45
Gear set
The gear set is identical to that of the 0BK gearbox as described in
SSP 457 (page 26 .) The eight forward gears and reverse gear are
realised by linking four simple single-web planetary gear sets. The
two front gear sets have a common sun gear. Output is via the
planetary carriers of the fourth gear set.
The shift matrix on page 46 depicts the interaction of the shift
elements and the converter lockup clutch in the various operating
modes of the hybrid drive.
These operating modes, e.g. drive by electric motor or drive by
internal combustion engine, are controlled via separation clutch K0.
The separation clutch K0 is a dry plate clutch and is engaged in the
idle state. It works in exactly the same way as the starting clutch of
a manual gearbox. The separation clutch couples the blue-coloured
components in the diagram, which are connected to the internal
combustion engine, to the dark-red-coloured components, which
are connected to the e-machine. The separation clutch K0 is actu-
ated via the separation clutch actuator V606. The shift states of
clutch K0 are also shown in the shift matrix on page 46.
Shift elements
649_083
Start-up
As is the case with a standard automatic gearbox, the torque
converter is utilised for start-up. The torque output to the con-
verter lockup clutch by the e-machine or the internal combustion
engine is transferred to the gearbox input shaft by the converter.
The use of the converter for start-up protects the shift elements
and the ATF which, as a result, lasts for the life cycle of the
gearbox. It is not necessary to change the ATF. In addition, the
torsional vibration of the internal combustion engine is insulated
by the converter, and is not transmitted to the gearbox.
Five shift elements shift eight gears. The separation clutch K0
couples the internal combustion engine to the e-machine. The
converter lockup clutch prevents converter slip and increases the
eciency of the automatic gearbox.
• 2 multi-disc brakes (A and B)
• 3 multi-disc brakes (C, D and E)
• 1 converter lockup clutch
• 1 separation clutch K0, dry plate clutch
Shift elements A, B, C, D and E as well as the converter lockup
clutch are activated by the mechatronic module and closed hydrau-
lically (refer to page 56).
The operating principle of the shift elements and the converter
lockup clutch, e.g. resetting and dynamic pressure equalisation, is
described in SSP457 and is identical to that of the 0BK and 0BL
gearboxes. The individual gears are obtained by using 3 closed shift
elements of groups A, B, C, D and E.
Pump drive hub with spline
Planetary carrier PT4 forms a unit with
the gearbox output shaft, the parking
lock gear and the sender disc for the
gearbox output speed sender G195
Gearbox output shaft, primary drive
PT1 H1 H2 P2
H3
PT3
P3
S4
P4
H4
P1 RS2
RS3
RS4
S3
RS1 S1/2 PT2
Clutch E
Clutch C
Clutch D
Parking lock gear
Brake B
Brake A
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