Mitsubishi Evolution X. Manual — part 79
DIFFERENTIAL
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REAR AXLE
27-3
CONSTRUCTION DIAGRAM
DIFFERENTIAL
M2270001000548
The AYC differential is adopted, and has the follow-
ing features:
• The AYC differential consists of differential mech-
anism, acceleration/deceleration gear and two
pairs of wet multi-plate clutch.
• In order to increase torque transfer amount,
shaft-to-shaft coupling, which directly transmits
torque between LH and RH wheels, has been
adopted for the AYC differential.
• In order to achieve shaft-to-shaft coupling, a plan-
etary gear has been adopted for the differential
mechanism.
• Cornering ability: When the torque transfer
amount is increased between LH and RH wheels,
the yaw moment is also increased to raise the
cornering limit, as well as to reduce understeer
characteristics.
• Traction ability: Traction ability (LSD effect) is
increased when the rear inner wheel looses con-
tact with the ground during high-gravity cornering,
or when the road conditions for LH and RH
wheels largely differ.
NOTE:
.
•
For the AYC (Active Yaw Control), refer to
GROUP 22A
−
Super All Wheel Control (S-AWC)
−
Information of construction and operation
AC706664
ETJ
EBJ
AB
AC608248
ETJ
AYC differential
Rear driveshaft
(LH)
Rear driveshaft
(RH)
Rear wheel bearing
Oil seal
Magnetic
encoder
Rear wheel
hub assembly
Magnetic encoder
protection cover
Rear
driveshaft
nut
Split pin
Rear wheel
hub assembly
DIFFERENTIAL
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REAR AXLE
27-4
SPECIFICATIONS
DIFFERENTIAL
DIFFERENTIAL MECHANISM
When the vehicles turns, admits the revolution differ-
ence between inner wheel and outer wheel.
ACCELERATION/DECELERATION GEAR
Have the revolution speed of right and left wet
multi-plate clutch to accelerate or decelerate as
opposed to the revolution speed of right wheel.
WET MULTI-PLATE CLUTCH
Have the torque to move from high speed wheel to
low speed wheel.
LH clutch operate: deceleration gear have the torque
to move RH wheel to LH wheel.
RH clutch operate: acceleration gear have the torque
to move LH wheel to RH wheel.
The movement of torque is dependent on pushing
force of the clutch.
Item
Specification
Differential type
AYC differential
Reduction gear type
Hypoid gear
Reduction ratio
3.307
Number of teeth
Drive gear
43
Drive pinion
13
Bearing (Outside diameter
×
inside diameter) mm (in)
Side
72
× 37 (2.8 × 1.5) <LH>,
92
× 67 (3.6 × 2.6) <RH>
Front
62
× 25 (2.4 × 1.0)
Rear
72
× 35 (2.8 × 1.4)
AC211326AC
LH clutch
RH clutch
Wet multi-plate clutch
Differential mechanism
(Planetary gear)
Input
gear
Overdrive
gear
Reduction
gear
Acceleration/deceleration gear
DIFFERENTIAL
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REAR AXLE
27-5
AYC DIFFERENTIAL MECHANISM
When high speed clutch is pushed, the driving power always
moves from high speed side to low speed side, and controls
the driving power with the aid of the property which the move-
ment of driving power is proportional to the pushing force of
clutch.
In AYC differential, acceleration/deceleration gear always
engages, and toward to input speed from the differential mech-
anism, LH clutch engaging deceleration gear rotates in low
speed, and RH clutch engaging acceleration gear rotates in
high speed.
In other hand, the housing side of RH/LH clutch is integrated to
rear RH axle and if RH or LH clutch is operated, the driving
power can be moved to right or left.
THE FLOW OF DRIVING POWER
1. LH CLUTCH OPERATE
In order to boost the driving power of LH wheel, when LH
clutch is operated, a part of the driving power of RH wheel
flows to the differential mechanism, the driving power of LH
wheel is boosted. The result of this, the yaw moment occurs
in a right to the vehicle.
2. RH CLUTCH OPERATE
In order to boost the driving power of RH wheel, when RH
clutch is operated, a part of the driving power of LH wheel
flows to the differential mechanism, the driving power of RH
wheel is boosted. The result of this, the yaw moment occurs
in a left to the vehicle.
AC310373
High speed
side
Low speed
side
Pushing
force
Pushing
force
Driving power moves
LH
clutch
RH
clutch
Differential
mechanism
Acceleration/deceleration gear
AC
AC310374AC
LH clutch
Driving
power
(small)
Driving
power
(large)
Turning
direction
Yaw
moment
AC310375 AC
RH
clutch
Driving
power
(small)
Driving
power
(large)
Turning
direction
Yaw
moment
DIFFERENTIAL
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REAR AXLE
27-6
DIFFERENTIAL MOUNT
The front side of the differential carrier assembly is
installed to the rear suspension crossmember via the
differential mount bracket (LH/RH), and the rear side
of the assembly is installed via the differential mount
bracket (AYC differential), differential support
bracket, and rear differential mount insulator. As
described above, 3-point support and optimization of
bushing position for the differential mount are estab-
lished, reducing vibration and noise.
AC704692 AB
Differential support
bracket
Differential mount
bracket
Differential mount
bracket (LH)
Differential mount
bracket (RH)
Differential carrier
assembly
Rear suspension
crossmember
Rear differential
mount insulator
Lower stopper
Upper stopper
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