INTERNAL COMBUSTION ASSIST MEANS FOR A BICYCLE

摘要

Pedalling assist device for a lightweight vehicle, in particular a bicycle, equipped with pedals and with a gear change transmission, this device comprising an internal combustion engine (1; 101; 201) equipped with a reduction unit mechanically coupled to an element (26, 46; 146; 227) receiving muscular pedalling power from a user of the lightweight vehicle, the mechanical coupling taking place upstream of said gear change transmission such that the internal combustion engine benefits from said gear changes, characterized in that the reduction unit of the internal combustion engine comprises a first belt reduction stage (6; 286).