190303b Flashcards
Identify the two major functions of a torque converter
A) torque multiplication
B) Fluid Coupling (engagement device)
Identify 2 torque converter features that help protect the driveline and or Transmission
A) shock absorption during engagement reduces powertrain stresses
B) gradual start up for load reduces stresses on The driveline and or Transmission
Identify the two types of oil flow And the conditions under which each occurs
A) vortex flow occurs when difference in the impeller and turbine speed is greatest
B) Rotary flow occurs When the difference in impeller and turbine speed is slight (direct Drive)
Vortex flow is the greatest when:
Torque output is the greatest
Rotary flow in a hydrodynamic drive is
Greatest when torque output is the lowest
Identify the 3 main torque converter elements
A) impeller or Pump (Drive unit)
B) stator
C) turbine ( driven unit )
The purpose of the stator is to:
Change direction of oil flow
The part is connected to the transmission input shaft is the ?
Turbine
Is a lockup clutch engaged at low engine RPM to prevent torque converter slippage during those periods when high torque output is required? T/F
False
The purpose of a torque converter lockup clutch is
To increase efficiency
The clutch disc of a torque converter lockup clutch is connected to
The impeller and turbine
The term phase refers to
3 phases of a torque converter
converter
coupling
lockup
Maximum torque converter output torque occurs when
The turbine is stopped and the impeller is turning at maximum possible rpm
The stator is a
Stationary reactor
Converter temperature sending units are usually located in
The converter oil output
The highest torque output is produced in the variable vane stator when the vanes are in what position?
The open position
When the torque demand is low what position are the vanes of a variable vane stator in?
Vanes are in the “closed” position
List the features of the transmission reservoir
Stores oil
Cools oil
Settles out contamination
De-aerates
Outlet torque converter oil always goes where?
To the cooler
The hottest oil in the powertrain circuit is where?
Torque converter outlet
What does the torque converter pressure regulating valve do?
Ensures torque is full of oil
Maintains working pressure within the torque converter
Prevents cavitation and aeration
What did early torque converters use as a fluid?
Diesel fuel
Powertrain oils lubricating properties are affected at which temperature?
121C 250F
Breakdown temp
If a PTO or any type of drive gears are used what type of housing will you have?
Wet housing
Which type of housing is usually used on industrial applications when PTO gears are mounted in the converter housing?
Wet housing
What are five things you can check the torque converter for when it’s removed
Missing balance weights, cracks, broken welds, broken drive lugs, score marks and a pressure test
When pressurizing a torque converter to check for leaks what’s the rule of thumb regarding pressure to test with
Apply 50% more then operating pressure. Example. 50 PSI is operating +50% equals 75 PSI
When cleaning components of a torque converter what is a major precaution
That aluminum components will not be damaged by the cleaning solution
What is a critical step when assembling a torque converter for install
Pre-lubrication during assembly stage is critical to ease proper assembly and provide adequate lubrication at start up
If shift linkages have been removed, what must be done after install?
Ensure proper adjustment if required so the detents at the transmission shift control are in the proper detent when the shift control is in neutral or any selected position
When is a gravity drain used?
When the torque converter housing is located above the transmission
What are the three functions of a torque divider?
Provides automatic clutching, multiplies torque and absorbs power train shock loads
Which planetary gear set component is the impeller splined to in a torque divider?
The sun gear
Which component is the internal gear splined to in a torque divider?
The turbine
Which component is the output shaft splined to in a torque divider?
The carrier/planetary
In a torque divider, oil flow for torque converter operation and component lubrication comes from where?
An engine driven charging pump
What type of converter housing does a torque divider have?
Wet type with scavenge
Torque converters may be installed in the power train in what two locations?
- Engine mounted, sometimes called integral design
- Remote mounted
What is a critical concern in a remote mounted torque converter application?
Proper driveline alignment
A torque divider must be pressure lubed.. why
It is above its oil level. it does not sit in oil. scavenge oil out
