| 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. | |
List Of Operating Components
Clutch/Brake
|
Operation
|
C1
|
C1 Clutch
|
Connects front planetary carrier to rear planetary rear
sun gear
|
C2
|
C2 Clutch
|
Connects intermediate shaft to rear planetary
carrier
|
C3
|
C3 Clutch
|
Connects front planetary carrier to rear planetary
middle sun gear
|
B1
|
B1 Brake
|
Locks rear planetary middle sun gear
|
B2
|
B2 Brake
|
Locks rear planetary carrier
|
F1
|
One-way Clutch
|
Locks counterclockwise rotation of rear planetary
carrier
|
Procedure
Of Operating Each Gear
| 1. |
"D" -1st gear
● Power transmission pathway [Operating
components: C1, F1]
Operating components:
C1, F1 (counterclockwise rotation is
locked), B2 (ON when engine brake is operating)
Planetary gear unit
|
Input, Locked, Output
|
Front
|
Input: Ring gear, Locked: Sun gear, Output:
Carrier
|
Rear
|
Input: Rear sun gear, Locked: Carrier, Output:
Ring gear
|
| (1) |
Input shaft (rotates clockwise) [same
revolutions as the torque converter's turbine
runner] |
| (2) |
Front planetary ring gear (rotates
clockwise) [same revolutions as the input
shaft] |
| (3) |
Front planetary pinion gear (rotates
clockwise on its axis, orbits clockwise)
[because the front planetary sun gear
is locked by the oil pump, it is pressed against the front
planetary ring gear and orbits the sun gear while rotating on
its axis (because the front planetary ring gear has internal
gears, the rotational direction does not
change)] |
| (4) |
Front planetary carrier (rotates
clockwise)
[reduction: same revolution as the
front planetary pinion gear orbit
revolution] |
| (5) |
C1-CLUTCH (rotates clockwise)
[connects the front planetary carrier and the rear planetary
sun gear] |
| (6) |
Rear planetary sun gear (rotates
clockwise) [same revolution as the front planetary
carrier] |
| (7) |
Rear planetary short pinion gear
(rotates counterclockwise on its axis)
[the rear planetary carrier tries to
rotate counterclockwise, but the counterclockwise rotation is
locked by one-way clutch F1.] |
| (8) |
Rear planetary long pinion gear
(rotates clockwise on its axis)
[the rear planetary middle sun gear
rotates counterclockwise
(idling)] |
| (9) |
Rear planetary ring gear (rotates
clockwise) [the rear planetary ring gear is rotated by the
rear planetary long pinion gear (because the rear planetary
ring gear has internal gears, the rotational direction does
not change)] |
| (10) |
Counter drive gear (rotates clockwise)
[because the rear planetary ring gear is installed on the
counter drive gear, the rotational direction and the
revolution are the same as the rear planetary ring
gear] |
| (11) |
Counter driven gear (rotates
counterclockwise) |
| (12) |
Differential ring gear (rotates
clockwise)
|
● Engine brake
When the engine brake is operating, driving
force is transmitted from the
tires. |
| 2. |
"D" -2nd gear
● Power transmission pathway [Operating
components: C1, B1]
Planetary gear unit
|
Input, Locked, Output
|
Front
|
Input: Ring gear, Locked: Sun gear, Output:
Carrier
|
Rear
|
Input: Rear Sun gear, Locked: Middle Sun gear,
Output: Ring gear
|
| (1) |
Input shaft (rotates clockwise) [same
revolutions as the torque converter's turbine
runner] |
| (2) |
Front planetary ring gear (rotates
clockwise) [same revolution as the input
shaft] |
| (3) |
Front planetary pinion gear (rotates
clockwise on its axis, orbits clockwise)
[because the front planetary sun gear
is locked by the oil pump, it is pressed against the front
planetary ring gear and orbits the sun gear while rotating on
its axis (because the front planetary ring gear has internal
gears, the rotational direction does not
change)] |
| (4) |
