Jeep cherokee 2000 Service Manual page 1133

XJ
DESCRIPTION AND OPERATION (Continued)
STATOR
The stator assembly (Fig. 8) is mounted on a sta-
tionary shaft which is an integral part of the oil
pump. The stator also contains an over–running
clutch. The stator is located between the impeller
and turbine within the torque converter case (Fig. 9).
The over–running clutch of the stator allows the sta-
tor to rotate only in a clockwise direction.
Fig. 8 Stator Components
1 – CAM (OUTER RACE)
2 – ROLLER
3 – SPRING
4 – INNER RACE
TORQUE CONVERTER CLUTCH (TCC)
The TCC (Fig. 10) was installed to improve the
efficiency of the torque converter that is lost to the
slippage of the fluid coupling. Although the fluid cou-
pling provides smooth, shock–free power transfer, it
is natural for all fluid couplings to slip. If the impel-
ler and turbine were mechanically locked together, a
zero slippage condition could be obtained. A hydraulic
piston was added to the turbine, and a friction mate-
rial was added to the inside of the impeller housing
to provide this mechanical lock-up.
OPERATION
The converter impeller (Fig. 11) (driving member),
which is integral to the converter housing and bolted
to the engine drive plate, rotates at engine speed.
The converter turbine (driven member), which reacts
from fluid pressure generated by the impeller, rotates
and turns the transmission input shaft.
TURBINE
As the fluid that was put into motion by the impel-
ler blades strikes the blades of the turbine, some of
the energy and rotational force is transferred into the
turbine and the input shaft. This causes both of them
AW–4 AUTOMATIC TRANSMISSION
Fig. 9 Stator Location
1 – STATOR
2 – IMPELLER
3 – FLUID FLOW
4 – TURBINE
Fig. 10 Torque Converter Clutch (TCC)
1 – IMPELLER FRONT COVER
2 – THRUST WASHER ASSEMBLY
3 – IMPELLER
4 – STATOR
5 – TURBINE
6 – FRICTION DISC
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