Clutch
Automated manual transmission
63
Introduction of the smart fortwo, Model Series 451
Clutch motor
General
Model 451 is fitted with a 5-speed automated manual
transmission. This means that a single-plate dry
clutch is installed instead of the torque converter that
is usual with conventional automatic transmissions.
The single-plate dry clutch is actuated by the clutch
motor.
Function
When the automated manual transmission control unit
issues a request for a gear change, the clutch motor
is actuated at the same time. The electric motor inte-
grated in the clutch motor operates the clutch via the
actuating plunger. The power flow is interrupted and
the shift operation can be performed.
P25.19-2010-00
4 Electric motor
5 Electric motor connector
6 Actuating plunger
M18 Clutch motor
SN_Typ 451_us.book Seite 63 Freitag, 30. November 2007 1:56 13
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