Infiniti QX4 (R50). Manual — part 4
Circuit Diagram
NBAT0008
MAT906A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OVERALL SYSTEM
Circuit Diagram
AT-13
Cross-sectional View
NBAT0010
SAT150K
OVERALL SYSTEM
Cross-sectional View
AT-14
Hydraulic Control Circuit
NBAT0011
SAT151K
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OVERALL SYSTEM
Hydraulic Control Circuit
AT-15
Shift Mechanism
NBAT0012
The automatic transmission uses compact, dual planetary gear systems to improve power-transmission
efficiency, simplify construction and reduce weight.
It also employs an optimum shift control and superwide gear ratios. They improve starting performance and
acceleration during medium and high-speed operation.
Two one-way clutches are also employed: one is used for the forward clutch and the other for the low clutch.
These one-way clutches, combined with four accumulators, reduce shifting shock to a minimum.
CONSTRUCTION
NBAT0012S01
SAT509I
1.
Torque converter clutch piston
2.
Torque converter
3.
Oil pump
4.
Input shaft
5.
Brake band
6.
Reverse clutch
7.
High clutch
8.
Front pinion gear
9.
Front sun gear
10. Front internal gear
11. Front planetary carrier
12. Rear sun gear
13. Rear pinion gear
14. Rear internal gear
15. Rear planetary carrier
16. Forward clutch
17. Forward one-way clutch
18. Overrun clutch
19. Low one-way clutch
20. Low & reverse brake
21. Parking pawl
22. Parking gear
23. Output shaft
FUNCTION OF CLUTCH AND BRAKE
NBAT0012S02
Clutch and brake components
Abbr.
Function
Reverse clutch 6
R/C
To transmit input power to front sun gear 9.
High clutch 7
H/C
To transmit input power to front planetary carrier 11.
Forward clutch 16
F/C
To connect front planetary carrier 11 with forward one-way
clutch 17.
Overrun clutch 18
O/C
To connect front planetary carrier 11 with rear internal gear 14.
Brake band 5
B/B
To lock front sun gear 9.
Forward one-way clutch 17
F/O.C
When forward clutch 16 is engaged, to stop rear internal gear
14 from rotating in opposite direction against engine revolution.
Low one-way clutch 19
L/O.C
To stop front planetary carrier 11 from rotating in opposite direc-
tion against engine revolution.
Low & reverse brake 20
L & R/B
To lock front planetary carrier 11.
OVERALL SYSTEM
Shift Mechanism
AT-16
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