Power Flow

POWER FLOW





1. "D" OR "2" RANGE FIRST GEAR
The driving force of the Overdrive (O/D hereinafter) input shaft is transmitted to the O/D planetary carrier. The O/D planetary carrier, O/D sun gear and O/D ring gear are connected together by the O/D clutch and O/D one-way clutch and they turn clockwise as one unit.
As the Forward Clutch(F/C hereinafter) input shaft is incorporated with the O/D planetary ring gear, revolution of the O/D input shaft is transmitted directly to the F/C input shaft. Then it is further transmitted through the forward clutch to the intermediate shaft and the rear planetary ring gear which is incorporated with the intermediate shaft. Thus, the rear pinion revolves while turning on its axis both clockwise and the output shaft connected to the rear planetary carrier revolves clockwise.
On the other hand, the sun gears engaged with the rear planetary pinion receives counterclockwise revolution and causes the front planetary pinion to turn clockwise. In this state, the front planetary carrier is under the counterclockwise revolution force but as the carrier is prevented from turning due to the operation of the one-way clutch No.2, clockwise revolution is transmitted to the output shaft. When reducing the speed, the one-way clutch No.2 spins and the front planetary carrier turns clockwise because the front planetary ring gear revolution is higher than the front planetary pinion revolution (on its axis). Thus, the reverse torque from the driving wheel is not transmitted to the engine and therefore the engine brake does not work.

OPERATING CLUTCHES AND SOLENOID VALVES
Overdrive clutch
Overdrive one-way clutch
Forward clutch
One-way clutch No.2
Shift solenoid valve A (#1) ON
Shift solenoid valve B (#2) OFF





2. "D" RANGE SECOND GEAR
The driving force of the O/D input shaft is transmitted to the O/D planetary carrier. The O/D planetary carrier, O/D sun gear and O/D ring gear are connected together by the O/D clutch and O/D one-way clutch and they turn clockwise as one unit.
As the F/C input shaft is integrated with the O/D planetary ring gear, revolution of the O/D input shaft is transmitted directly to the F/C input shaft. Then it is further transmitted through the forward clutch to the intermediate shaft and the rear planetary ring gear which is incorporated with the intermediate shaft.
As the sun gears are fixed by the second brake, the rear planetary carrier and the rated with it turn clockwise at a higher speed than in the first gear.
When reducing the speed, the one-way clutch No.2 spins and the front planetary carrier turns clock wise as in the first gear. Thus, the reverse torque from the driving wheel is not transmitted to the engine and therefore the engine brake does not work.

OPERATING CLUTCHES/BRAKE AND SOLENOID VALVES
Overdrive clutch
Overdrive one-way clutch
Forward clutch
Second brake
Shift solenoid valve -A (#1) ON
Shift solenoid valve -B (#2) ON





3. "D" RANGE THIRD GEAR
The driving force of the O/D input shaft is transmitted to the O/D planetary carrier. The O/D planetary carrier, O/D sun gear and O/D planetary ring gear are connected together by the O/D clutch and O/D one-way clutch and they turn clockwise as one unit.
As the F/C input shaft is integrated with the O/D planetary ring gear, revolution of the O/D input shaft is transmitted directly to the F/C input shaft. At this point, the forward clutch operates to transmit the revolution to the intermediate shaft and rear planetary ring gear which is incorporated with it and the direct clutch operates to transmit the same revolution to the sun gears. As a result, the rear planetary carrier is connected with the rear planetary ring gear and sun gear and turn clockwise as one unit and so does the output shaft. In this state, the revolution of the output shaft is the same as that of the O/D input shaft.
When reducing the speed, the rear planetary carrier tries to turn at a higher speed than the rear planetary ring gear, but as the rear planetary gear is connected directly with the engine and the rear planetary carrier and rear planetary ring gear are connected directly, a force to prevent such speed increase occurs and the engine brake works.

OPERATING CLUTCHES/BRAKE AND SOLENOID VALVES
Overdrive clutch
Overdrive one-way clutch
Forward clutch
Direct clutch
Second brake
Shift solenoid valve -A (#1) OFF
Shift solenoid valve -B (#2) ON





