Here's a great explanation using a model: https://youtu.be/MsvVD0FaF28 https://youtu.be/MsvVD0FaF28 The amazing thing about them is that they have no parts th

Here's a great explanation using a model: https://youtu.be/MsvVD0FaF28 https://youtu.be/MsvVD0FaF28 The amazing thing about them is that they have no parts that need friction to work like belts, CVT axles or even the clutch. Nor do they have any moving parts like a regular transmission which shift into place. It's 2 electric motors connected via a planetary gearset to the ICE. Nothing can get out of alignment or get loose.