1990 MITSUBISHI ECLIPSE clutch

-.AUTOMATIC TRANSAXLE
- Transaxle Mechanism21-25
-FRONT CLUTCH
Clutch plate,
Check valve
Piston -Front clutch retainer
-
D-nng
XHydraulicpressure
-Snap ring
.
‘Snap ring(Selection)1750213Front
ClUtCh IS ot tne multtple alsc n/pe, ana IScomposed of a front clutch retainer, discs, plates,
and a piston. The front clutch is actuated when the‘3 is in forward third or back gear. It conveys
&..rving force of the input shaft to the reverse sun
gear.1 I.D.mm (in.)I66 (2.60)I
POWER FLOW
Rear clutch retainerFront clutch,
\
Klckdown drumReverse sun gear/
IInput shaftRear clutch retainerReverse sun gear

21-26AUTOMATIC TRANSAXLE - Transaxle Mechanism
REAR CLUTCH
Wave sprmgRear clutch retainer
Clutch reaction piateClutch pressure plate
I1rao2l5Rear clutch is of the multiple disc type, and is
composed of a rear clutch retainer, disc, plates, and
a piston. When the piston is actuated by the oil
pressure, the multiple disc clutch is connected,
conveying driving force from the input shaft to the
forward sun gear in the planetary gear set. The rear
clutch is always actuated when the shift is in first,
second and third gears.
INumber of clutch discsI.3I
1 Number of clutch piates1 2 I-
I Number of reaction plates
I
1 1
I Number of pressure plates’I 1 I
PistonO.D.mm (in.)121 (4.761
I.D.mm (in.)36 (1.42)
POWER FLOW
Rear clutch
Rear clutch hubRear clutch retainer
Forward sun gear,
IInput shaftRear clutch retainerRear clutchRear clutch hubForward sun gear

AUTOMATIC TRANSAXLE - Transaxle Mechanism21-27
/clutch plate-Piston
End clutchretainer
(“7Hydraulic
pressure
POWER FLOWEND CLUTCH
End clutch is of the multiple disc type and is installed at the rear
end of the input shaft. The clutch is actuated in the fourth gear
(overdrive) to transmit the power from the input shaft to the
planetary gear carrier.
Actually. the end clutch also operates during third gear, and thisis to maintain smooth up-shifting to fourth gear.
Number of clutch discs3Number of clutch plates
3Number of reaction plates
1
PistonO.D.mm (in.)124 (4.88)I
I.D.mm (in.)29 (1.14)J
End clutchEnd clutch
IInput shaftEnd clutch retainerEnd clutch shaft
Carrier
a

iAUTOMATIC TRANSAXLE
- Transaxle Mechanism
ONE-WAY CLUTCH
I
’
21-31
Long pinion(Planetary gear carrier)
CarrierInput
output
Held
stationary
sun gear
170207170320One-way clutch is of the sprag type and is
incorpo-rated between the pinion carrier and the center
support.
In
1st gear (D or 2 range), the long pinion rotates
clockwise as viewed in’the direction of arrow P. This
produces a force which has the tendency to cause
the carrier to rotate counterclockwise, but the
carrier is blocked from rotating in that direction by
the one-way clutch. As a result. the long pinion
transmits its force to the
annulus gear.
The carrier, which is coupled with the one-wayclutch outer race, is free to turn in clockwise
direction. In an engine braking condition under
which the
annulus gear is turned first. the carrier
turns clockwise freely and, therefore, the engine
braking effect is not obtained.
INumber of sprags26
Width of clutchmm (in.)18.3 (720)HOLDING CARRIER WITH ONE-WAY CLUTCH
P 0
On-y clutchI
\Carrierl7so223

