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How Automatic Transmission Works
Press buttons below to see different working mode.
This is Flash animation of Automatic transmission. Automatic transmissions use planetary gear system to operate.
Fallowing descriptive images are taken from Garagevitesse web site
Deceleration
Power input: ring gear Power output: planetary carrier
Stationary: sun gear
When the sun gear is held stationary, only the
pinion gear rotates and revolves. Therefore, the
output shaft decelerates in proportion to the input
shaft only by the rotation of the pinion gear.
Direct Coupling
Power input: sun gear, ring gear Power output: planetary carrier
Ring gear rotates with the locked planetary carrier,
the input and output shafts rotate at the same rate.
Reverse Rotation
Power input: sun gear Power output: ring gear
Stationary: Planetary carrier
When the planetary carrier is fixed in position and
the sun gear turns, the ring gear turn on its axis
and the rotational direction is reversed.
HINT:
The reference uses a model to explain the
operation using different input and output shafts. In
an actual vehicle, the construction is more complex
in order to enable the planetary gear unit to
appropriately shift gears, as shown by the left
diagram.
