Device for converting torque or rotary movement to another torque or rotary movement according to transmission ratio in electrically assisted bicycle, has synchronization elements arranged such that elements are optimized along zone

摘要

The device has a set of synchronization elements (sA, sC) that is distributed at regular periodicity according to a theoretical diameter. The set of synchronization elements are arranged with a tangency zone and another zone that is diametrically opposed to the tangency zone. The set of synchronization elements are arranged such that the synchronization elements are optimized along a maximum proximity zone. A set of multipolar permanent magnets is inserted in the set of synchronization elements.