Change-speed gears for engine and transmission mechanism units

Claim 1

A TRANSMISSION BOX FOR VEHICLES INCLUDING AN ENGINETRANSMISSION UNIT COMPRISING A DIFFERENTIAL AND, AT THE SIDE OF SAID DIFFERENTIAL OPPOSITE OF THE ENGINE, A CHANGESPEED BOX HAVING AN OUTLET SHAFT AND AN INPUT SHAFT INSIDE THE OUTLET SHAFT, SAID OUTLET SHAFT BEING DRIVINGLY CONNECTED TO THE DIFFERENTIAL, A FIRST AND A SECOND CLUTCH HAVING A COMMON INPUT ELEMENT AND EACH AN OUTPUT ELEMENT, A FIRST AND SECOND EPICYCLIC TRAIN EACH HAING A FIRST, SECOND AND THIRD ELEMENT ROTATING ABOUT THE AXIS OF THE TRAIN AND INTERCONNECTED BY SATELLITES, THE INPUT ELEMENT OF SAID CLUTCHES BEING CONNECTED AT THE FREE END OF THE INPUT SHAFT THAT TRAVERSES AXIALLY THE SAID EPICYCLIC TRAINS, THE OUTPUT ELEMENT OF THE FIRST CLUTCH COMPRISING A SHAFT SURROUNDING THE SAID INPUT SHAFT AND CARRYING THE FIRST ELEMENT OF THE FIRST EPICYCLIC TRAIN FORMING A SUN GEAR, THE OUTLET SHAFT OF THE SECOND CLUTCH COMPRISING A SHAFT SURROUNDING THE SAID OUTPUT SHAFT OF THE FIRST CLUTCH AND CARRYING THE FIRST ELEMENT OF THE SECOND EPICYCLIC TRAIN FORMING A SUN GEAR, THE SECOND ELEMENT OF THE FIRST TRAIN FORMING A SATELLITE SUPPORT BEING CONNECED FOR ROTATION TO THE OUTLET SHAFT AND CARRYING TWO SATELLITE GROUPS MESHING WITH EACH OTHER, ONE OF SAID GROUP MESHING WITH THE FIRST ELEMENT OF SAID EIPCYCLIC TRAIN AND THE OTHER GROUPS MESHING WITH THE THIRD ELEMENT OF SAID TRAIN WHICH IS CONNECTED FOR ROTATION TO THE SECOND ELEMENT OF THE SECOND EPICYCLIC TRAIN FORMING A SATELLITE SUPPORT, THE THIRD ELEMENT OF THE SECOND EPICYCLIC TRAIN BEING CONNECTED FOR ROTATION TO AN ELEMENT OF THE FIRST EPICYCLIC TRAIN OTHER THAN THE SAID THIRD ELEMENT OF SAID TRAIN, A FIRST BRAKE COOPERATING WITH THE SATELLITE SUPPORT OF THE SECOND EPICYCLIC TRAIN AND A SECOND BRAKE COOPERATING WITH THE OUTPUT ELEMENT OF THE SECOND CLUTCH, SAID BRAKES AND CLUTCHES BEING SELECTIVELY OPERABLE FOR OBTAINING A TRANSMISSION COMPRSING A PLURALITY OF SPEEDS AND A REVERSE SPEED.