Gear box for motor vehicle, has jaw clutch device deprived of synchronization unit, unit controlling synchronization of idle pinions till determined intermediate demultiplication gear is attained during rise of intermediate gear, and sensor

摘要

The gear box has a jaw clutch device for a driving pinion (14) and a driven pinion (16) of a determined intermediate gear, where the device is deprived of a synchronization unit. A measurement sensor (44) measures a speed of rotation of the pinion (14). A control unit (48) controls the synchronization of the idle pinions of very high gear till determined intermediary demultiplication gear is attained, in case of passage order rising to the determined intermediate gear. Independent claims are also included for the following: (1) a method for changing of a demultiplication gear of a gear box (2) a motor vehicle comprising a gear box.