made by Sheepo.
It features a continuous transmission ratio that goes from 1:0,5 (minimum) to 1:2 (maximum).
A continuously variable transmission, is a transmission that can change steplessly through an infinite number of effective gear ratios between a maximum and minimum values.
The system consists usually of a conical pulley system connected through a belt element, and moving this element along the cones you can change the transmission ratio in infinite positions.
It was very ingenious the way Sheepo imagined to implement the conical elements and how he also replaced the belt (difficult to effectively with LEGO) with one tire.
Here the video that demonstrates how it was achieved with LEGO elements.
Below also the bottom view and the tire module, that let you better understand how does it works.
You may find additional information and images, at Sheepo's Garage blog, and from his Brickshelf folder.
For the step-by-step building instructions you may download from here.
To finish I'll let you with another smart transmission design by Sheepo. This time a modular Planetary gearbox.
More information, here.