The planetary gear is a mechanism which shifts the drive force from the engine. The planetary gear consists of multiple gears which rotate individually while revolving. By controlling the individual rotation and revolving of the gears, the transaxle performs gear shifting at the optimum gear speed according to the driving conditions.
The planetary gear is positioned in the order of the front planetary gear, rear planetary gear, and reduction planetary gear from the torque converter side. The planetary gear is a single planetary gear type. For the component parts of each planetary gear, refer to the following figure.
Number of teeth and symbols for each gear
The planetary gear is composed of the sun gear, pinion gear, planetary carrier, and internal gear as shown in the figure.
There are two types of pinion gear rotation, rotation (rotation) on an axis of the center for each pinion gear and rotation (revolution) on an axis of center for the planetary carrier. The planetary gear operates shifting function by switching the input, fixed, or output of the internal gear, pinion gear, and planetary carrier.
The relation of rotation speed of each element for the planetary gear set is generally indicated as follows:
(ZR + ZS) NC = ZR NR + ZS NS: (1)
Meaning of symbols
Z: Number of teeth
N: Rotation speed
Additional character R: Internal gear
Additional character S: Sun gear
Additional character C: Planetary carrier (pinion gear)
| Planetary gear unit | Number of teeth | Symbols |
|
| Front | Internal gear | 97 | ZRFr |
| Planetary carrier (part of pinion gear) | 29 | ZCFr |
|
| Sun gear | 38 | ZSFr |
|
| Rear | Internal gear | 95 | ZRRr |
| Planetary carrier (part of pinion gear) | 27 | ZCRr |
|
| Sun gear | 40 | ZSRr |
|
| Reduction | Internal gear | 109 | ZRRed |
| Planetary carrier (part of pinion gear) | 21 | ZCRed |
|
| Sun gear | 68 | ZSRed |
|
Meaning of symbols
1GR
| Planetary gear unit | Front planetary gear |
| Internal gear | 0 (Fix) |
| Planetary carrier (part of pinion gear) | NCFr (Output) |
| Sun gear | NSFr (Input) |
2GR
| Planetary gear unit | Front planetary gear | Rear planetary gear |
| Internal gear | NRFr=NC | 0 (Fix) |
| Planetary carrier (part of pinion gear) | NCFr (Output) | NCRr=Nc |
| Sun gear | NSFr (Input)=NS | NSRr=NS |
3GR
| Planetary gear unit | Front planetary gear | Rear planetary gear | Reduction |
| Internal gear | NRFr=NC1 | NRRr=Nc2 | 0 (Fix) |
| Planetary carrier (part of pinion gear) | NCFr (Output) | NCRr=Nc1 | NCRed=Nc2 |
| Sun gear | NSFr (Input)=NS | NSRr=NS | NSRed=NS |
4GR
| Planetary gear unit | Front planetary gear |
| Internal gear | NRFr (Input) |
| Planetary carrier (part of pinion gear) | NCFr (Output) |
| Sun gear | NSFr (Input) |
5GR
| Planetary gear unit | Front planetary gear | Rear planetary gear | Reduction |
| Internal gear | NRFr=NC1 | NRRr=Nc2 | 0 (Fix) |
| Planetary carrier (part of pinion gear) | NCFr (Output) | NCRr (Input)=Nc1 | NCRed=Nc2 |
| Sun gear | NSFr=NS | NSRr=NS | NSRed=Nc1 |
6GR
| Planetary gear unit | Front planetary gear | Rear planetary gear |
| Internal gear | NRFr=NC | 0 (Fix) |
| Planetary carrier (part of pinion gear) | NCFr (Output) | NCRr (Input)=Nc |
| Sun gear | NSFr=NS | NSRr=NS |
Reverse
| Planetary gear unit | Front planetary gear | Rear planetary gear | Reduction |
| Internal gear | NRFr (Fix) | NRRr=Nc | 0 (Fix) |
| Planetary carrier (part of pinion gear) | NCFr (Output) | NCRr (Fix) | NCRed=Nc |
| Sun gear | NSFr=NS | NSRr=NS | NSRed (Input) |