INFINITI QX56 2011 Factory Service Manual

STRUCTURE AND OPERATIONTM-33
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Front planetary gear
Under drive planetary gear
Rear planetary gear
Mid planetary gear
“D5” and “M5” Positions
Name Front sun gear Front carrier Front internal gear
Condition Fixed Output Input
Direction of rotation — Clockwise revolution Clockwise revolution
Number of revolutions — 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 — Clockwise revolution Clockwise revolution
Number of revolutions — Deceleration from under drive in-
ternal gear Same number of revolution as the
front carrier
Name Rear sun gear Rear carrier Rear internal gear
Condition — Output Input
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Same number of revolution as the
rear internal gear Same number of revolution as the
rear internal gear Same number of revolution as the
under drive internal gear
Name Mid sun gear Mid carrier Mid internal gear
Condition — Output Input
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Same number of revolution as the
mid internal gear Same number of revolution as the
mid internal gear Same number of revolution as the
rear carrier
Revision: 2010 May2011 QX56

TM-34
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
 The input clutch gets engaged and connects the mid internal gear with the rear carrier.
 The direct clutch gets engaged and connects the rear sun gear with the rear carrier.
 The high and low reverse clutch gets engaged and connec
ts the rear sun gear with the mid sun gear.
 Each planetary gear enters the state described below.
JSDIA0872GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-35
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Rear planetary gear
Mid planetary gear
“D6” and “M6” Positions
Name Rear sun gear Rear carrier Rear internal gear
Condition — input/Output —
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Same number of revolution as the
rear carrier Same number of revolution as the
input shaft Same number of revolution as the
rear carrier
Name Mid sun gear Mid carrier Mid internal gear
Condition — Output Input
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Same number of revolution as the
mid internal gear Same number of revolution as the
mid internal gear Same number of revolution as the
input shaft
Revision: 2010 May2011 QX56

TM-36
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
 The front sun gear and the under drive sun gear are fixed by the 2346 brake.
 The input clutch gets engaged and connects the mid internal gear with the rear carrier.
 The high and low reverse clutch gets engaged and connec
ts the rear sun gear with the mid sun gear.
 Each planetary gear enters the state described below.
JSDIA0873GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-37
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Front planetary gear
Rear planetary gear
Mid planetary gear
“D7” and “M7” Positions
Name Front sun gear Front carrier Front internal gear
Condition Fixed Output Input
Direction of rotation — Clockwise revolution Clockwise revolution
Number of revolutions — Deceleration from front internal
gear Same number of revolution as the
input shaft
Name Rear sun gear Rear carrier Rear internal gear
Condition — Input/Output Input
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Acceleration from rear carrier Same number of revolution as the
input shaft Same number of revolution as the
front carrier
Name Mid sun gear Mid carrier Mid internal gear
Condition — Output Input
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Acceleration from mid internal gear Acceleration from mid internal gear Same number of revolution as the
input shaft
Revision: 2010 May2011 QX56

TM-38
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
 The under drive carrier is fixed by the front brake.
 The input clutch gets engaged and connects the mid internal gear with the rear carrier.
 The high and low reverse clutch gets engaged and connec
ts the rear sun gear with the mid sun gear.
 Each planetary gear enters state described below.
JSDIA0874GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-39
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
Front planetary gear
Under drive planetary gear
Rear planetary gear
Mid planetary gear
“R” Position
Name Front sun gear Front carrier Front internal gear
Condition — Output Input
Direction of rotation Counterclockwise 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 inter-
nal gear —
Same number of revolution as the
front carrier
Name Rear sun gear Rear carrier Rear internal gear
Condition — Input/Output Input
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Acceleration from rear carrier Same number of revolution as the
input shaft Same number of revolution as the
under drive internal gear
Name Mid sun gear Mid carrier Mid internal gear
Condition — Output Input
Direction of rotation Clockwise revolution Clockwise revolution Clockwise revolution
Number of revolutions Acceleration from mid internal gear Acceleration from mid internal gear Same number of revolution as the
input shaft
Revision: 2010 May2011 QX56