21-32AUTOMATIC TRANSAXLE - Transaxle Mechanism
PLANETARY GEAR
-.., ‘~ ~,.~.“.,
Reverse sun gear\ParkIng sprag
Carrier\
I\
i
\
Outer race.-End clutch shaftLow/reverse brake’s hub
Short pmlon17502L
The planetary gear set incorporated in
thus transaxle
is of the Ravigne’aux-type, and consists of a forward
sun gear, a reverse sun gear, a short prnion. a long
pinion, a carrier to support both pinions, and an
annulus gear.
The reverse sun gear is connected to the front
clutch retainer via the
kickdown drum, while the
forward sun gear is connected to the rear
clutchhub.
The carrier is built in one unit with the low reverse
brake’s hub and the outer race of the one-way
clutch. The carrier is connected to the end clutch via
the end clutch shaft.
The
annulus gear, to which the output flange isconnected, conveys driving force to the transfer
drive gear installed on the output flange. And the
parking sprag is provided on the outer circumfer-
ence of the
annulus gear.
Number of forward sun gear teeth
Number of reverse sun gear teeth
2634
INumber of short pinron teethI22 1Number of long pinion -teeth
Number of
annulus gear teeth74 1c-’

AUTOMATIC TRANSAXLE - Transaxle Mechanism21-33
POWER FLOW
T GEAR (“D” and ‘2” ranges)
Short
DinionCarrier
IForward sun gear
IOne-way clutch
IAnn&s gear
Rear clutch
-1Long pinioniransfer
drive gear
, Idler gear
Transfer* driven gear
17!50057
rear clutch is actuated when the shift is in 1 st gear in the
“D”. “2” or “L” range, driving force is transmitted to the forward sun
gear which rotates in the clockwise direction.
ITherefore, torque is conveyed from the forward sun gear through the
short pinion (counterclockwise) and the long pinion (clockwise) to theannulus gear (clockwise) to achieve the reduction ratio of 1 st gear.
Since the long pinion’s shaft (that is, the carrier) tries to turn
/counterclockwise at this time, the one-way clutch prevents this to
provide for a sufficient amount of driving force to be transmitted to
.
the annulus gear.
,
This means that, because the carrier can turn clockwise, engine brakedoes not function when the shift is in
1 st gear in the “D” or the “2”
range.

_____--._- .21-34AUTOMATIC TRANSAXLE
- Transaxde Mechanism
1ST GEAR (“L” range)
Low/Reverse brake
Carrier
IShort pinion
I
Forward sungearAnnulus gear
ODeratina elements:&ear clkch. .--. _.-__.I*Low-Reverse brake
1
I>\\PRear clutchLong pinion
1750058When the shift is in
1st gear in the “L” range, the low reverse brake is
actuated to fasten the planetan/ gear carrier, so that the gear does not
turn in either direction.
.
This means that engine brake works when the shift is in 1 st gear inthe “L” range.
cNOTEThe power flow in
1 st gear in the “L” range is the same as it is in 1 st gear
in the “D” and “2” ranges.

2ND’ GEARAUTOMATIC
TRANSAXLE - Transaxle Mechanism21-35
Kickdown brake
I
Shon pinion
\Forward sun gear
1.//LT.//. , ,’ .‘,,i.:,;:.:‘.,.‘,\/
/
Annulus gearLong pinion
Rear clutch/Reverse sun gear
fharatinn damants:
-, IWI WUIUI IWickdown brakeI
.
c
Since the rear clutch and the kickdown brake are actuated when theshift is in
2nd gear in the “0” or the “2” range, driving force is
transmitted to the forward sun gear which rotates in the clockwise
direction,
Therefore, torque is conveyed from the forward sun gear through the
short and long pinions to the annulus gear, as in the case of 1 st gear.
--However, since the reverse sun gear is fastened by in the case of
2ndgear, the long pinion“walks” on the reverse sun gear in the direction
of arrow (A), causing the annulus gear to rotate faster (or more) than
in the case of 1 st
gear in proportion to the length that the long pinionhas “walked”.
The reduction ratio of
2nd gear is achieved in this way.
---