Mitsubishi Outlander XL. Manual — part 1264

Operation and function

｠

Clutch pressure not in operation
When the clutch drum is rotated, the centrifugal
force works on the remaining transmission fluid in
clutch chamber, and the force pushes the clutch
piston. However, because the centrifugal force also
works on the transmission fluid charged in the
centrifugal cancel chamber, the clutch piston is
pushed back. Therefore, the clutch piston does not
move because both forces are cancelled by each
other, preventing the clutch drag.

｠

Clutch pressure in operation

When the clutch pressure works on the cylinder
chamber, the pressure overcomes the facing
centrifugal cancel chamber's hydraulic pressure
and the spring force. Consequently, the clutch
piston is pushed, and the clutch is engaged. At this
time, the centrifugal force that works on the clutch
pressure of cylinder chamber is cancelled out by the
centrifugal force that works on the centrifugal
cancel chamber. Therefore, the effects from
centrifugal force generated by the clutch drum
rotation will be eliminated. For this reason, the
constant clutch piston pushing force is obtained
with all rotations, and smooth shifting has been
achieved.

ZC600780

1

4

5

2

3

6

7

8

9

10

0000

1.

Clutch plate

2.

Clutch drum

3.

Cylinder chamber

4.

Return spring

5.

Centrifugal cancel chamber

6.

Clutch piston

7.

Dish plate

8.

Clutch disc

9.

Retaining plate

10.

Snap ring

One-way clutch

The type of one-way clutch adopted with this A/T is
called as "roller type." Depending on the direction of
torque application, the clutch engages by itself and

transfers the torque. It rotates freely to the opposite
direction, and does not transfer the torque.

23-8

AUTOMATIC TRANSAXLE

CONSTRUCTION AND OPERATION

STRUCTURE
With "roller type," the roller and spring are inserted
between the inner race of cylindrical surface and the

outer race with a number of tilted cam surfaces. This
type is composed of four parts.

OPERATION

｠

When the one-way clutch is operating
When the one-way clutch rotates toward the torque
transmission direction, the rollers move toward the
narrow side of the roller chamber, which is
composed of the inner race and the outer race.
Since the narrow side of the roller chamber is
smaller than the roller diameter, the rollers are
engaged between the cam surfaces of the outer
race and the cylindrical surface of the inner race,

and the inner race and the outer race rotate
together.

｠

When the one-way clutch is not operating
When the one-way clutch rotates toward the
direction opposite to the torque transmission, the
rollers move toward the wide side of the roller
chamber, which is composed of the inner race and
the outer race. Since the wide side of the roller
chamber is larger than the roller diameter, a
clearance is created between the roller chamber
and the rollers. Therefore, the inner race and the
outer race are released.

ZC6007810000

3

4

1

2

1.

Spring

2.

Outer race

3.

Inner race

4.

Roller

VALVE BODY ASSEMBLY

M22301000208USA0000010000

The valve body assembly plays its role as the core of
the A/T which performs "shift control", "hydraulic
pressure control", and "fluid distribution to lubrication

line". The components are the "body lower", "body
upper", "body inter", "separate plate", "solenoid
valve", "valve spool", "spring", and "check ball", and
all these parts require considerable precision.

Solenoid valve

There are two types of the solenoid valve adopted to
this A/T, "ON-OFF solenoid valve" and "linear
solenoid valve".

｠

ON-OFF solenoid valve

AUTOMATIC TRANSAXLE

23-9

CONSTRUCTION AND OPERATION

The valve spool installed inside the coil only operates so as to press or not to press the ball, which seals the
hydraulic pressure supply section, against the sheet surface. With this A/T, the normal low type is used.
When the voltage is not applied to the coil, the ball is pressed against the sheet surface by the force of built-
in spring, stopping the pilot pressure. When the voltage is applied to the coil, the valve is drawn to the right,
and the hydraulic pressure seal by the ball is released, supplying the pilot pressure to the operation sections.

ZC6007820000

To operation sections

Pilot pressure

Valve spool

Ball

｠

Linear solenoid valve
There are two types to this solenoid valve, the normal low type with which the control hydraulic pressure is
not generated when the voltage is not applied to the coil, and the normal high type which has an opposite
characteristics. The principle of solenoid valve is the phenomenon that the pushing force against the valve
spool installed inside the coil increases approximately in proportion to the electric current. By using this
pushing force, it can generate the hydraulic pressure proportionate to the force.

ZC6007830000

Normal low type

Normal high type

Characteristics diagram of normal high type

Feed back

OUT EX

OUT

EX

(P)

hydraulic
pressure

(P)

Current (A)

Current (A)

hydraulic
pressure

Characteristics diagram of normal low type

Plunger

Feed back

Plunger

IN

IN

23-10

AUTOMATIC TRANSAXLE

CONSTRUCTION AND OPERATION

PARKING MECHANISM

M22301000209USA0000010000

The parking mechanism immobilizes the vehicle in
combination with the side brake while the vehicle is
parked. This is interlocked with the vehicle's selector
lever, and it mechanically locks the parked vehicle so

that the vehicle does not move. Its components
includes the manual shaft, manual plate, rod plate,
parking rod, detent spring, parking pawl, and parking
gear.

Parking structure

1.

Select the parking position with the manual shaft.
(The detent feel of each range is determined by the
detent spring and the overstriding force over the
protrusion and depression of manual plate.)

2.

When the rod plate reaches the P position, the
parking rod is pressed down, and the rod slides in
the support actuator inner hole.

3.

At the parking rod cam, a force acts to turn the
parking pawl. Then, the pawl section of the parking
pawl is engaged with the parking gear.

4.

Because the parking gear which is spline-engaged
with the reduction gear will be fixed, the output axis
will also be fixed.

ZC600784

3

6

5

4

1

2

7

0000

1.

Rod plate

2.

Parking rod

3.

Parking pawl

4.

Parking gear

AUTOMATIC TRANSAXLE

23-11

CONSTRUCTION AND OPERATION