Selector Lever in Drive Position

Under these conditions, the epicyclic set of gears, the planetary gears (3), the sun gear and the outer ring gear are held by the forward clutch (4) that is engaged.

• The transmission input shaft (1) turns at the same speed as the engine.
• The reverse clutch (2) is disengaged.
• The forward clutch (4) is engaged.
• The planetary gears (3) the sun gear and the annular ring gear of the epicyclic train will rotate together.
• The primary pulley (5) turns at the same speed as the engine in the forward gear direction.
• The secondary pulley (7) turns in the forward gear direction at a speed that depends upon the belt ratio for that operating condition.

Fig 1: Selector Lever In Drive Position

Courtesy of BMW OF NORTH AMERICA, INC.