4. "D" RANGE FOURTH GEAR (OVERDRIVE)
The driving force of the O/D input shaft is transmitted to the O/D Planetary carrier. Here the O/D brake operates to fix the O/D sun gear and the O/D pinion revolves and rotates on its axis both clockwise to transmit revolution to the O/D planetary ring gear. In the state, the O/D planetary ring gear turns et a higher speed than in 1st, 2nd or 3rd gear by the amount increased because the O/D pinion rotates on its axis.
As the F/C input shaft is integrated with the O/D planetary ring gear, revolution of the O/D input shaft is transmitted directly to the F/C input shaft. At this point, the forward clutch operates to transmit the revolution to the intermediate shaft and rear planetary ring gear which is incorporated with it and the direct clutch operates to transmit the same revolution to the sun gears. As a result, the rear planetary carrier is connected to the rear planetary ring gear and sun gears and turn clockwise and so does the output shaft. In this state, the output shaft turns at a higher speed than in the 3rd gear by the amount increased at the O/D planetary carrier.
When reducing the speed, the rear planetary carrier tries to turn at a higher speed than the rear planetary ring gear, but as the rear planetary gear is connected directly with the engine and the rear planetary carrier and rear planetary ring gear are connected directly, a force to prevent such speed increase occurs and the engine brake works.

OPERATING CLUTCHES/BRAKE AND SOLENOID VALVES
Overdrive brake
Forward clutch
Direct clutch
Second brake
Shift solenoid valve -A (#1) OFF
Shift solenoid valve -B (#2) OFF





5. "2" RANGE SECOND GEAR
The driving force of the O/D input shaft is transmitted to the output shaft through the same passage as in the "D" range second gear and when reducing the speed, the second coast brake operates to activate the engine brake.
When reducing the speed, the rear planetary carrier tries to turn at a higher speed than that transmitted from the planetary ring gear and tries to turn the sun gears clockwise. However, as the second coast brake operates to fix the sun gears, increase in revolution of the rear planetary carrier is all transmitted to the planetary ring gear. In this state, the rear planetary ring gear is directly connected with the engine and actuates the engine brake.

OPERATING CLUTCHES/BRAKE AND SOLENOID VALVES
Overdrive clutch
Overdrive one-way clutch
Forward clutch
Second coast brake
Second brake
Shift solenoid valve -A (#1) ON
Shift solenoid valve -B (#2) ON





6. "L" RANGE
The driving force of the O/D input shaft is transmitted to the output shaft through the same passage as in the "D" range first gear and when reducing the speed, the reverse brake operates to activate the engine brake.
When reducing the speed, the planetary ring gear tries to turn at a higher speed than that transmitted from the front pinion and tries to turn the front planetary carrier clockwise. However, as the reverse brake operates to fix the front planetary carrier, increase in revolution of the front planetary ring gear is all transmitted through the front pinion to the sun gears. Increase in speed of the sun gears is transmitted to the rear planetary ring gear through the rear pinion and as a result, the engine brake comes into operation.

OPERATING CLUTCHES/BRAKE AND SOLENOID VALVES
Overdrive clutch
Overdrive one-way clutch
Forward clutch
Reverse brake
Shift solenoid valve -A (#1) ON
Shift solenoid valve -B (#2) OFF





7. "R" RANGE
The driving force of the O/D input shaft is transmitted to the O/D planetary carrier. The O/D planetary carrier, O/D sun gear and O/D ring gear are connected together by the O/D clutch and O/D one-way clutch and they turn clockwise as one unit.
As the F/C input shaft is integrated with the O/D planetary ring gear, clockwise revolution of the O/D input shaft is transmitted directly to the F/C input shaft. Then the direct clutch operates to transmit revolution of the O/D planetary ring gear to the sun gears and the front pinion. Here, the front pinion urns counterclockwise on its axis without revolving because of the reverse brake and causes the output shaft to turn counterclockwise.

OPERATING CLUTCHES/BRAKE AND SOLENOID VALVES
Overdrive clutch
Overdrive one-way clutch
Direct clutch
Reverse brake
Shift solenoid valve -A (#1) ON
Shift solenoid valve -B (#2) OFF





8. "N" OR "P" RANGE
The driving force of the O/D input shaft is transmitted to the O/D planetary carrier. The O/D carrier, O/D sun gear and O/D planetary ring gear are connected together by the O/D clutch and O/D one-way clutch and they turn clockwise as one unit.
As the F/C input shaft is integrated with the O/D ring gear, revolution of the O/D input shaft is transmitted directly to the F/C input shaft. At this point, as neither forward clutch nor direct clutch is at work, the power is not transmitted rearward.
In the "P" range, the parking rod pawl fits in the groove in the front planetary gear mechanically to prevent the output shaft from turning.

OPERATING CLUTCHES AND SOLENOID VALVES
Overdrive clutch
Overdrive one-way clutch
Shift solenoid valve-A (#1) ON
Shift solenoid valve-B (#2) OFF