Fourth Gear (D Range O/D Off)
Fourth Gear (D range O/D OFF)Outline
^ The driving force of the input shaft is transmitted to the front planetary carrier via the high clutch, causing it to rotate counterclockwise.
As a result, the front pinion gear rotates counterclockwise. This rotation causes the front internal gear to rotate at an increased speed and the rear planetary carrier to rotate counterclockwise. The driving force of the rear planetary carrier, whose speed has also been increased, is transmitted to the output gear.
^ 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 brake. 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, engine braking is transmitted in the opposite direction.
Operation
^ With shift solenoids A and B OFF, spring force is applied to every upper end of shift valve A, and shift valve B is positioned on the lower side.
^ With shift solenoid C ON, pilot pressure is applied to bottom end of shift solenoid C, and shift valve C is positioned on the upper side.
^ Line pressure is applied to the 2-4 brake accumulator, and engages the 2-4 brake through shift valve B, and shift valve A.
^ Line pressure is applied to the high clutch accumulator, and engages the high clutch through shift valve B, 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.
