1. 1st gear
(1) The input shaft turns the front planetaryring gear clockwise by C1.
(2) The front planetary pinion gear turns and revolves and makes the sun gear turn counterclockwise.
(3) In the rear planetary gear, the rear planetary carrier is fixed by F2, so the sun gear makes the rear planetary ring gear turn clockwise via the rear planetary pinion gear.
(4) The front planetary carrier and the rear planetary ring gear make the output shaft turn clockwise. In this way, large speed reduction ratios are produced. Also, in the” L” range, B3 operates and the engine brake is applied. The length of the arrow shows the rotational speed and the width of the arrow shows the torque.
The longer the arrow, the greater the rotational speed and the wider the arrow, the greater the torque.
2. 2nd gear
(1) The input shaft turns the front planetary ring gear clockwise by C1.
(2) Since the sun gear is fixed by B2 and F1, power is not transmitted to the rear planetary gear.
(3) The front planetary carrier makes the output shaft turn clockwise.
The speed reduction ratio is less than for 1st gear. Also, in the “2” range, B1 operates and the engine brake is applied. The length of the arrow shows the rotational speed and the width of the arrow shows the torque. The longer the arrow, the greater the rotational speed and the wider the arrow, the greater the torque.
3. 3rd gear
(1) The input shaft turns the front planetary ring gear clockwise by C1 and at the same time turns the sun gear clockwise by C2.
(2) As the front planetary ring gear and the sun gear rotate together at the same speed, the over-all planetary gear unit also rotates at the same speed and power is output from the front planetary carrier to the output shaft.
In 3rd gear, the speed reduction ratio is 1. Even in 3rd gear in the “D” range, the engine brake is applied, but since the speed reduction ratio is 1, the engine braking is relatively minimal. The length of the arrow shows the rotational speed and the width of the arrow shows the torque. The longer the arrow, the greater the rotational speed and the wider the arrow, the greater the torque.
4. Reverse gear
(1) The input shaft turns the sun gear clockwise by C2
(2) At the rear planetary gear, since the rear planetary carrier is fixed by B3, the rear planetary ring gear turns counterclockwise via the rear planetary pinion gear and the output shaft is turned counterclockwise.
In this way, the output shaft is turned in reverse and the vehicle backs up with a large speed reduction ratio. Engine braking occurs when the transaxle has been shifted into reverse, since the reverse gear does not use a one-way clutch to transmit driving force. The length of the arrow shows the rotational speed and the width of the arrow shows the torque. The longer the arrow, the greater the rotational speed and the wider the arrow, the greater the torque.
“P” or “N” Range
When the shift lever is in “N” or “P”, the forward clutch (C1) and direct clutch (C2) do not operate, so input from the input shaft is not transmitted to the differential drive pinion shaft. In addition, when the shift lever is in “P”, the parking lock pawl engages with the parking gear to which the differential drive pinion shaft is splined, thus preventing the vehicle from moving.
NOTICE:
Parking lock mechanism for FR vehicles
When the shift lever of an automatic transmission for a FR vehicle is in the “P” range, the parking lock pawl is engaged with the front or rear planetary ring gear, which is splined with the output shaft, preventing movement of the vehicle. However, on FR- based 4WD vehicles, the movement of the vehicle cannot be prevented if the transfer mechanism is in neutral, even if the automatic transmission is in “P”. For this reason, be sure to set the parking brake when parking.