Multi-speed transmission device particularly for motor vehicles

摘要

The device has an upstream shaft (2) connected to an engine (3) and a downstream shaft (4) connected to a differential (6) via two power paths (8a, 8b) defining different transmission ratios. Selective activation units (18a, 18b) for the ratios are provided on respective paths. The shaft (2) is in permanent connection with respective input units of each path. The activation units adjust the rotational speed between the shafts during ratio change.