303b Flashcards
The 3 V’s of energy transfer?
Volume
Velocity
Viscosity
What is an impeller?
Impeller receives torque from the engine flywheel and delivers oil to the turbine
Advantages of fluid couplers?
No mechanical connection
Shock absorption
Gradual start up of load
Disadvantages of fluid couplers?
Efficiency is lost due to slippage.
What is vortex flow?
This occurs when the turbine is spinning at a lower rpm than the impeller. Accompanied by high heat, low output speed and high torque. Also called converter phase
What is rotary flow?
When the impeller and the turbine are spinning at the same speed, creating a coupling effect. Also known as coupling phase
What decides flow in a torque converter?
The transmissions resistance to flow
What is the purpose of a split guide ring?
Prevent turbulence within the unit while it is in operation
The impeller is sometimes called?
Pump
What’s the turbine?
Converts the kinetic energy in the fluid into mechanical energy. The mechanical energy is transmitted to the driveline
What’s the stator?
Also called the reaction member, is designed to change the direction of the oil flow so that it assists in torque multiplication
What are the two types of stators?
Fixed
Freewheeling
What are lockup clutch’s?
The lockup clutch mechanically connects the turbine and the impeller giving a true 1:1
What are phases?
Phases refer to the relationship between the impeller and turbine relative to energy transfer.
Converter, coupling, lockup
What are stages?
Stage refers to the number of times the oil strikes the turbine before it returns to the impeller
Variable capacity torque converters
Multi impeller
Multi turbine
Variable pitch stator
Multi impeller converters?
Both impellers locked together for high torque and one released and free wheels for light work
Multi turbine?
Use two turbines that are connected together by an overrunning clutch
Where does oil go directly after the torque converter?
Oil cooler
What is the purpose of an outlet relief?
Keeps the converter full of oil
Dry housing characteristics?
No pto, torque converter is sealed so no oil leaks into the housing
Wet type converter?
Uses oil to line gear train in housing for a pto or scavenge pump.
Scavenge methods?
Gravity drain
Scavenging pump
Functions of a torque divider?
Provide automatic clutching
Multiply engine torque
Absorb power train shock loads
The prime mover in a torque divider is connected to what?
Sun gear
Output shaft in a torque divider is connected to what?
Planetary carrier
Converter mounting options?
Engine mount
Remote mount
When are stall tests generally conducted?
Highest gear
What could be happening with a slipping 1 way clutch on a stator?
Low stall speed
What must you check after installing a torque divider/converter?
Crankshaft endplay
