Dual Clutch Transmission, Power Flow - GF27.10-P-3100KJ
TRANSMISSION 700.4 in model 453.0/3/4
Function requirements for dual clutch transmission power flow, general
- Circuit 15 ON
- Internal combustion engine running
- Transmission control not in limp-home mode
Dual clutch transmission power flow, general
The engine torque is transferred from the crankshaft of the combustion engine to the two-mass flywheel and (depending on whether clutch (dual clutch) is engaged) further to either the internal shaft or the hollow shaft of the dual clutch transmission. The dual clutch serves as the interface between the two major assemblies and permits virtually interruption-free torque transfer during shift operations. Odd gears 1, 3 and 5 are engaged using a clutch; the even gears 2, 4 and 6 as well as the reverse gear are engaged using the other clutch.
The drive torques from the clutches are transferred to the internal shaft and hollow shaft positively via ring gear profiles. Gear connections transfer the driving power to output shaft 1 and 2 (depending on gear requested) and onto the bevel gear differential.
All gear wheels that are non-rotatably connected to the relevant shafts with synchronization disengaged are referred to as fixed gears.
Dual clutch transmission, power flow
The function sequence is described in the following steps:
- Power flow in 1st gear, function sequence
- Power flow in 2nd gear, function sequence
- Power flow in 3rd gear, function sequence
- Power flow in 4th gear, function sequence
- Function sequence for power flow in 5th gear
- Function sequence for power flow in 6th gear
- Power flow in reverse gear, function sequence
Power flow in 1st gear
Power flow in 1st gear, function sequence
The following mechanical components are engaged or actuated for the power flow in 1st gear:
- Shift fork 1 (1st gear/5th gear)
- Multiple cone synchronization
The torque is transferred from the internal shaft fixed gear (12) of the internal shaft (1) to the 1st gear idler gear (16) of output shaft 1 (3). The output torque is transferred from the output shaft 1 fixed gear (19) to the spur gear (20) of the bevel differential. The bevel gear differential is connected with the complete wheels, which effect the traction of the vehicle, by means of the front drive shafts.
Power flow in 2nd gear
Power flow in 2nd gear, function sequence
The following mechanical components are engaged or actuated for the power flow in 2nd gear:
- Shift fork 2 (2nd gear/4th gear)
- Multiple cone synchronization
The torque is transferred from the hollow shaft fixed gear (13) to the 2nd gear idler gear (17) of output shaft 1 (3). The drive torque is transferred from the output shaft 1 fixed gear (19) to the spur gear (20) of the bevel differential. The bevel gear differential is connected with the complete wheels, which effect the traction of the vehicle, by means of the front drive shafts.
Power flow in 3rd gear
Power flow in 3rd gear, function sequence
The following mechanical components are engaged or actuated for the power flow in 3rd gear:
- Shift fork 3 (3rd gear)
- Multiple cone synchronization
The torque is transferred from the internal shaft fixed gear (11) to the 3rd gear idler gear (6) of output shaft 2 (4). The output torque is transferred from the output shaft 2 fixed gear (9) to the spur gear (20) of the bevel differential. The bevel gear differential is connected with the complete wheels, which effect the traction of the vehicle, by means of the front drive shafts.
Power flow in 4th gear
Power flow in 4th gear, function sequence
The following mechanical components are engaged or actuated for the power flow in 4th gear:
- Shift fork 2 (2nd gear/4th gear)
- Double-cone synchronizer
The torque is transferred from the hollow shaft fixed gear (14) to the 4th gear idler gear (18) of output shaft 1 (3). The output torque is transferred from the output shaft 1 fixed gear (19) to the spur gear (20) of the bevel differential. The bevel gear differential is connected with the complete wheels, which effect the traction of the vehicle, by means of the front drive shafts.
Power flow in 5th gear
Function sequence for power flow in 5th gear
The following mechanical components are engaged or actuated for the power flow in 5th gear:
- Shift fork 1 (1st gear/5th gear)
- Double-cone synchronizer
The torque is transferred from the internal shaft fixed gear (10) to the 5th gear idler gear (15) of output shaft 1 (3). The output torque is transferred from the output shaft 1 fixed gear (19) to the spur gear (20) of the bevel differential. The bevel gear differential is connected with the complete wheels, which effect the traction of the vehicle, by means of the front drive shafts.
Power flow in 6th gear
Function sequence for power flow in 6th gear
The following mechanical components are engaged or actuated for the power flow in 6th gear:
- Dual gearshift fork for 6th gear/reverse gear
- Double-cone synchronizer
The torque is transferred from the hollow shaft fixed gear (14) to the 6th gear idler gear (8) of output shaft 2 (4). The output torque is transferred from the output shaft 2 fixed gear (9) to the spur gear (20) of the bevel differential. The bevel gear differential is connected with the complete wheels, which effect the traction of the vehicle, by means of the front drive shafts.
Power flow in reverse gear
Power flow in reverse gear, function sequence
The following mechanical components are engaged or are actuated for the power flow in reverse gear:
- Shift fork 1 (1st gear/5th gear)
- Dual gearshift fork 4 (for 6th gear/reverse gear)
- Multiple-cone/single-cone synchronizer
The torque is transferred from the hollow shaft fixed gear (13) to the 2nd gear idler gear (17) of output shaft 1 (3). The 2nd gear idler gear (17) is not engaged, i.e. it rotates freely on output shaft 1 (3) and is engaged with the reverse gear idler gear (7) of output shaft 2 (4). It thus serves as a reversing gear and enables reversal of the rotational direction for the reverse gear. The reverse gear idler gear (7) is locked by the 3rd gear idler gear (6) (torque transfer via output shaft 2 (4) does not take place). The 3rd gear idler gear (6) transfers the torque via the internal shaft (1) with the internal shaft fixed gears (11, 12) to the 1st gear idler gear (16) of output shaft 1 (3). The output torque is transferred from the output shaft 1 fixed gear (19) to the spur gear (20) of the bevel differential. The bevel gear differential is connected with the complete wheels, which effect the traction of the vehicle, by means of the front drive shafts.
The output shaft 1 and 2 fixed gears (19, 9) are rigidly connected to the respective output shafts (3, 4). The gearwheels of gears 1 to 6 and of the reverse gear are idler gears which can be braked by the synchronization devices and positively connected to the respective output shaft (3, 4).
| Overview of system components for dual clutch transmission | GF27.10-P-9994KJ |