| The
schematic diagram shows the kinematic layout of the flap
drive system. There are always two actuators (red) acting
on a single flap panel (grey). Two motors (blue) power
the main drive unit (yellow). Between the main drive unit
and the actuators are long flexible shafts (green).
The reduction of the motor
speed happens in several steps. The greatest reduction
happens inside the actuators, so the torque transmitted
by the flexible shafts is very reduced. The main drive
unit has spur gears, while the actuators have worm gears
to drive the ball screw spindles.
A special feature comes
from the fact that the trapezoidal flap panel is actuated
by actuators, all with equal travel. The inequality of
the panel movement is compensated by the link between the
spindle nut and the panel. The only consequence is that
the inner actuators are slightly longer than the outer
actuators, but except that identical. This reduces the
costs.
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