HYBRID TRANSMISSION SYSTEM

The compound gear unit is composed of generator (MG1) mainly working as a generator, motor (MG2) mainly working as a power source, the power split device for splitting the engine output and motor output into power to drive generator (MG1) and to drive the wheels, the reduction gear which reduces the speed of motor (MG2) output, the input shaft, the intermediate shaft and the output shaft.

*1	Generator (MG1)	*2	Input Shaft
*3	Power Split Planetary Gear	*4	Intermediate Shaft
*5	Sun Gear (Motor Speed Reduction Planetary Gear)	*6	Ring Gear (Motor Speed Reduction Planetary Gear)
*7	Output Shaft	*8	Planetary Carrier (Motor Speed Reduction Planetary Gear)
*9	Motor Speed Reduction Planetary Gear	*10	Pinion Gear (Motor Speed Reduction Planetary Gear)
*11	Motor (MG2)	*12	Planetary Carrier (Power Split Planetary Gear)
*13	Ring Gear (Power Split Planetary Gear)	*14	Pinion Gear (Power Split Planetary Gear)
*15	Sun Gear (Power Split Planetary Gear)	-	-

By using the power split device, engine output is split into power to drive generator (MG1) and to drive the wheels. The engine output is input through the input shaft and transmitted from the planetary carrier of the power split device through the pinion gear to the sun gear connected to generator (MG1) and the ring gear connected to the intermediate shaft. Also, when the engine is started, generator (MG1) output is transmitted to the engine so that generator (MG1) functions as a starter.

Motor (MG2) output is transmitted from the sun gear of the reduction gear connected to motor (MG2) through the pinion gear to the planetary carrier connected to the output shaft.

Planetary Gear Connection
Planetary Gear Connection		Connected to
Power Split Planetary Gear	Sun Gear	Generator (MG1)
	Planetary Gear Components	Input Shaft
	Ring Gear	Intermediate Shaft
Motor Speed Reduction Planetary Gear	Sun Gear	Motor (MG2)
Motor Speed Reduction Planetary Gear	Planetary Carrier	Output Shaft