Patent ID: 7255018

Claim:
A transmission ( 1 ) having at least one transmission input shaft ( 4 ), at least one counter shaft ( 5 ), one reverse gear shaft ( 30 ) and at least one transmission output shaft ( 6 ) in which, upon the at least one transmission input shaft ( 4 ) and the at least one countershaft ( 5 ) idler gear wheels ( 13 , 14 , 19 , 20 , 24 , 25 , 26 , 27 ), designed as helical-cut spur gears, are rotatably supported and fixed gear wheels ( 15 , 16 , 17 , 18 , 21 , 22 , 28 , 29 ) are fastened for forming gear pairs with each other, and having shifting sets ( 32 , 33 , 34 , 35 ) situated upon the transmission input shaft ( 4 ) and the countershaft ( 5 ) and comprising synchronization and coupling devices by which the idler gear wheels ( 13 , 14 , 19 , 20 , 24 , 25 , 26 , 27 ) can be decelerated to implement a ratio change operation and can be non- rotatably connected respectively coordinated with the transmission input shaft ( 4 ) or the countershaft ( 5 ), at least one driven gear wheel ( 23 ) upon the at least one countershaft ( 5 ) meshes with teeth of a fixed gear wheel ( 38 ) on the at least one transmission output shaft ( 6 ), and wherein helix angles ( 39 , 40 , 42 , 43 ) of the toothing of the fixed and idler gear wheels ( 21 , 22 , 24 , 25 ) are positioned axially opposing one another on either side of the driven gearwheel ( 23 ) driving the countershaft ( 5 ), and a further helix angle ( 41 ) of the driven gear wheel ( 23 ) and the helix angles ( 39 , 40 , 42 , 43 ) of the fixed and idler gear wheels ( 21 , 22 , 24 , 25 ) are selected so that axial forces, generated by the helix angles ( 39 , 40 , 42 , 43 ) of the fixed and idler gear wheels ( 21 , 22 , 24 , 25 ) and acting upon the countershaft ( 5 ) during operation of the transmission, substantially cancel each other out.