MULTI-STEP REDUCTION GEAR FOR MOTOR VEHICLES

摘要

A multi-step reduction gear for motor vehicles has a first gear (12) and a second gear mounted side by side on a common shaft. Synchronization means for adjusting the speeds of the gears (12) are provided between the gears (12) and slide axially with respect thereto. An actuating element of the synchronization means rotates with the first gear (12). Said element can be turned with respect to the latter only through a limited peripheral section (u) andhas a peripheral friction surface which can be brought by axial sliding into frictional engagement with a counter-friction surface of the second gear. To permit synchronized shifting processes with constant shift time which are independent of the manually applied shifting effort, the actuating element has a first wedge face (51, 51') set at an angle to a radial plane, which rests against a corresponding second wedge face (41, 41') rigidly connected to the first gear (12). In this way, when frictional engagement occurs, the actuating element is subjected to an axial force which is directed toward the counter-friction surface (31).