Mazda 5. Manual — part 27

05–17–28

AUTOMATIC TRANSAXLE

Third gear

.

Gear rotation speed

• Here we have the result on N

R

=N

S

.

• Suppose gear ratio in third gear is i

3

,

i

3

=N

R

/N

C

• From the result of N

R

=N

S

in formula (1), the relation between the gear ratio in third gear and the rotation speed

of the front planetary gar set is indicated in the formula below.
(N

RF

+Z

SF

) N

C

= (Z

RF

+Z

SF

) N

R

Therefore,
i

3

=N

R

/N

C

= (Z

RF

+Z

SF

) / (Z

RF

+Z

SF

) = (89+49) / (89+49) =1.000

As a result, the gear ratio in third gear is 1.000.

Fourth gear

.

Gear rotation speed

• Suppose gear ratio in fourth gear is i

4

,

i

4

=N

C

/N

R

• From the result of N

S

=0 in formula (2), the relation between the gear ratio in fourth gear and the rotation speed

of the rear planetary gear set is indicated in the formula below.
(Z

RR

+Z

SR

) N

C

=Z

RR

N

R

Therefore,
i

4

=N

C

/N

R

=Z

RR

/ (Z

RR

+Z

SR

) =98/ (98+37) =0.7259

As a result, the gear ratio in fourth gear is 0.725.

1

Front planetary gear

2

Sun gear N

S

(input)

3

Internal gear N

R

(input)

4

Planetary carrier N

C

(output)

5

Pinion gear

Planetary gear

Front

Internal gear

N

R

(input)

Planetary carrier

N

C

(output)

Sun gear

N

S

(input)

5

4

3

1

2

B3E0517A010

1

Rear planetary gear

2

Sun gear (fix)

3

Internal gear N

R

(output)

4

Planetary carrier N

C

(input)

5

Pinion gear

Planetary gear

Rear

Internal gear

N

R

(output)

Planetary carrier

N

C

(input)

Sun gear

0 (fix)

5

4

3

1

2

B3E0517A011

AUTOMATIC TRANSAXLE

05–17–29

05

Reverse

.

Gear rotation speed

• Suppose gear ratio in reverse gear is i

REV

,

i

REV

=N

S

/N

R

• From the result of N

C

=0 in formula (2), the relation between the gear ratio during reverse movement and the

rotation speed of the planetary gar set is indicated in the formula below.
(Z

RR

+Z

SR

) 0=Z

RR

N

R

+Z

SR

N

S

Therefore,
i

REV

=N

S

/N

R

=Z

RR

/Z

SR

=–98/37=–2.6486

As a result, the gear ratio in reverse is 2.648.

End Of Sie

PARKING MECHANISM OUTLINE

B3E051701030A23

• When the selector lever is shifted to P position, the parking pawl engages the parking gear and locks the output

gear (i.e., rotation of the driving wheels).

End Of Sie

PARKING MECHANISM STRUCTURE

B3E051701030A24

• The parking pawl is installed in the transaxle case via the parking pawl shaft and pushed to the support

actuator by the return spring except in P position.
The parking rod component is designed to slide on the support actuator and connected to the manual plate.

End Of Sie

PARKING MECHANISM OPERATION

B3E051701030A25

• When the selector lever is moved to P position, the manual shaft and the manual plate move in the direction of

the arrow A to the position as shown in the figure below. Then the parking rod component moves in the
direction of the arrow B, the parking rod component cam pushes up the parking pawl, and the parking pawl
engages the parking gear.
If the parking pawl hits the tooth of the parking gear, the parking pawl cannot be pushed up, so only the parking
rod component is able to move. The cam presses the spring onto the parking pawl and the actuator. If the
vehicle runs even a little under this condition, the wheels rotate and parking gear also rotates slightly. As a
result, the parking pawl slides into the groove, and engages the parking gear.
Thus, the parking mechanism prevents the vehicle from moving in P position.

1

Rear planetary gear

2

Sun gear N

S

(input)

3

Internal gear N

R

(output)

4

Planetary carrier (fix)

5

Pinion gear

Planetary gear

Rear

Internal gear

N

R

(output)

Planetary carrier

0 (fix)

Sun gear

N

S

(input)

5

4

3

1

2

B3E0517A012

05–17–30

AUTOMATIC TRANSAXLE

.

End Of Sie

OUTPUT GEAR OUTLINE

B3E051719220A01

• The two-step final drive mechanism is adopted by arranging the secondary gear and the output gear on the

A

B

9

8

7

5

4

3

10

6

1

2

5

11

6

B3E0517A013

1

Parking gear

2

Parking pawl

3

Parking pawl shaft

4

Pawl return spring

5

Cam (parking rod component)

6

Support actuator

7

Actuator plate

8

Spring (parking rod component)

9

Parking assist lever component

10

Parking rod (parking rod component)

11

Manual plate

AUTOMATIC TRANSAXLE

05–17–31

05

output gear shaft to miniaturize the transaxle.

.

End Of Sie

OIL PUMP OUTLINE

B3E051719220A02

• The light-weight, compact, and quiet trochoid gear type oil pump is adopted to reduce the pump driving torque.

5

3

4

1

2

B3E0517T013

1

Primary gear

2

Secondary gear

3

Output gear

4

Differential

5

Power flow