Power Flow - 4TH Gear: Notes

Solenoid Operation 

TRANSMISSION SELECTOR LEVER POSITION		SOLENOID
		SLC 1	SLC 2	SLC 3	SLB 1	S1	S2
D	4th Gear	-	-	X	X	-	-

X  = Operating

Clutch and Brake Operation 

TRANSMISSION SELECTOR LEVER POSITION		CLUTCH			BRAKE		ONE-WAY CLUTCH
		C1	C2	C3	B1	B2	F1
D	4th Gear	X	X	-	-	-	-

X  = Operating

The planetary gear trains are in the following conditions:

• Front planetary gear train
  • Input: Ring gear
  • Locked: Sun gear
  • Output: Carrier
• Rear planetary gear train
  • Input: Rear sun gear, Carrier
  • Locked: -
  • Output: Ring gear

Front Planetary Gear Train 

The input shaft rotates in a clockwise direction, driven by the torque converter. The planetary ring gear rotates in a clockwise direction along with the planetary pinion gear which also rotates clockwise on its axis and orbit. The planetary sun gear is locked by the fluid pump which causes it to press against the planetary ring gear and orbit the sun gear, rotating on its axis.

The front planetary carrier rotates clockwise in the same direction as the planetary pinion gear. The clutch (C1) is activated and locks the planetary carrier to the rear planetary sun gear. The intermediate shaft rotates in the same direction as the input shaft. Clutch (C2) is also activated rotates in the same direction as the intermediate shaft.

Rear Planetary Gear Train 

The planetary carrier rotates in a clockwise direction with the intermediate shaft. The short pinion gear rotates clockwise on its axis and orbits at a faster speed than the sun gear. The long pinion gear rotates counter-clockwise on its axis and orbit. The rotation of the ring gear is in a clockwise direction and is slower than the rotation of the carrier due to the long pinion gear's rotation is counteracted by the planetary carrier.

The counter drive gear rotates in a clockwise direction with the ring gear.

The counter driven gear is rotated in a counter-clockwise direction which in turn drives the differential ring gear in a clockwise direction.