MOTOR VEHICLE AUTOMATIC TRANSMISSION AND RELATIVE ACTUATING METHOD

摘要

In a motor vehicle automatic transmission, a gear (9) is locked angularly to a shaft (7) of the transmission by a synchronizing device (13) having a sleeve (15) which is 5 moved axially, by an actuating device (35) and along a toothless synchronizing ring (24), to and from a work position in which the sleeve (15) is connected in angularly fixed manner to both the shaft (7) of the transmission and the gear (9); and a control device (30) 10 determines and compares the rotation speeds (n1, n2) of the sleeve (15) and the gear (9), and commands operation of the actuating device (35) of the sleeve (15) as a function of the difference between the rotation speeds (n1, n2).