Gearbox a double synchronizer comprising at least two secondary shafts, and by a change of ratio rising and falling associated

摘要

The present invention relates to a box (4) of the speeds of the manually controlled type comprising a primary shaft (7) intended to be connected to a motor (2), and at least two secondary shafts (8.1, 8.2) intended to be connected to the wheels (5) of the vehicle. The primary shaft (7) is connected to the two secondary shafts (8.1, 8.2) via the gears forming the speed ratios. The two secondary shafts (8.1, 8.2) are connected to the wheels (5) via a bridge (6). In the invention, a synchronizer (29) is associated with a high ratio, and a second synchronizer (30) is associated with an intermediate.