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STRUCTURE AND OPERATIONTM-17
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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1. Low brake 2. Drum support 3. Reverse brake
4. Direct clutch 5. High and low reverse clutch 6. 2nd one-way clutch
7.
*1Rear carrier 8. Mid carrier 9. Input clutch
10.
*2Front sun gear 11 .*3Front carrier 12. Under drive carrier
13. 1st one-way clutch 14. Front brake 15. 2346 brake
16.
*4Input shaft 17. Torque converter 18. Oil pump
19.
*2Under drive sun gear 20.*3Under drive internal gear21.*4Front internal gear
22. Mid sun gear 23.
*1Mid internal gear 24. Rear sun gear
25. Rear internal gear 26. High and low reverse clutch hub 27. Control valve & TCM
28. Parking gear 29. Adapter case 30. Output shaft
*1: 7 and 23 are one unit.
*2: 10 and 19 are one unit.
*3: 11 and 20 are one unit.
*4: 16 and 21 are one unit.
JSDIA1774ZZ
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TM-18
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
TRANSMISSION : System Diagram
INFOID:0000000006226763
TRANSMISSION : System DescriptionINFOID:0000000006226764
DESCRIPTION
JSDIA0877GB
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STRUCTURE AND OPERATIONTM-19
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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With the use of 4 sets of planetary gears, A/T enabl es 7-speed transmission for forward and 1-speed transmis-
sion for backward, depending on the combination of 3 sets of multiple-disc clutches, 4 sets of multiple-disc
brakes and 2 sets of one-way clutches.
CLUTCH AND BRAKE CHART
POWER TRANSMISSION
“N” Position
JSDIA1455GB
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TM-20
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
Since the low brake is released, torque from the input
shaft drive is not transmitted to the output shaft.
“P” Position
JSDIA0880GB
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STRUCTURE AND OPERATIONTM-21
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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The same as for the “N” position, since the low brake is released, so torque from the input shaft drive is not
transmitted to the output shaft.
The parking pawl linked with the selector lever mes hes with the parking gear and fastens the output shaft
mechanically.
“D1” Position
JSDIA1277GB
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TM-22
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
The 1st one-way clutch regulates countercloc
kwise rotation of the under drive carrier.
The 2nd one-way clutch regulates countercl ockwise rotation of the rear sun gear.
The mid sun gear is fixed by the low brake.
Each planetary gear enters the state described below.
JSDIA0866GB
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![INFINITI QX56 2011 Factory Service Manual
STRUCTURE AND OPERATIONTM-23
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Front planetary gear
Under drive planetary gear
Rear planetary gear
Mid planetary gear
“M1” Posi INFINITI QX56 2011 Factory Service Manual
STRUCTURE AND OPERATIONTM-23
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Front planetary gear
Under drive planetary gear
Rear planetary gear
Mid planetary gear
“M1” Posi](/manual-img/42/57033/w960_57033-5110.png)
STRUCTURE AND OPERATIONTM-23
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Front planetary gear
Under drive planetary gear
Rear planetary gear
Mid planetary gear
“M1” Position
Name Front sun gear Front carrier Front internal gear
Condition — Output Input
Direction of rotation Counterc lockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Deceleration from front internal
gear Deceleration from front internal
gear Same number of revolution as the
input shaft
Name Under drive sun gear Under drive carrier Under drive internal gear
Condition — Fixed Input/Output
Direction of rotation Counterclockwi se revolution — Clockwise revolution
Number of revolutions Acceleration from under drive in-
ternal gear —
Same number of revolution as the
front carrier
Name Rear sun gear Rear carrier Rear internal gear
Condition Fixed Output Input
Direction of rotation — Clockwise revolution Clockwise revolution
Number of revolutions — Deceleration from rear internal
gear Same number of revolution as the
under drive internal gear
Name Mid sun gear Mid carrier Mid internal gear
Condition Fixed Output Input
Direction of rotation — Clockwise revolution Clockwise revolution
Number of revolutions — Deceleration from mid internal
gear Same number of revolution as the
rear carrier
Revision: 2010 May2011 QX56
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TM-24
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
The 1st one-way clutch and the front brake regulate c
ounterclockwise rotation of the under drive carrier.
NOTE:
The front brake operates only while coasting.
The 2nd one-way clutch and the high and low reverse clutch regulate counterclockwise rotation of the rear
sun gear.
NOTE:
The high and low reverse clutch operates only while coasting.
The mid sun gear is fixed by the low brake.
JSDIA0867GB
Revision: 2010 May2011 QX56