Transmission with low shaft deflection

A transmission (1) comprising:

• at least one transmission input shaft (4), at least one countershaft (5), one reverse gear shaft (30) and at least one transmission output shaft (6);
• a plurality of idler gear wheels (13, 14, 19, 20, 24, 25, 26, 27), designed as helical-cut spur gears, are rotatably supported upon the at least one transmission input shaft (4) and the at least one countershaft (5);
• a plurality of fixed gear wheels (15, 16, 17, 18, 21, 22, 28, 29) are non-rotatably supported upon the at least one transmission input shaft (4) and the at least one countershaft (5) for forming gear pairs with the plurality of idler gear wheels;
• a plurality of shifting sets (32, 33, 34, 35) situated upon the transmission input shaft (4) and the countershaft (5), the shifting sets comprising synchronization and coupling devices by which the idler gear wheels (13, 14, 19, 20, 24, 25, 26, 27) can be non-rotatably connected with one of the transmission input shaft (4) and the countershaft (5);
• at least one driven gear wheel (23) supported upon the at least one countershaft (5) which meshes with teeth of a fixed gear wheel (38) on the at least one transmission output shaft (6) and helix angles (39, 40, 42, 43) of the toothing of the fixed and idler gear wheels (21, 22, 24, 25), and a further helix angle (41) of the driven gear wheel (23) 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;
• and
• wherein on the countershaft (5) first and second gear wheels of the gear wheels (21, 22, 24, 25) axially positioned on a first side of the driven gear wheel (23) each has a right-handed helix angle, and third and fourth gear wheels of the gear wheels (21, 22, 24, 25) each comprises left-handed helix angle axially positioned on a second side of the driven gear wheel (23) to oppose the toothing forces and bending forces of the first and second gear wheels.

A transmission (1) comprising:

• at least one transmission input shaft (4), at least one countershaft (5), one reverse gear shaft (30) and at least one transmission output shaft (6);
• a plurality of idler gear wheels (13, 14, 19, 20, 24, 25, 26, 27), designed as helical-cut spur gears, are rotatably supported upon the at least one transmission input shaft (4) and the at least one countershaft (5);
• a plurality of fixed gear wheels (15, 16, 17, 18, 21, 22, 28, 29) are non-rotatably supported upon the at least one transmission input shaft (4) and the at least one countershaft (5) for forming gear pairs with the plurality of idler gear;
• a plurality of shifting sets (32, 33, 34, 35) situated upon the transmission input shaft (4) and the countershaft (5), the shifting sets comprising synchronization and coupling devices by which the idler gear wheels (13, 14, 19, 20, 24, 25, 26, 27) can be non-rotatably connected with one of the transmission input shaft (4) and the countershaft (5);
• at least one driven gear wheel (23) supported upon the at least one countershaft (5) which meshes with teeth of a fixed gear wheel (38) on the at least one transmission output shaft (6), and helix angles (39, 40, 42, 43) of the toothing of the fixed and idler gear wheels (21, 22, 24, 25) positioned axially opposing one another on either side of the driven gear wheel (23) and a further helix angle (41) of the driven gear wheel (23) 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;
• and
• the idler gear wheels (13, 14) for a sixth gear (G6) and a fourth gear (G4) are positioned on the input shaft (4) closest to a clutch, and the idler gear wheels (19, 20) for a fifth gear (G5) and a seventh gear (G7) are located on an end of the input shaft (4) remote from the clutch.