torque converter

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GP COMD IP

TORQUE CONVERTER

I RODUCT I O N TN

In 1910 George Constantinesco invented torque

converter

He was a british auto mech engr

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AIM

To acquaint the student offrs with

the mech, working and latest trends

of a torque converter

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SEQ

Stage – I Def of terms Objs Loc Principles of Fluid

Stage – II Parts Op phases Actions

Stage – III Advs and Disadvs of Torque Converter

Stage – IV Latest Trends Defects Care and Maint

Concl

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STAGE - I

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DEF OF TERMS

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o Hydrodynamic

It is a branch of theoretical Fluid dynamics

which deals with flow of an ideal fluid. A device

using fluid as principle of its func is called

hydrodynamic device

o Fluid Coupling

A fluid coupling is a hydrodynamic device used

to transmit rotating mech power. It has been

used in auto tx as an altn to a mech clutch

o Torque Converter

A device which tfrs the torque of the engine to

the tx gradually, using a fluid. A torque

converter is a modified form of a fluid coupling,

and unlike fluid coupling , is able to multiply

torque

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OBJS

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To multiply the engine torque at low RPM

To lock up at high speed

To inc and dec the engine torque according to

speed

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LOC

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Loc b/w engine and tx

Torque converter

TxEngine

Rotary motion

Vortex flow

Non- Compressibility

Equal Distr of Pressure

PRINCIPLES OF LIQUIDS

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STAGE - II

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PARTS

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Turbine

Casing

Pump

Stator

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OP PHASES

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Stall

Acceleration

Coupling

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ACTIONS

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Drive

Action TURBINE

STATOR

PUMP

ENGINE

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ACTIONS

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Torque Multiplication

Action Pump

Turbine

1ST Multipication

2nd Multipication

3rd Multipication

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ACTIONS

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Torque Multiplication

Action Torque converterActions

Pump Stator Turbine

1st torque multiplication

Oil leaves the outer vanes of the pump

- Hits the turbine giving it a push

2nd torque multiplication - -

Pushing the turbine and tending it to mov in the same dir of pump

3rd torque multiplication

Oil after leaving the stator enters the pump give it a further push

Oil enters pri stator and then sec stator

Oil leaves the inner vanes of the turbine

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ACTIONS

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Lock up

Action

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STAGE – III

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ADVS AND DISADVS

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Advs

o It needs no linkages

o It engages power train smoothly

oActs as a safety device

oReduces vibration

oReq less maint

Disadvs

o It can cause heating up of engine at low speed

oMore fuel consumption

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STAGE - IV

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LATEST TRENDS

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LATEST TRENDS

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Variable Pitch Stator

o In most cases the stator blades are ‘fixed’ at a predetermined angle

o In special designs of modern vehs variable pitch stator assy is used. For normal op in drive range, the stator blades are auto set at a low angle

o For inc acceleration greater torque is obtained by setting stator blades at high angle

Multiple Sec Members

o These torque converters have more sec members

o For example, five unit torque converter with pump, turbine, stator, lockup clutch and sec pump

o Purpose is to avoid slippage at high speeds

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DEFECTS

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Overheating - Caused due to low lvl

of oil

Slippage - Caused due to

overheated oil

Shudder - Symptom of

overheating oil

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CARE AND MAINT

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Use correct grade of oil

Oil lvl should be checked frequently

Never park veh in gear

CONCL

Q & A

THANK YOU