The basic principle

A gear according to the invention comprises several "e;toothings"e; (one tooth or several teeth) which form together a single gear.
There is always such a toothing which is engaged on the secondary gear and another one which is free. This free toothing is synchronized just before being engaged on the secondary gear. This synchronization consists in shifting angularly the toothing, in order to avoid teeth conflicts.

These toothings can be juxtaposed laterally (left) or be located in the same plane (right).
In the second case, there are for example three toothings which each have only one tooth (shown in red). This tooth which transmits the torque can change radius, while the circularity of the secondary shaft (here a belt or a chain) is obtained by V-belt pulley.

The invention also makes it possible to produce an epicyclic gearing which has a variable sun diameter.

Depending on the diameter variation of the red variable-diameter gear, the satellite carrier (green) rotates in either direction. Thatís why the reverse gear may become native.
When the radius of the sun is equal to the radius of the crown, the transmission ratio is either zero or infinite. Thatís why the clutch or the brake may also become native.

Next page: How it works