Torque Converter Fundamentals and Service Flashcards Preview

Off-Road Powertrain > Torque Converter Fundamentals and Service > Flashcards

Flashcards in Torque Converter Fundamentals and Service Deck (24):
1

What are the 2 major functions of a torque converter

Torque multiplication
Fluid coupling

2

Hydrostatics

Using fluids under pressure to achieve drive

3

Hydrodynamics

Energy transfer through fluid motion
Commonly called fluid couplings

4

Impeller

Also called pump
Is the drive portion of a TC

5

Turbine

Output element
In normal TC connected to output shaft

6

What 2 TC features help protect the driveline or trans

Shock absorption
Gradual start up of load

7

Vortex flow

When oil is flowing back and fourth between impeller and turbine
Turbine is spinning slower
Creates high torque
Called converter phase

8

Rotary flow

Occurs when oil flows same direction as impeller
Turbine and impeller spin about same speed
Lower torque
Called coupling phase

9

Split guide ring

Prevent turbulence and helps direct vortex flow

10

What are the 3 major components of a TC

Impeller
Turbine
Stator

11

TC stator

Changes the direction of the oil coming back from turbine so that instead of it slowing impeller it come into impeller with momentum

12

Stator can increase torque by how much

By a 2.00:1 to 3.00:1 ratio

13

What are the 2 styles of stators

Fixed
Freewheeling

14

Fixed type stator

Is attached to the converter housing stub shaft
Can never achieve rotary flow
Will be a single phase converter

15

Freewheeling stator

Has an overrunning clutch
Used in a 2 or more phase converter
Will lock up when turbine speed is less then speed of impeller

16

TC stage

Refers to the number of times oil strikes a set of turbine blades before returning to impeller

17

Stall speed

When greatest speed difference between impeller and turbine is created, generates highest torque multiplication

18

What are the functions of a torque divider

Provide automatic clutching
Multiply engine torque
absorb powertrain shock loads

19

What type of stator is used in a torque divider

fixed

20

Stall speed

Occurs when the turbine is stopped and the impeller is turning at rated engine speed (in TD turbine is going in reverse)

21

High stall speed

Occurs when there is not enough load on engine
-Slipping clutch
-Cavitation in converter`

22

Low stall speed

Engine speed is lower than specified
-Slipping stator

23

The purpose of the stator is

Change direction of oil flow

24

The purpose of the TC lock up clutch is

To increase efficiency