Front planetary carrier (rotates
clockwise)
[reduction: same revolution as the
front planetary pinion gear orbit
revolution] |
| (5) |
C1-CLUTCH (rotates clockwise)
[connects the front planetary carrier and the rear planetary
sun gear] |
| (6) |
Rear planetary sun gear (rotates
clockwise) [same revolution as the front planetary
carrier] |
| (7) |
Rear planetary middle sun gear is
locked by B1-BRAKE |
| (8) |
Rear planetary short pinion gear
(rotates counterclockwise on its axis, orbits
clockwise) |
| (9) |
Rear planetary long pinion gear
(rotates clockwise on its axis, orbits
clockwise) |
| (10) |
Rear planetary ring gear (rotates
clockwise)
[the rear planetary ring gear is
rotated by the rear planetary long pinion gear (because the
rear planetary ring gear has internal gears, the rotational
direction does not change)] |
| (11) |
Counter drive gear (rotates
clockwise)
[because the rear planetary ring gear
is installed on the counter drive gear, the rotational
direction and the revolution are the same as the rear
planetary ring gear] |
| (12) |
Counter driven gear (rotates
counterclockwise) |
| (13) |
Differential ring gear (rotates
clockwise) | |
| 3. |
"D"-3rd gear
● Power transmission pathway [Operating
components: C1, C3]
Planetary gear unit
|
Input, Locked, Output
|
Front
|
Input: Ring gear, Locked: Sun gear, Output:
Carrier
|
Rear
|
Input: Rear Sun gear, Middle Sun gear, Locked: -
, Output: Ring gear
|
| (1) |
Input shaft (rotates clockwise) [same
revolution as the torque converter's turbine
runner] |
| (2) |
Front planetary ring gear (rotates
clockwise) [same revolution as the input
shaft] |
| (3) |
Front planetary pinion gear (rotates
clockwise on its axis, orbits clockwise)
[because the front planetary sun gear
is locked by the oil pump, it is pressed against the front
planetary ring gear and orbits the sun gear while rotating on
its axis (because the front planetary ring gear has internal
gears, the rotational direction does not
change)] |
| (4) |
Front planetary carrier (rotates
clockwise)
[reduction: same revolution as the
front planetary pinion gear orbit
revolution] |
| (5) |
C1-CLUTCH (rotates clockwise)
[connects the front planetary carrier and the rear planetary
sun gear] |
| (6) |
C3-CLUTCH (rotates clockwise)
[connects the front planetary carrier and the rear planetary
middle sun gear] |
| (7) |
Rear planetary gear assembly (rotates
clockwise)
[because the rear planetary short
pinion gear and the rear planetary long pinion gear are
engaged, both the pinion gears are locked due to the
difference in the rotational directions, and kinematic energy
of the rear planetary sun gear and rear planetary middle sun
gear is transmitted to the rear planetary ring
gear] |
| (8) |
Rear planetary ring gear (rotates
clockwise) [same revolution as the rear planetary
carrier] |
| (9) |
Counter drive gear (rotates
clockwise)
[because the rear planetary ring gear
is installed on the counter drive gear, the rotational
direction and the revolution are same as the rear planetary
ring gear] |
| (10) |
Counter driven gear (rotates
counterclockwise) |
| (11) |
Differential ring gear (rotates
clockwise) | |
| 4. |
"D"-4th gear
● Power transmission pathway [Operating
components: C1, C2]
Planetary gear unit
|
Input, Locked, Output
|
Front
|
Input: Ring gear, Locked: Sun gear, Output:
Carrier
|
Rear
|
Input: Rear Sun gear, Carrier, Locked: - ,
Output: Ring gear
|
| (1) |
Input shaft (rotates clockwise) [same
revolution as the torque converter's turbine
runner] |
| (2) |
Front planetary ring gear(rotates
clockwise) [same revolution as the input
shaft] |
| (3) |
Front planetary pinion gear (rotates
clockwise on its axis, orbits clockwise)
[because the front planetary sun gear
