Chrysler PT Cruiser. Manual — part 834
IMPELLER
The impeller (Fig. 348) is an integral part of the
converter housing. The impeller consists of curved
blades placed radially along the inside of the housing
on the transmission side of the converter. As the con-
verter housing is rotated by the engine, so is the
impeller, because they are one and the same and are
the driving member of the system.
Fig. 348 Impeller
1 - ENGINE FLEXPLATE
4 - ENGINE ROTATION
2 - OIL FLOW FROM IMPELLER SECTION INTO TURBINE
SECTION
5 - ENGINE ROTATION
3 - IMPELLER VANES AND COVER ARE INTEGRAL
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40TE AUTOMATIC TRANSAXLE
PT
TORQUE CONVERTER (Continued)
TURBINE
The turbine (Fig. 349) is the output, or driven,
member of the converter. The turbine is mounted
within the housing opposite the impeller, but is not
attached to the housing. The input shaft is inserted
through the center of the impeller and splined into
the turbine. The design of the turbine is similar to
the impeller, except the blades of the turbine are
curved in the opposite direction.
Fig. 349 Turbine
1 - TURBINE VANE
2 - ENGINE ROTATION
3 - INPUT SHAFT
4 - PORTION OF TORQUE CONVERTER COVER
5 - ENGINE ROTATION
6 - OIL FLOW WITHIN TURBINE SECTION
PT
40TE AUTOMATIC TRANSAXLE
21 - 291
TORQUE CONVERTER (Continued)
STATOR
The stator assembly (Fig. 350) is mounted on a sta-
tionary shaft which is an integral part of the oil
pump. The stator is located between the impeller and
turbine within the torque converter case (Fig. 351).
The stator contains an over-running clutch, which
allows the stator to rotate only in a clockwise direc-
tion. When the stator is locked against the over-run-
ning clutch, the torque multiplication feature of the
torque converter is operational.
TORQUE CONVERTER CLUTCH (TCC)
The TCC (Fig. 352) 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 front cover to pro-
vide this mechanical lock-up.
Fig. 350 Stator Components
1 - CAM (OUTER RACE)
2 - ROLLER
3 - SPRING
4 - INNER RACE
Fig. 351 Stator Location
1 - STATOR
2 - IMPELLER
3 - FLUID FLOW
4 - TURBINE
Fig. 352 Torque Converter Clutch (TCC)
1 - IMPELLER FRONT COVER
2 - THRUST WASHER ASSEMBLY
3 - IMPELLER
4 - STATOR
5 - TURBINE
6 - PISTON
7 - FRICTION DISC
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40TE AUTOMATIC TRANSAXLE
PT
TORQUE CONVERTER (Continued)
OPERATION
The converter impeller (Fig. 353) (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.
Fig. 353 Torque Converter Fluid Operation
1 - APPLY PRESSURE
3 - RELEASE PRESSURE
2 - THE PISTON MOVES SLIGHTLY FORWARD
4 - THE PISTON MOVES SLIGHTLY REARWARD
PT
40TE AUTOMATIC TRANSAXLE
21 - 293
TORQUE CONVERTER (Continued)
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