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Construction Mechanic Basic Volume 02 - Construction methods and practices | Next
Figure 4-25.—Torque converter in fluid coupling stage. |
Input shaft—transfers power from the torque
converter to internal drive members and
gearsets.
Oil pump—produces pressure to operate
hydraulic components in the transmission.
Valve body—operated by shift lever and
sensors; controls oil flow to pistons and servos.
Pistons and servos—actuates the bands and
clutches.
Bands and clutches—applies clamping or
driving pressure on different parts of gearsets to
operate them.
Planetary gears—provides different gear ratios
and reverse gear.
Output shaft—transfers engine torque from the
gearsets to the drive shaft and rear wheels.
TORQUE CONVERTERS
The torque converter is a fluid clutch that performs
the same basic function as a manual transmission dry
friction clutch (fig. 4-24). It provides a means of
uncoupling the engine for stopping the vehicle in gear.
It also provides a means of coupling the engine for
acceleration.
A torque converter has four basic parts:
1.
2.
3.
Outer housing—normally made of two pieces of
steel welded together in a doughnut shape,
housing the impeller, stator, and turbine. The
housing is filled with transmission fluid.
Impeller—driving member that produces oil
movement inside the converter whenever the
engine is running. The impeller is also called the
converter pump.
Turbine—a driven fan splined to the input shaft
of the automatic transmission. Placed in front of
Figure 4-24.—Torque converter, partial cutaway view.
4-27
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