Infiniti Q45 (FY33). Manual — part 7
![](/vehicles/zatt/fitanyou/tushi/wher.png)
“D
2
”, “2
2
” and “1
2
” positions
Forward clutch
Forward one-way clutch
Brake band
Rear sun gear drives rear planetary carrier and combined front internal gear. Front internal gear
now rotates around front sun gear accompanying front planetary carrier.
As front planetary carrier transfers the power to rear internal gear through forward clutch and
forward one-way clutch, this rotation of rear internal gear increases the speed of rear planetary
carrier compared with that of the 1st speed.
Overrun clutch
engagement conditions
D
2
: Overdrive control switch in “OFF”
Throttle opening less than 3/16
2
2
: Throttle opening less than 3/16
1
2
: Always engaged
Power flow
Input shaft
E
Rear sun gear
Front internal gear
E
H
G
[
Rear planetary carrier
]
E
Output shaft
Front internal gear
H
Front planetary carrier
H
Rear internal gear
SAT041J
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-25
![](/vehicles/zatt/fitanyou/tushi/ellohas.png)
“D
3
” position
High clutch
Forward clutch
Forward one-way clutch
Input power is transmitted to front planetary carrier through high clutch. And front planetary carrier
is connected to rear internal gear by operation of forward clutch and forward one-way clutch.
This rear internal gear rotation and another input (the rear sun gear) accompany rear planetary
carrier to turn at the same speed.
Overrun clutch
engagement conditions
D
3
: Overdrive control switch in “OFF”
Throttle opening less than 3/16
Power flow
Input shaft
H
High clutch
H
Front planetary carrier
H
H
Forward clutch
Rear sun gear
H
Forward one-way clutch
H
Rear internal gear
H
Rear planetary carrier
E
Output shaft
SAT042J
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-26
![](/vehicles/zatt/fitanyou/tushi/miaverith.png)
“D
4
” (OD) position
High clutch
Brake band
Forward clutch
(Does not affect power transmis-
sion)
Input power is transmitted to front carrier through high clutch.
This front planetary carrier turns around the sun gear which is fixed by brake band and makes
front internal gear (output) turn faster.
Engine brake
At D
4
position, there is no one-way clutch in the power transmission line and engine brake can
be obtained when decelerating.
Power flow
Input shaft
Front internal gear
H
H
High clutch
Rear planetary carrier
H
H
Front planetary carrier
Output shaft
H
Front pinion gear
E
SAT043J
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-27
![](/vehicles/zatt/fitanyou/tushi/zae.png)
“R” position
Reverse clutch
Low and reverse brake
Front planetary carrier is stationary because of the operation of low and reverse brake.
Input power is transmitted to front sun gear through reverse clutch, which drives front inter-
nal gear in the opposite direction.
Engine brake
As there is no one-way clutch in the power transmission line, engine brake can be obtained
when decelerating.
Power flow
Input shaft
H
Reverse clutch
H
Front pinion gear
F
Front sun gear
H
Front internal gear
E
Output shaft
SAT045J
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-28
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