CONSTRUCTION
The compound gear unit consists of the power split planetary gear unit and the motor speed reduction planetary gear unit. Each planetary ring gear is integrated with the compound gear. Furthermore, this compound gear is integrated with a counter drive gear and parking gear.
The power split planetary gear unit splits the motive force of the engine two ways: one to drive the wheels, and the other to drive MG1, so that MG1 can function as a generator.
The motor speed reduction planetary gear unit, whose purpose is to reduce MG2 speed, is used to enable the high-speed, high-output MG2 to adapt optimally to the compound gear.
| *1 | Compound Gear Unit | *2 | Power Split Planetary Gear Unit |
| *3 | Counter Drive Gear (Compound Gear) | *4 | Motor Speed Reduction Planetary Gear Unit |
The connection of the sun gear, ring gear and carrier of each planetary gear unit is as shown below.
| Item | Connection | |
|---|---|---|
| Power Split Planetary Gear Unit | Sun Gear | MG1 |
| Ring Gear | Compound Gear (to Wheels) | |
| Carrier | Input Shaft (from Engine) | |
| Motor Speed Reduction Planetary Gear Unit | Sun Gear | MG2 |
| Ring Gear | Compound Gear (to Wheels) | |
| Carrier | Fixed | |
| *1 | MG1 | *2 | MG2 |
| *3 | Power Split Planetary Gear Unit | *4 | Motor Speed Reduction Planetary Gear Unit |
| *5 | Counter Drive Gear | *6 | Sun Gear |
| *7 | Ring Gear | *8 | Carrier |
| *9 | Counter Driven Gear | - | - |