1st GEAR OF D RANGE OR MANUAL MODE (BELOW SET SPEED) (D1)

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When the 1st gear is selected in the D range or in manual mode (below set speed), only the low clutch is engaged. In this state, the rear internal gear attempts to rotate counterclockwise but it is impossible by the action of the one-way clutch which locks the internal gear to the transmission case. As a result, rotation of the rear sun gear causes the pinion gears to rotate around the sun gear. This causes the planetary carrier to rotate. In this way, rotation of the input shaft is transmitted to the reduction drive shaft, after being subjected to speed reduction by the planetary gear train.

On the other hand, the rear internal gear rotates clockwise if the reverse driving force is applied to it by the reduction drive shaft during coasting. This clockwise rotation of the internal gear causes the one-way clutch to freewheel. Since the power path between the reduction drive shaft and the input shaft is lost as a result, no engine braking effect is available.

Operating condition of components

Low clutch: engaged
One-way clutch: locked

Power flow (in acceleration)

Fig 1: Identifying Gear Train Components (1st Gear Of D Range Or Manual Mode)

Courtesy of SUBARU OF AMERICA, INC.