09-11-2016, 04:13 PM
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Lesson Objectives
1. Describe the function of the torque converter.
2. Identify the three major components of the torque converter that
contribute to the multiplication of torque.
3. Describe the operation of each major torque converter component.
4. Describe the operation of the lock−up mechanism of the torque
converter.
5. Identify the three major components of the simple planetary gear set.
6. Describe the function of the simple planetary gear set to provide
speed change, torque change and directional change.
7. Describe the operation of multi−plate clutches, brake bands and
one−way clutches.
8. Describe the effect of centrifugal fluid pressure on the operation of
a multi−plate clutch.
9. Given a clutch application chart and planetary gear model:
a. identify which holding devices are applied for each gear range.
b. identify the planetary gear components held for each gear range.
c. use a process of elimination to determine the proper function of
holding devices by testing it’s operation in another gear range.
d. use parallel holding devices to narrow diagnosis to faulty clutch
or brake.
10. Describe the difference between overdrive operation in the front
wheel drive and rear wheel drive automatic transmissions.
The torque converter provides an automatic means of coupling engine
torque to the input shaft of the transmission. The torque converter’s three
major components are; the pump impeller, the turbine runner and the
stator. The hydraulic fluid in the converter transfers torque through the
kinetic energy of the transmission fluid as it is forced from the impeller to
the turbine. The faster the engine rotates, the greater the torque applied
to the turbine. At low engine speeds, the turbine can be held stationary as
the force of the fluid’s kinetic energy is not great enough to overcome the
holding force of the light brake system application.