Patent ID: 7267022

Claim:
A multi-speed transmission ( 1 ), of countershaft design for a double clutch transmission, having a main countershaft ( 9 ) and a hollow countershaft ( 12 ) arranged concentrically thereto, and having two load-shift elements ( 2 , 3 ), in which a first half of the load-shift elements ( 2 , 3 ) is in active connection with a drive unit and a second half of the load-shift elements ( 2 , 3 ) is connected to respective first and second gearbox input shafts ( 5 , 6 ), and the first and the second gearbox input shafts ( 5 , 6 ) and the main and the hollow countershafts ( 9 , 12 ) are mounted in a housing ( 16 ) and are actively connected to gear wheels ( 7 , 8 , 9 B to 9 E, 10 , 11 , 12 A, 13 A to 13 E), which respectively intermesh in pairs as gear wheel pairs (ZP 1 to ZP 7 ) and can be either connected or disconnected in order to reduce an overall gear ratio of a power flow, the main countershaft ( 9 ) is mounted directly on the housing ( 16 ) via a first bearing mechanism ( 15 ) in an area of a first end and in the hollow countershaft ( 12 ) via a second bearing mechanism ( 17 ) and a third bearing mechanism ( 18 ) in an area of a second end, while the hollow countershaft ( 12 ) is mounted directly in the housing ( 16 ) via a fourth bearing mechanism ( 19 ) in an area end that faces toward the second end of the main countershaft ( 9 ) that is mounted in the hollow countershaft ( 12 ), the first gearbox input shaft has a fixed gear wheel which permanently meshes with a fixed gear wheel of the hollow countershaft ( 12 ), the second gearbox input shaft ( 6 ) has a fixed gear wheel which permanently meshes with a fixed gear wheel of the main countershaft ( 9 ), and the hollow countershaft ( 12 ) and the main countershaft ( 9 ) each has at least one fixed gear which permanently meshes with respective gear wheels of a gearbox output shaft ( 13 ).