Nissan Terrano model r20 series 2004. Instruction — part 206
Cross-sectional View
SAT125BA
OVERALL SYSTEM
AT-8
Hydraulic Control Circuits
SAT624GA
OVERALL SYSTEM
AT-9
Shift Mechanism
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
q
1
Torque converter clutch piston
q
2
Torque converter
q
3
Oil pump
q
4
Input shaft
q
5
Brake band
q
6
Reverse clutch
q
7
High clutch
q
8
Front pinion gear
q
9
Front sun gear
q
10
Front internal gear
q
11
Front planetary carrier
q
12
Rear sun gear
q
13
Rear pinion gear
q
14
Rear internal gear
q
15
Rear planetary carrier
q
16
Forward clutch
q
17
Forward one-way clutch
q
18
Overrun clutch
q
19
Low one-way clutch
q
20
Low & reverse brake
q
21
Parking pawl
q
22
Parking gear
q
23
Output shaft
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 opposite
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 position).
SAT509I
OVERALL SYSTEM
AT-10
CLUTCH AND BAND CHART
Shift position
q
6
Reverse
clutch
q
7
High
clutch
q
16
Forward
clutch
q
18
Overrun
clutch
Band servo
q
17
Forward
one-
way
clutch
q
19
Low
one-
way
clutch
q
20
Low &
reverse
brake
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
v
v
Automatic shift
1
)
2
)
3
)
4
2nd
q
*1
q
v
3rd
q
q
*1
*2
v
4th
q
*3
q
q
2
1st
q
v
v
Automatic shift
1
)
2
2nd
q
q
v
1
1st
q
q
v
q
Locks (held sta-
tionary)
in 1st speed
1
+
2
2nd
q
q
q
v
*1: Operates when overdrive control or A/T mode switch is being set in “OFF” or “SPORT” 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 or A/T mode switch is set in “OFF” or “SPORT” position.
q
: Operates.
: Operates when throttle opening is less than 3/16, activating engine brake.
v
: Operates during “progressive” acceleration.
: Operates but does not affect power transmission.
: Operates when throttle opening is less than 3/16, but does not affect engine brake.
OVERALL SYSTEM
Shift Mechanism (Cont’d)
AT-11
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