Gear Set
| Sliding sleeve (reverse gear) | Reverse idler gear | 6th idler gear | |||
| Output shaft fixed gear 2 | Internal shaft | Hollow shaft | |||
| Output shaft fixed gear 1 | 4th idler gear | 2nd idler gear | |||
| 1st idler gear | Sliding sleeve (1st gear/5th gear) | 5th idler gear | |||
| Hollow shaft fixed gear (4th gear/6th gear) | Hollow shaft fixed gear (2nd gear/reverse gear) | Internal shaft fixed gear (1st gear) | |||
| Internal shaft fixed gear (3rd gear) | Internal shaft fixed gear (5th gear/7th gear) | 7th idler gear | |||
| Sliding sleeve (3rd gear/7th gear) | 3rd idler gear | Output shaft 1 | |||
| Output shaft 2 | Spur gear (pinion differential) |
The engine torque is transferred from the crankshaft of the engine to the two-mass drive plate and on to the internal shaft or hollow shaft of the dual clutch transaxle depending on whether K1 clutch or K2 clutch is engaged. The dual clutch acts as an interface between the engine and transaxle and allows uninterrupted torque transfer during shift operations. The odd gears 1, 3, 5 and 7 are engaged via K1 clutch, the even gears 2, 4 and 6 as well as reverse gear are engaged via K2 clutch. Transfer of the drive torques from the clutches to the internal or hollow shaft takes place via the positive connection of the toothed profiles. The driver forces are transferred depending on the requested gear to output shafts 1 and 2 and on to the pinion differential via gear connections which can be engaged via the hydraulically operated internal shift mechanism.
Due to the location of the shafts and the compact gear set, it was possible to keep the dimensions of the transaxle housing small, both in terms of height and width. Despite the small installation space, seven forward gears and one reverse gear are provided.
The following components form part of the gear set:
- Internal shaft with three fixed gears and one sensor rotor
- Hollow shaft mounted on a needle roller bearing with two fixed gears and one sensor rotor
- Two output shafts with idler gears and synchronizers, each with a fixed gear, one park pawl gear (output shaft 1 only)
- Pinion differential with spur gear
Torque transfer takes place on alternating basis via K1 clutch (outer multidisk clutch) and K2 clutch (inner multidisk clutch). A "sub transaxle" is assigned to each clutch.
On sub transaxle 1 (gears 1, 3, 5 and 7) power flow takes place via the corresponding fixed gear of the internal shaft to the associated output shaft idler gears, and on sub transaxle 2 (gears 2, 4, 6 and reverse gear) via the fixed gear of the hollow shaft to the associated output shaft idler gears. During driving operation, only one "sub transaxle" is ever transmitting power.
All gears which are splined together with the respective shafts without the synchronizer engaged are designated fixed gears. The gears of gears 1-7 and reverse gear are idler gears which can be braked by synchronization devices and positively connected to the respective output shaft.