Apply Components

REVERSE CLUTCH
When hydraulic pressure acts upon the reverse clutch piston, the drive plates and driven plates are pressed tightly together. The driving force transmitted from the input shaft is transmitted to the high clutch drum, reverse clutch hub, reverse clutch drum, connecting shell, and front sun gear sequentially.

When hydraulic pressure not acts upon the reverse clutch piston, the clutch piston is pushed back by the return spring. Therefore, the drive plates and driven plates are detached and no driving force is transmitted.

NOTE: The reverse clutch operates only in R range.

HIGH CLUTCH
When hydraulic pressure acts upon the high clutch piston, the drive plates and driven plates are pressed tightly together. The driving force transmitted from the input shaft is transmitted to the high clutch drum, high clutch hub, and front planetary carrier sequentially.

NOTE: The high clutch operates in third and fourth gear positions.








BAND SERVO PISTON AND BRAKE BAND
The band servo piston assembly contains three chambers to which hydraulic pressure is applied. Hydraulic pressure is applied to each chamber depending on gear positions, which acts upon the piston stem for engagement and disengagement of the brake band.

1st Gear
No hydraulic pressure is applied to the band servo piston assembly. The brake band is disengaged due to the reaction force of the return spring.

2nd Gear
Hydraulic pressure is applied to the 2nd applied chamber. The band servo piston pushes up the piston stem and the brake band is engaged.

Third Gear
Hydraulic pressure is applied to the 2nd applied chamber and 3GR released chamber simultaneously. The band servo piston will push down the piston stem as a result of force applied to the difference between the surface areas of the band servo piston and the reaction force of the return spring, thus disengaging the brake band.

Fourth Gear
When hydraulic pressure is applied simultaneously to the 4GR applied chamber, the 2nd applied chamber, and 3GR released chamber, the 4GR band servo piston will push up the piston stem, engaging the brake band. At this time, however, the band servo piston remains disengaged.

NOTE: The rotational direction of the reverse clutch drum is opposite for 2nd gear and fourth gear. In 2nd gear, the reverse clutch drum will rotate in direction A (opposite from engine rotation). In, Fourth gear the reverse clutch drum will rotate in direction B (same as engine rotation). When seen from the band servo side, direction A is leading direction and direction B is trading direction. Consequently, brake band engagement force needs to be changed between 2nd gear position and fourth gear.





FORWARD CLUTCH
When hydraulic pressure acts upon the forward clutch piston, the drive plates and driven plates are pressed tightly together, and the front planetary carrier and forward one-way clutch outer race are connected by the forward clutch drum.

NOTE: The forward clutch operates in all forward gear positions.





OVERRUNNING CLUTCH
When hydraulic pressure acts upon the overrunning clutch piston, the drive plates and driven plates are pressed tightly together, and the front planetary carrier and rear internal gear are connected by the forward clutch drum and overrunning clutch hub.

NOTE: The overrunning clutch operates as illustrated.

LOW AND REVERSE BRAKE
When hydraulic pressure acts upon the low and reverse brake piston, the drive plates and driven plates are pressed tightly together, and the forward clutch drum is fixed to the transmission case. As a result, the front planetary carrier will be fixed.

NOTE: The low and reverse brake operates in L range 1st gear and R range.





ONE-WAY CLUTCHES
The one-way clutches are sprag-type.

Forward One-Way Clutch

1st Gear
Driven by the inner race rotating counterclockwise, the sprags stand up, causing the one-way clutch to be locked.

As a result, the forward one-way clutch together with the low one-way clutch prevents the rotation of the rear internal gear and front planetary carrier through the forward clutch.

2nd And Third Gears
Driven by the outer race rotating clockwise, the sprags stand up, causing the one-way clutch to be locked.

As a result, the clockwise rotation of the front planetary carrier is transmitted to the rear internal gear through the forward clutch.

Fourth Gear
The one-way clutch transmits the clockwise rotation of the front planetary carrier to the outer race through the forward clutch. The one-way clutch, however will be freed due to a higher speed of internal gear clockwise rotation transmitted to the inner race.

As a result, appropriate downshifting timing from fourth gear to third or 2nd gear will be maintained to reduce shift shock.

Low One-Way Clutch
The inner race is installed on the transmission case. When a counterclockwise driving force is applied to the outer race, the sprags stand up, causing the one-way clutch to be locked.

When a clockwise driving force is applied to the outer race, the one-way clutch will be freed.