Reverse Gear

Fig 1: Identifying Power Flow Schematic - Reverse Gear

Courtesy of BMW OF NORTH AMERICA, INC.

Reverse Gear  - Drive torque is applied to the torque converter impeller and transferred to the turbine. The turbine shaft rotates clockwise (CW). The "B" clutch is locked which drives the sun gear in the Simpson gear set CW. The sun gear drives the planet pinions CCW. The planetary carrier is held stationary by the "D" clutch. The planet pinions cause the front ring gear to rotate CCW. The front ring gear (and rear carrier) drive the auxiliary gear set CCW which rotates at a ratio of 1:1 due to the "E" clutch locking the sun and ring gear of the auxiliary gear set.

Freewheel "H" and "J" are not used. Freewheel "K" is locked.

Fig 2: Gear Position Chart - Reverse Gear

Courtesy of BMW OF NORTH AMERICA, INC.