Infiniti F50. Manual — part 33
A/T CONTROL SYSTEM
AT-17
D
E
F
G
H
I
J
K
L
M
A
B
AT
Shift Mechanism
ECS0082P
The automatic transmission uses compact dual planetary gear systems to improve power-transmission effi-
ciency, simplify construction and reduce weight.
It also employs an optimum shift control and super wide gear ratios. They improve starting performance and
acceleration during medium and high-speed operation.
CONSTRUCTION
FUNCTION OF CLUTCH AND BRAKE
1.
Front brake
2.
Input clutch
3.
Direct clutch
4.
High and low reverse clutch
5.
Reverse brake
6.
Forward brake
7.
Low coast brake
8.
1st one-way clutch
9.
Forward one-way clutch
10. 3rd one-way clutch
11.
Front sun gear
12. Input shaft
13. Mid internal gear
14.
Front internal gear
15. Rear carrier
16. Rear sun gear
17.
Mid sun gear
18. Front carrier
19. Mid carrier
20.
Rear internal gear
21. Output shaft
22. Parking gear
23.
Parking pawl
PCIA0002J
Name of the Part
Abbreviation
Function
Front brake (1)
Fr/B
Fastens the front sun gear (11).
Input clutch (2)
I/C
Connects the input shaft (12), the front internal gear (14) and the mid internal
gear (13).
Direct clutch (3)
D/C
Connects the rear carrier (15) and the rear sun gear (16).
High and low reverse clutch (4)
H&LR/C
Connects the mid sun gear (17) and the rear sun gear (16).
Reverse brake (5)
R/B
Fastens the rear carrier (15).
Forward brake (6)
F/B
Fastens the mid sun gear (17).
Low coast brake (7)
LC/B
Fastens the mid sun gear (17).
1st one-way clutch (8)
1st/O.C
Allows the rear sun gear (16) to turn freely forward relative to the mid sun gear
(17) but fastens it for reverse rotation.
Forward one-way clutch (9)
F/O.C
Allows the mid sun gear (17) to turn freely in the forward direction but fastens it
for reverse rotation.
3rd one-way clutch (10)
3rd/O.C
Allows the front sun gear (11) to turn freely in the forward direction but fastens
it for reverse rotation.
AT-18
A/T CONTROL SYSTEM
CLUTCH AND BAND CHART
SCIA1524E
A/T CONTROL SYSTEM
AT-19
D
E
F
G
H
I
J
K
L
M
A
B
AT
POWER TRANSMISSION
“N” position
Since both the forward brake and the reverse brake are released, torque from the input shaft drive is not trans-
mitted to the output shaft.
“P” position
●
The same as for the “N” position, both the forward brake and the reverse brake are released, so torque
from the input shaft drive is not transmitted to the output shaft.
●
The parking pawl linked with the select lever meshes with the parking gear and fastens the output shaft
mechanically.
1.
Front brake
2.
Input clutch
3.
Direct clutch
4.
High and low reverse clutch
5.
Reverse brake
6.
Forward brake
7.
Low coast brake
8.
1st one-way clutch
9.
Forward one-way clutch
10. 3rd one-way clutch
11.
Front sun gear
12. Input shaft
13. Mid internal gear
14. Front internal gear
15. Rear carrier
16. Rear sun gear
17. Mid sun gear
18. Front carrier
19. Mid carrier
20. Rear internal gear
21. Output shaft
22. Parking gear
23. Parking pawl
PCIA0003J
AT-20
A/T CONTROL SYSTEM
“D”, “M2”, “M3”, “M4”, “M5” positions 1st gear
●
The forward brake and the forward one-way clutch regulate reverse rotation of the mid sun gear.
●
The first one-way clutch regulates reverse rotation of the rear sun gear.
●
The third one-way clutch regulates reverse rotation of the front sun gear.
●
During deceleration, the mid sun gear turns forward, so the forward one-way clutch idles and the engine
brake is not activated.
1.
Front brake
2.
Input clutch
3.
Direct clutch
4.
High and low reverse clutch
5.
Reverse brake
6.
Forward brake
7.
Low coast brake
8.
1st one-way clutch
9.
Forward one-way clutch
10. 3rd one-way clutch
11.
Front sun gear
12. Input shaft
13. Mid internal gear
14. Front internal gear
15. Rear carrier
16. Rear sun gear
17. Mid sun gear
18. Front carrier
19. Mid carrier
20. Rear internal gear
21. Output shaft
22. Parking gear
23. Parking pawl
SCIA1512E
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