Power Flow In Reverse Gear

Component Illustration:

Principle Of Power Flow In Reverse Gear:
Torque from the torque converter is increased via the propeller shaft (1) and all three planetary gearsets and transferred with reversed direction of rotation to the output shaft (5).

Front Planetary Gearset:
The ring gear (V4) is driven by the propeller shaft (1). The sun gear (V1) is held against the housing by the locked freewheel F1 during acceleration and via the engaged multiple-disc brake B1 during deceleration. The planet gears (V2) turn on the fixed sun. gear (V1) and increase the torque from the ring gear (V4) to the planet carrier (V3). The planet carrier (V3) moves at a reduced speed in the running direction of the engine.

Rear Planetary Gearset:
The planet carrier (H3) is held against the housing by the engaged multiple-disc brake B3. The ring gear (H4) turns at a reduced speed due to the mechanical connection to the front planet carrier (V3). The planet gears (H2) turn between the ring gear (H4) and the sun gear (H1). The direction is reversed by the held planet carrier (H3) so that the sun gear (H1) turns in the opposite direction to the running direction of the engine.

Center Planetary Gearset:
The ring gear (M4) is held against the housing by the multiple-disc brake B3 via the mechanical connection to the planet carrier (H3). The sun gear (M1) turns backwards due to the engaged multiple disc clutch K3. The planet gears (M2) turn on the fixed ring gear (M4) and increase the torque from the sun gear (M1) to the planet carrier (M3). The output shaft (5) connected to the planet carrier (M3) turns at a reduced speed in the opposite direction to the running direction of the engine.

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