Power Flow
Power Flow
N Position
Hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft.
P Position
Hydraulic pressure is not applied to the clutches. Power is not transmitted to the countershaft. The countershaft is locked by the park pawl interlocking the park gear.
1 Position
In 1 position, hydraulic pressure is applied to the 1st clutch and the 1st-hold clutch.
The power flow when accelerating is as follows:
1. The hydraulic pressure is applied to the 1st clutch on the mainshaft, and power is transmitted via the 1st clutch to the mainshaft 1st gear.
2. The hydraulic pressure is also applied to the 1st-hold clutch on the countershaft. Power transmitted to the mainshaft 1st gear is conveyed via the countershaft 1st gear to the 1st gear one-way clutch, the 2nd gear one-way clutch, and the 1st-hold clutch. The one-way clutches are used to drive the countershaft, and the 1st-hold clutch drives the countershaft.
3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.
1 Position
The power flow when decelerating is as follows:
1. Rolling resistance from the road surface goes through the front wheels to the secondary drive gear, then to the countershaft 1st gear via the 1st-hold clutch which is applied during deceleration.
2. The 1st gear one-way clutch disengages at this time because the application of torque is reversed.
3. The counterforce conveyed to the countershaft 1st gear turns the mainshaft 1st gear. At this time, since hydraulic pressure is also applied to the 1st clutch, counterforce is also transmitted to the mainshaft. As a result, engine braking can be obtained with 1st gear.
2 Position
2 Position is provided to drive only in 2nd gear.
In 2 position, hydraulic pressure is applied to the 2nd clutch and to the 1st-hold clutch.
The power flow when accelerating is as follows:
1. The hydraulic pressure is applied to the 2nd clutch on the mainshaft, and power is transmitted via the 2nd clutch to the mainshaft 2nd gear.
2. Power transmitted to the mainshaft 2nd gear is conveyed via the countershaft 2nd gear to the 2nd gear one-way clutch on the inside of the countershaft 2nd gear. The 2nd gear one-way clutch is used to drive the park gear on the countershaft.
3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear. Hydraulic pressure is applied to the 1st-hold clutch, but the countershaft is rotated by the 2nd gear one-way clutch.
2 Position
The power flow when decelerating is as follows:
1. Rolling resistance from the road surface goes through the front wheels to the secondary drive gear, then to the countershaft 1st gear via the 1st-hold clutch which is applied during deceleration.
2. Power transmitted to the countershaft 1st gear is conveyed via the 1st gear one-way clutch on the inside of the countershaft 1st gear to the countershaft 2nd gear. The 1st gear one-way clutch is used to drive the countershaft 2nd gear.
3. The 2nd gear one-way clutch disengages at this time because the application of torque is reversed.
4. The counterforce conveyed to the countershaft 1st gear turns the mainshaft 2nd gear. At this time, since hydraulic pressure is applied to the 2nd clutch, counterforce is transmitted to the mainshaft. As a result, engine braking can be obtained with 2nd gear.
In D4 or D3 position, the optimum gear is automatically selected from 1st, 2nd, 3rd, and 4th gears, according to conditions such as the balance between throttle opening (engine load) and vehicle speed.
D4 or D2 Position, 1st gear
1. The hydraulic pressure is applied to the 1st clutch, which rotates together with the mainshaft, causing the mainshaft 1st gear to rotate.
2. Power is transmitted to the countershaft 1st gear, which drives the countershaft via the one-way clutches.
3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.
NOTE: In N or D4 position, hydraulic pressure is not applied to the 1st-hold clutch.
D4 or D3 Position, 2nd gear
1. The hydraulic pressure is applied to the 2nd clutch, which rotates together with the mainshaft, causing the mainshaft 2nd gear to rotate.
2. Power is transmitted to the countershaft 2nd gear, which drives the countershaft via the 2nd gear one-way clutch.
3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.
NOTE: In D4 or D3 position, 2nd gear, hydraulic pressure is also applied to the 1st clutch, but since the rotation speed of 2nd gear exceeds that of 1st gear, power from 1st gear is cut off at the 1st gear one-way clutch.
D4 or D3 Position, 3rd gear
1. The hydraulic pressure is applied to the 3rd clutch. Power from mainshaft 3rd gear is transmitted to the countershaft 3rd gear.
2. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.
NOTE: In D4 or D3 position, 3rd gear, hydraulic pressure is also applied to the 1st clutch and to the 2nd clutch, but since the rotation speed of 3rd gear exceeds that of 2nd gear, power from 2nd gear is cut off at the 2nd gear one-way clutch.
D4 Position, 4th gear
1. The hydraulic pressure is applied to the 4th clutch, which rotates together with the mainshaft, causing the mainshaft 4th gear to rotate.
2. Power is transmitted to the countershaft 4th gear, which drives the countershaft.
3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.
NOTE: In N position, 4th gear, hydraulic pressure is also applied to the 1st clutch and to the 2nd clutch, but since the rotation speed of 4th gear exceeds that of 2nd gear, power from 2nd gear is cut off at the 2nd gear one-way clutch.
R Position
1. The hydraulic pressure is applied to the reverse clutch. Power is transmitted from the mainshaft reverse gear via the reverse idler gear to the countershaft reverse gear.
2. The rotation direction of the countershaft reverse gear is changed via the reverse idler gear in the rear cover.
3. Power is transmitted to the secondary drive gear, which drives the secondary driven gear.