TM-40
< 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 at the fixed speed or less.
 The rear carrier and the mid internal gear are fixed by the reverse brake.
 The mid sun gear rotates at the same speed as the rear sun gear by operation of the 2nd one-way clutch
and the high and low reverse clutch.
NOTE:
The high and low reverse clutch operates at the fixed speed or less.
JSDIA0875GB
Revision: 2010 May2011 QX56

STRUCTURE AND OPERATIONTM-41
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
 Each planetary gear enters the state described below.
Front planetary gear
Under drive planetary gear
Rear planetary gear
Mid planetary gear
TRANSMISSION : Component DescriptionINFOID:0000000006226765
FLUID COOLER & FLUID WARMER SYSTEM
FLUID COOLER & FLUID WARMER SYSTEM : System DescriptionINFOID:0000000006226766
The A/T fluid temperature is controlled to an appropriate level by the A/T fluid cooler and A/T fluid warmer.
Name Front sun gear Front carrier Front internal gear
Condition — Output Input
Direction of rotation Counterclockwise 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 inter-
nal gear —Same number of revolution as the
front carrier
Name Rear sun gear Rear carrier Rear internal gear
Condition Output Fixed Input
Direction of rotation Counterclockwi se revolution — Clockwise revolution
Number of revolutions Acceleration from rear internal
gear —Same number of revolution as the
under drive internal gear
Name Mid sun gear Mid carrier Mid internal gear
Condition Input Output Fixed
Direction of rotation Counterclockwise revolution Counterclockwise revolution —
Number of revolutions Same number of revolution as the
rear sun gear Deceleration from mid sun gear —
Name of the Part (Abbreviation) Function
Front brake (FR/B) Fastens the under drive carrier.
Input clutch (I/C) Connects the input shaft, the mid internal gear and the rear carrier.
Direct clutch (D/C) Connects the rear carrier and the rear sun gear.
High and low reverse clutch (HLR/C) Connects the rear sun gear and the mid sun gear.
Reverse brake (R/B) Fastens the rear carrier.
Low brake (L/B) Fastens the mid sun gear.
2346 brake (2346/B) Fastens the under drive sun gear.
1st one-way clutch (1st OWC) Allows the under drive carrier to turn freely in the forward direction but fastens it for reverse
rotation.
2nd one-way clutch (2nd OWC) Allows the rear sun gear to turn freely in the forward direction but fastens it for reverse ro-
tation.
Torque converter Amplifies driving force the engine, and transmits it to transmission input shaft.
Oil pump Driven by the engine, oil pump supplies oil to torque converter, control valve assembly, and
each lubricating system.
Revision: 2010 May2011 QX56

TM-42
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
A/T FLUID COOLER SCHEMATIC
COMPONENT DESCRIPTION
A/T fluid warmer
 The A/T fluid warmer (1) is installed on the front part of cylinder
block of engine.
 When engine is started while engine and A/T are cold, engine cool-
ant temperature rises more quickly than A/T fluid temperature. A/T
fluid warmer is provided with two circuits for ATF and engine cool-
ant respectively so that warmed engine coolant warms ATF
quickly. This helps shorten A/T warming up time, improving fuel
economy.
 A cooling effect is obtained when A/T fluid temperature is high.
A/T fluid cooler (with bypass valve)
 A/T fluid cooler (1) is installed in the front of radiator (2) and con- denser (3).
 A/T fluid cooler is provided with a bypass valve that controls ATF
flow. Bypass valve operates by thermo wax and a return spring.
Bypass valve fully opens when A/T fluid temperature is approxi-
mately 90 °C (194 °F) and fully closes when A/T fluid temperature is
approximately 100 °C (212 °F).
 When A/T fluid temperature is low, the bypass valve is open. Most of ATF therefore returns to the transmission without flowing into the
cooler core that has larger flow resistance.
JSDIA1803GB
JSDIA1811ZZ
JSDIA1814ZZ
JSDIA1815GB
Revision: 2010 May2011 QX56