Mazda 5. Manual — part 24

05–17–16

AUTOMATIC TRANSAXLE

4GR

.

9

8

7

5

4

3

10

11

12

6

1

2

8

7

5

4

3

6

1

2

12

B3E0517T009

1

Input

2

2-4 brake band

3

3-4 clutch

4

Rear sun gear

5

Rear pinion gear

6

Rear internal gear

7

Front planetary carrier

8

Primary gear

9

Secondary gear

10

Output gear

11

Ring gear (Differential)

12

Output

AUTOMATIC TRANSAXLE

05–17–17

05

R position

.

End Of Sie

9

8

7

5

4

3

10

11

12

6

1

2

8

7

5

4

3

6

1

2

12

B3E0517T010

1

Input

2

Low and reverse brake

3

Reverse clutch

4

Rear sun gear

5

Rear pinion gear

6

Rear internal gear

7

Front planetary carrier

8

Primary gear

9

Secondary gear

10

Output gear

11

Ring gear (Differential)

12

Output

05–17–18

AUTOMATIC TRANSAXLE

FORWARD CLUTCH, 3-4 CLUTCH, REVERSE CLUTCH, LOW AND REVERSE BRAKE OUTLINE

B3E051701030A09

• Each multi-disc type clutch and brake has the following function and operates in the gear position(s) as shown

in the figure.

.

End Of Sie

FORWARD CLUTCH, 3-4 CLUTCH, REVERSE CLUTCH, LOW AND REVERSE BRAKE OPERATION

B3E051701030A10

• The basic structure is as shown in the figure below. In figure A, the fluid is in the clutch plates (drive plates,

driven plates) and the power is not transmitted because of the fluid slippage on each plate. Figure B shows the
clutch condition with the hydraulic pressure acted on the piston; the drive plates and the driven plates are
pressed tightly together to transmit the clutch drum rotation speed to the hub. When the hydraulic pressure in
the piston is drained, the clutches are separated because of the return spring and return to the condition in

Component

Function

Gear position

Forward clutch

• Transmits input torque from turbine shaft

to front sun gear.

1GR, 2GR, 3GR

3-4 clutch

• Transmits input torque from turbine shaft

to rear planetary carrier.

3GR, 4GR

Reverse clutch

• Transmits input torque from turbine shaft

to rear sun gear.

Reverse

Low and reverse brake

• Fixes rotation of front internal gear or rear

planetary carrier.

Reverse, 1GR (L range HOLD and M range)

8

7

5

4

3

6

1

2

B3E0517T004

1

Forward clutch

2

One-way clutch

3

Low and reverse brake

4

Front planetary gear

5

Rear planetary gear

6

2-4 brake band

7

Reverse clutch

8

3-4 clutch

AUTOMATIC TRANSAXLE

05–17–19

05

figure A.

.

• The dished plates used for the reverse clutch and the low and reverse brake reduce the shock caused by the

sudden clutch engagement. The piston check ball built in the 2-4 brake drum (reverse clutch) drains the ATF
only during freewheel to prevent the hydraulic pressure from increasing to half-engage the clutches because of
the residual ATF. In the forward clutch and the 3-4 clutch, the centrifugal balance chamber is installed opposite
the general clutch chamber. The centrifugal balance chamber is always filled with the ATF from the exclusive

3

2

1

A

B

B3E0517A001

1

Piston

2

Clutch drum

3

Clutch hub