Mitsubishi Lancer Evolution 7. Manual — part 19
DRIVETRAIN -
Rear Axle
2-29
REAR AXLE
The rear axle consists of rear hubs, wheel bearings,
drive shafts, and rear differentialand, it has the
following features.
D
The wheel bearing is a unit bearing (double-row
angular contact ball bearing).
D
The drive shaft incorporates B.J.-T.J. type
constant velocity joints with high transmission
efficiency and low vibration and noise.
D
ABS rotors for detecting the wheel speeds are
press-fitted to the B.J. outer wheels in vehicles
with ACD or ABS.
NOTE
1. B.J.: Birfield Joint
2. T.J.: Tripod Joint
SPECIFICATIONS
Item
Vehicles without AYC
Vehicles with AYC
Wheel
bearings
Wheel bearing type
Unit bearing (Double-row angular contact ball
bearing)
g
Bearing (outside diameter × inside diameter) mm
78 × 40
Drive
shaft
Joint type
Outside
B.J.
shaft
Inside
T.J.
Shaft length*
1
× Shaft diameter
mm
Left
483 × 25
426 × 25
mm
Right
573 × 25
446 × 25
NOTE
*
1
: The shaft length indicates the length between the center points of each joint.
STRUCTURAL DIAGRAM
Oil seal
Rear hub
Differential carrier
B.J.
Drive shaft
T.J.
DRIVETRAIN -
Differential
2-30
DIFFERENTIAL
Mechanical type Limited Slip Differential <Vehicles without AYC> or Torque transfer differential <Vehicles
with AYC> is adopted. About the structure of AYC, refer to P.2-3, manual transmission.
MECHANICAL LIMITED SLIP DIFFERENTIAL
SPECIFICATIONS
Item
Mechanical LSD
Reduction gear type
Hypoid gear
Reduction ratio
3.312
Differential gear type (Type ×
b
f
)
Side gear
Straight bevel gear × 2
g
yp
( yp
number of gears)
Pinion gear
Straight bevel gear × 4
Number of teeth
Drive gear
43
Drive pinion
13
Side gear
14
Pinion gear
10
Bearings (Outside diameter ×
I id di
t )
Side
72.0 × 35.0
g
(
Inside diameter) mm
Front
62.0 × 25.0
Rear
72.0 × 35.0
CONSTRUCTION DIAGRAM
Differential carrier
<Mechanical LSD>
DRIVETRAIN -
Differential
2-31
TORQUE TRANSFER DIFFERENTIAL
The torque transfer differential consists of differential mechanism,acceleration/decelation gear and two
pairs of wet multi-plate clutch. The hipoid gear oil is used to lublicate differential part, ATF-SP III is used
to lublicate torque movement part (acceleration/decelation gear and clutch).
Differential
mechanism
L.H. clutch
Wet multi-plate clutch
R.H. clutch
Reductiongear
Overdrive gear
Input gear
Acceleration/decelation gear
DIFFERENTIAL MECHANISM
When the vehicle turns, admits the revolution difference between inner race and outer race.
ACCELERATION/DECELATION GEAR
Have the revolution speed of right and left wet multi-plate clutch to accelerate or decelate as oposed
to the revolution speed of right wheel.
WET MULTI-PLATE CLUTCH
Have the torque to move from high speed wheel to low speed wheel.
L.H. clutch operate: decelation geer have the torque to move R.H. wheel to L.H. wheel.
R.H. clutch operate: accelelation geer have the torque to move L.H. wheel to R.H. wheel.
The movement of torque is dependence on pushing force of the clutch.
DRIVETRAIN -
Differential
2-32
TORQUE TRANSFER 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
movement of driving power is proportional to the pushing
force of clutch.
In torque transfer differential, acceleration/decelation gear
always engages, and towerd to input speed from the
differential case, L.H. clutch engaging decelation gear is
revolutes in low speed, R.H. clutch engaging accelelation
gear is revolutes in high speed.
In the other hand, the housing side of R.H/L.H. clutch is
integlated to rear R.H. axle, if R.H. or L.H. clutch is opelated,
the driving power can be moved to right or left.
THE FLOW OF DRIVING POWER
(1) L.H.CLUTCH OPERATE
In order to boost the driving power of L.H. wheel, when
L.H.clutch is operated,a part of the driving power of R.H.
wheel flows to the differential case, the driving power
of L.H. wheel is boosted.
The result of this, the yaw moment occures in a right
to the vehicle.
(2) R.H.CLUTCH OPERATE
In order to boost the driving power of R.H. wheel,when
R.H.clutch is operated, a part of the driving power of
L.H. wheel flows to the differential case, the driving power
of R.H. wheel is boosted.
The result of this, the yaw moment occures in a left to
the vehicle.
High
speed
side
Low
speed
side
Pushing
force
Driving
power
moves
Pushing
force
Acceleration
gear
Decelation
gear
L.H.
Clutch
R.H.
Clutch
Differential
case
L.H.clutch
Driving
power
(small)
Driving
power
(large)
Yaw
moment
Turning
direction
R.H.
clutch
Driving
power
(small)
Driving
power
(large)
Yaw
moment
Turning
direction
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