is locked by the oil pump, it is pressed against the front
planetary ring gear and orbits the sun gear while rotating on
its axis (because the front planetary ring gear has internal
gears, the rotational direction does not
change)] |
| (4) |
Front planetary carrier (rotates
clockwise)
[reduction: same revolution as the
front planetary pinion gear orbit
revolution] |
| (5) |
C1-CLUTCH (rotates clockwise)
[connects the front planetary carrier and the rear planetary
sun gear] |
| (6) |
Intermediate shaft (rotates clockwise)
[same revolution as the input
shaft]] |
| (7) |
C2-CLUTCH (rotates clockwise) [same
revolution as the intermediate
shaft] |
| (8) |
Rear planetary carrier (rotates
clockwise) [same revolution as the intermediate
shaft] |
| (9) |
Rear planetary short pinion gear
(rotates clockwise on its axis, orbits clockwise) [because the
rear planetary carrier rotates faster than the rear planetary
sun gear] |
| (10) |
Rear planetary long pinion gear
(rotates counterclockwise on its axis, orbits
clockwise) |
| (11) |
Rear planetary ring gear (rotates
clockwise)
[because the rear planetary long
pinion gear's rotation is subtracted from the rear planetary
carrier revolution, the rear planetary ring gear revolution is
slower than those of the rear planetary
carrier] |
| (12) |
Counter drive gear (rotates
clockwise)
[because the rear planetary ring gear
is installed on the counter drive gear, the rotational
direction and the revolution is the same as the rear planetary
ring gear] |
| (13) |
Counter driven gear (rotates
counterclockwise) |
| (14) |
Differential ring gear (rotates
clockwise) | |
| 5. |
"D"-5th gear
● Power transmission pathway [Operating
components: C2, C3]
Planetary gear unit
|
Input, Locked, Output
|
Front
|
Input: Ring gear, Locked: Sun gear, Output:
Carrier
|
Rear
|
Input: Carrier, Middle Sun gear, Locked: - ,
Output: Ring gear
|
| (1) |
Input shaft (rotates clockwise) [same
revolutions as torque converter's turbine
runner] |
| (2) |
Front planetary ring gear (rotates
clockwise) [same revolution as the input
shaft] |
| (3) |
Front planetary pinion gear (rotates
clockwise on its axis, orbits clockwise)
[because the front planetary sun gear
is locked by the oil pump, it is pressed against the front
planetary ring gear and orbits the sun gear while rotating on
its axis (because the front planetary ring gear has internal
gears, the rotational direction does not
change)] |
| (4) |
Front planetary carrier (rotates
clockwise)
[reduction: same revolution as the
front planetary pinion gear orbit
revolution] |
| (5) |
C3-CLUTCH (rotates clockwise)
[connects the front planetary carrier and the rear planetary
middle sun gear] |
| (6) |
Rear planetary middle sun gear
(rotates clockwise)
[same revolution as C3-CLUTCH
(decelerates by the front planetary gear, so the revolutions
are slower than the input
shaft)] |
| (7) |
Intermediate shaft (rotates clockwise)
[same revolution as the input
shaft] |
| (8) |
C2-CLUTCH (rotates clockwise) [same
revolution as the intermediate
shaft] |
| (9) |
Rear planetary carrier (rotates
clockwise) [same revolutions as intermediate
shaft] |
| (10) |
Rear planetary long pinion gear
(rotates clockwise on its axis, orbits clockwise)
[because the rear planetary carrier
rotates faster than the rear planetary middle sun gear, the
rear planetary middle pinion gear is pushed out by the speed
difference, and orbits clockwise while rotating clockwise on
its axis.] |
| (11) |
Rear planetary ring gear (rotates
clockwise)
[because the rear planetary long
pinion gear's rotation is added to the rear planetary carrier
revolutions, rear planetary ring gear revolution is faster
than those of the rear planetary
