AUTOMATIC TRANSMISSION SYSTEM

CONSTRUCTION

An 8-speed configuration has been achieved by using 2 planetary gear units, creating an 8-speed automatic transmission.
A Ravigneaux type gear unit is used as the rear planetary gear unit. The gear unit consists of pairs of sun gears (middle and rear) and planetary pinion gears (long and short) with different diameters within a single planetary gear.

The centrifugal fluid pressure canceling mechanism is used in the C1, C2, C3 and C4 clutches that are applied when shifting from 2nd to 3rd, from 3rd to 4th, from 4th to 5th, from 5th to 6th, from 6th to 7th and from 7th to 8th.

*1	No. 1 Brake (B1)	*2	No. 4 Clutch (C4)
*3	Front Planetary Ring Gear	*4	Rear Planetary Gear Unit
*5	No. 2 Clutch (C2)	*6	No. 2 Brake (B2)
*7	No. 1 1-way Clutch	*8	No. 1 Clutch (C1)
*9	No. 3 Clutch (C3)	-	-

*1	Input Shaft	*2	Front Planetary Sun Gear
*3	Front Planetary Ring Gear	*4	Front Planetary Gear Unit
*5	Intermediate Shaft	*6	Rear Planetary Middle Sun Gear
*7	Rear Planetary Ring Gear	*8	Rear Planetary Gear Unit
*9	Rear Planetary Rear Sun Gear	*10	Output Shaft
*11	Rear Planetary Short Pinion Gear	*12	Rear Planetary Long Pinion Gear
*13	Front Planetary Pinion Gear	-	-
C1	No. 1 Clutch	C2	No. 2 Clutch
C3	No. 3 Clutch	C4	No. 4 Clutch
B1	No. 1 Brake	B2	No. 2 Brake
F1	No. 1 1-way Clutch	-	-

OPERATION

Transmission Power Flow

Figure 1. 1st Gear (S1, D1, M1)

	Output		Input
	Operates	-	-

Figure 2. 1st Gear (D, S2 to S8, D2 to D8)

	Output		Input
	Operates	-	-

Figure 3. 2nd Gear

	Output		Input
	Operates	-	-

Figure 4. 3rd Gear

	Output		Input
	Operates	-	-

Figure 5. 4th Gear

	Output		Input
	Operates	-	-

Figure 6. 5th Gear

	Output		Input
	Operates	-	-

Figure 7. 6th Gear

	Output		Input
	Operates	-	-

Figure 8. 7th Gear

	Output		Input
	Operates	-	-

Figure 9. 8th Gear

	Output		Input
	Operates	-	-

Figure 10. Reverse Gear

	Output		Input
	Operates	-	-