Automatic Transaxle System: Description

F21 FEATURES 

1. Easy-to-install FF 6-speed automatic transaxle

   The F21 is a compact, lightweight, next-generation electronically controlled FF 6-speed automatic transaxle that employs a ravigneaux-type planetary gear. It employs a high-precision clutch hydraulic control system for smooth, highly responsive gear shift feel.

2. Adoption of centrifugal hydraulic pressure cancel clutch

   When the rotation of the clutch increases, centrifugal force operations on the oil inside the clutch, hydraulic pressure increases, and the timing of clutch engagement becomes earlier. This cause, a difference in rotation between the input shaft and the output shaft, and shift shock may occur. To solve this, an additional chamber has been provided opposite the piston hydraulic pressure chamber. This causes centrifugal hydraulic pressure to operate in the opposite direction with the same force as the piston, counteracting the pressure of the piston hydraulic pressure chamber.

3. Adoption of integrated position sensor with TCU

   The adoption of the integrated oil cooler has the following advantages:

   1. It allows the number of parts to be decreased (the wire harness can be simplified).
   2. Reliability is enhanced because there is no harness circuit between the TCU and shift position sensor.