carrier] |
| (12) |
Counter drive gear (rotates
clockwise)
[because the rear planetary ring gear
is installed on the counter drive gear, the rotational
direction and revolution is the same as the rear planetary
ring gear] |
| (13) |
Counter driven gear (rotates
counterclockwise) |
| (14) |
Differential ring gear (rotates
clockwise) | |
| 6. |
"D"-6th gear
● Power transmission pathway [Operating
components: B1, C2]
Planetary gear unit
|
Input, Locked, Output
|
Front
|
-
|
Rear
|
Input: Carrier, Locked: Middle Sun gear, Output:
Ring gear
|
| (1) |
Input shaft (rotates clockwise) [same
revolution as the torque converter's turbine
runner] |
| (2) |
Intermediate shaft (rotates clockwise)
[same revolution as the torque converter's turbine
runner] |
| (3) |
B1-BRAKE [locks the rear planetary
middle sun gear] |
| (4) |
C2-CLUTCH [connects the intermediate
shaft and the rear planetary
carrier] |
| (5) |
Rear planetary carrier (rotates
clockwise) [same revolution as the intermediate
shaft] |
| (6) |
Rear planetary long pinion gear
(rotates clockwise on its axis, orbits clockwise)
[because the rear planetary middle sun
gear is locked, it is always in a speed increasing
condition] |
| (7) |
Rear planetary ring gear (rotates
clockwise)
[because the rear planetary long
pinion gear's rotation is added to the rear planetary carrier
revolution, the rear planetary ring gear revolution is faster
than those of the rear planetary
carrier] |
| (8) |
Counter drive gear (rotates
clockwise)
[because the rear planetary ring gear
is installed on the counter drive gear, the rotational
[because the rear planetary ring gear is installed on the
counter drive gear, the
rotational |
| (9) |
Counter driven gear (rotates
counterclockwise) |
| (10) |
Differential ring gear (rotates
clockwise) | |
| 7. |
"R"-Reverse gear
● Power transmission pathway [Operating
components: C3, B2]
Planetary gear unit
|
Input, Locked, Output
|
Front
|
Input: Ring gear, Locked: Sun gear, Output:
Carrier
|
Rear
|
Input: Middle Sun gear, Locked: Carrier, Output:
Ring gear
|
| (1) |
Input shaft (rotates clockwise) [same
revolution as the torque converter's turbine
runner] |
| (2) |
Front planetary ring gear (rotates
clockwise) [same revolution as the input
shaft] |
| (3) |
Front planetary pinion gear (rotates
clockwise on its axis, orbits clockwise)
[because the front planetary sun gear
is locked by the oil pump, it is pressed against the front
planetary ring gear and orbits the sun gear while rotating on
its axis (because the front planetary ring gear has internal
gears, the rotational direction does not
change)] |
| (4) |
Front planetary carrier (rotates
clockwise)
[reduction: same revolution as the
front planetary pinion gear orbit
revolution] |
| (5) |
C3-CLUTCH (rotates clockwise)
[connects the front planetary carrier and the rear planetary
middle sun gear] |
| (6) |
Rear planetary middle sun gear
(rotates clockwise)
[same revolutions as the C3-CLUTCH
(rotates slower than the input
shaft)] |
| (7) |
B2-BRAKE [locks the rear planetary
carrier] |
| (8) |
Rear planetary long pinion gear
(rotates counterclockwise) |
| (9) |
Rear planetary ring gear (rotates
counterclockwise)
[the rear planetary ring gear is
rotated by the rear planetary long pinion gear (because the
rear planetary ring gear has internal gears, the rotational
direction does not change)] |
| (10) |
Counter drive gear (rotates
counterclockwise)
[because the rear planetary ring gear
is installed on the counter drive gear, the rotational
direction and revolution are the same as the rear planetary
ring gear] |
| (11) |
Counter driven gear (rotates
clockwise) |
| (12) |
Differential ring gear (rotates
counterclockwise) | | |
