Third Gear (D Range)

Third Gear (D Range)

Outline
^ The driving force of the input shaft is transmitted to the high clutch, causing the front planetary carrier to rotate counterclockwise.
This driving force is also transmitted to the rear internal gear through the low clutch making it rotate counterclockwise.
The rear sun gear and rear internal gear rotate at the same speed, and so the rear pinion gear, which rotates with them as a unit instead of on its own axis, transmits the driving force to the driving wheels.
^ Though the reduction internal gear rotates clockwise, trying to revolve the reduction pinion gear clockwise, the reduction pinion gear tries to rotate clockwise as the load from the vehicle (force that prevents the reduction carrier from rotating clockwise) is applied to the reduction carrier.
^ The force of the reduction pinion gear, which tries to rotate clockwise, tries to rotate the reduction sun gear counterclockwise. However, counterclockwise rotation of the reduction sun gear is locked by the reduction one-way clutch. Due to this, driving force of the reduction pinion gear overcomes the load from the vehicle to revolve clockwise while rotating clockwise, and rotates the reduction carrier clockwise.
^ Therefore, the reduction gear also rotates clockwise and the driving force is transmitted to the driving wheels.
^ During deceleration, torque is transmitted from the driving wheels, in the opposite direction of that during acceleration. First, force is transmitted from the driving wheels via the final gear and the reduction gear to rotate the reduction carrier clockwise. Moreover, the force tries to revolve the reduction pinion gear clockwise.
^ The force to rotate the reduction pinion gear clockwise tries to rotate the reduction internal gear clockwise. However, as the load from the engine (force that tries to prevent the reduction internal gear from rotating clockwise) is applied to the reduction internal gear, the reduction pinion gear rotates counterclockwise.
^ Due to the counterclockwise rotation of the reduction pinion gear, the reduction sun gear tries to rotate clockwise. However, at this time, the reduction one-way clutch that is locked during vehicle acceleration becomes free and starts to rotate freely.
^ Due to this, the reduction pinion gear force that tries to rotate the reduction internal gear clockwise is absorbed by the free rotation of the reduction sun gear. Therefore torque is not transmitted to the reduction internal gear and the engine braking is not applied.





Operation
^ With shift solenoids A and C OFF, spring force is applied to upper end of shift valve A, and shift valve C is position on the lower side.
^ With shift solenoid B ON, pilot pressure is applied to the bottom end of shift valve B, and the shift valve B is positioned on the upper side.
^ Line pressure is applied to the low clutch accumulator, and the engages the low clutch through the shift valve B.
^ Line pressure is applied to the high clutch accumulator, and engages the high clutch through shift valve C and shift valve A.
^ Line pressure delivered to the pressure regulator valve is sent to the torque converter through the TCC control valve as torque converter pressure.