Infiniti Q45 (FY33). Manual — part 6
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FUNCTION OF CLUTCH AND BRAKE
Control members
Abbr.
Function
q
6
Reverse clutch
R/C
To transmit input power to front sun gear
q
9
.
q
7
High clutch
H/C
To transmit input power to front planetary carrier
q
11
.
q
16
Forward clutch
F/C
To connect front planetary carrier
q
11
with forward one-way clutch
q
17
.
q
18
Overrun clutch
O/C
To connect front planetary carrier
q
11
with rear internal gear
q
14
.
q
5
Brake band
B/B
To lock front sun gear
q
9
.
q
17
Forward one-way clutch
F/O.C
When forward clutch is engaged, to stop rear internal gear
q
14
from rotating in oppo-
site direction.
q
19
Low one-way clutch
L/O.C
At D
1
position, to prevent rear internal gear
q
14
from rotating in opposite direction.
q
20
Low & reverse brake
L & R/B
To lock rear internal gear
q
14
(2, 1
2
and 1
1
), to lock front planetary carrier
q
11
(R posi-
tion).
CLUTCH AND BAND CHART
Shift position
Reverse
clutch
q
6
High
clutch
q
7
Forward
clutch
q
16
Overrun
clutch
q
18
Band servo
Forward
one-
way
clutch
q
17
Low
one-
way
clutch
q
19
Low &
reverse
brake
q
20
Lock-up
Remarks
2nd
apply
3rd
release
4th
apply
P
PARK
POSITION
R
q
q
REVERSE
POSITION
N
NEUTRAL
POSITION
D*4
1st
q
*1
q
X
q
I
I
Automatic shift
1
)
2
)
3
)
4
2nd
q
*1
q
q
q
I
3rd
q
q
*1
q
q
*2
q
X
q
X
I
*5
q
4th
q
q
X
*3
q
X
q
X
q
q
2
1st
q
q
X
q
I
I
Automatic shift
1
)
2
+
3
2nd
q
q
q
q
I
1
1st
q
q
I
q
Locks (held sta-
tionary)
in 1st speed
1
+
2
+
3
2nd
q
q
q
I
*1: Operates when overdrive control switch is being set in “OFF” position.
*2: Oil pressure is applied to both 2nd “apply” side and 3rd “release” side of band servo piston. However, brake band does not contract because oil
pressure area on the “release” side is greater than that on the “apply” side.
*3: Oil pressure is applied to 4th “apply” side in condition *2 above, and brake band contracts.
*4: A/T will not shift to 4th when overdrive control switch is set in “OFF” position.
*5: Operates when overdrive control switch is “OFF”.
q
: Operates.
q
q
: Operates when throttle opening is less than 3/16, activating engine brake.
v
: Operates during “progressive” acceleration.
J
: Operates but does not affect power transmission.
q
X
q
: Operates when throttle opening is less than 3/16, but does not affect engine brake.
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-21
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POWER TRANSMISSION
“N” and “P” positions
I
“N” position
No control members operate. Power from the input shaft is not transmitted to the output shaft since the
clutch does not operate.
I
“P” position
Similar to the “N” position, no control members operate. The parking pawl interconnected with the select
lever engages with the parking gear to mechanically hold the output shaft so that the powertrain is locked.
SAT039J
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-22
![](/vehicles/zatt/fitanyou/tushi/himi.png)
“1
1
” position
Forward clutch
Forward one-way clutch
Overrun clutch
Low and reverse brake
As overrun clutch engages, rear internal gear is locked by the operation of low and reverse
brake.
This is different from that of D
1
and 2
1
.
Engine brake
Overrun clutch always engages, therefore engine brake can be obtained when decelerating.
Power flow
Input shaft
H
Rear sun gear
H
Rear planetary gear
E
Output shaft
SAT044J
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-23
![](/vehicles/zatt/fitanyou/tushi/jubew.png)
“D
1
” and “2
1
” positions
Forward one-way clutch
Forward clutch
Low one-way clutch
Rear internal gear is locked to rotate counterclockwise because of the functioning of these
three clutches. (Start-up at D
1
)
Overrun clutch
engagement conditions
(Engine brake)
D
1
: Overdrive control switch in “OFF”
Throttle opening less than 3/16
2
1
: Throttle opening less than 3/16
At D
1
and 2
1
positions, engine brake is not activated due to free turning of low one-way
clutch.
Power flow
Input shaft
H
Rear sun gear
H
Rear pinion gear
H
Rear planetary carrier
,
Output shaft
SAT040J
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-24
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