CVT are rather simple. They operate on a V-belt, which wraps around two cone-shaped pulleys. As the belt moves up or down a pulley, the gear ratio changes, which changes the speed of the drive wheels. This is just like a normal automatic but without any gears at all.
A team of Dutch inventors have invented a new variable transmission system that could very well supplant CVT altogether. It’s called Controlled Rotation System (CRS) and, as you can see in the video below, uses two variable discs to drive a belt.
The diameter of the disc is increased and decreased by a digitally-operated hydraulic pump, according to a Motor Authority report.
Originally designed to do away with chains and gears for bicycles, the inventers say they have modified the system to work in cars, suggesting the CRS is ideal for EVs. With a CRS transmission, an EV electric motor would be allowed to spin at a constant speed while on and rely solely on the CRS to change vehicle speed, thereby reducing wear.
What benefits does a CRS have over a CVT or traditional automatic? The Dutch team insists the system is more efficient, as it creates no friction, requiring no lubrication and therefore requires no maintenance.
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