Automobile Clutch: Definition, principle, Function, Types, Working [with pdf]

What is automobile clutch

  • Automobile clutch is device used to Engage & Disengage Power Transmission from Driver Shaft ( Engine Shaft ) to Driven shaft ( Gearbox shaft ) with the help of Clutch pedal.
  • It is located between the Engine & Gearbox as shown in below figure.
Automobile Clutch
Automobile-Clutch
  • When Automobile Clutch Engages, the power gets transmit from Engine to Gearbox .
  • When Clutch disengages the power not transmits from Engine to Gearbox.
  • In Easy language :- When Vehicle Running = Clutch is in engaged condition = Power is transmitting from Engine to Gearbox.
  • When Driver press Clutch pedal for Gear shifting or to slow down vehicle = Clutch is in Disengaged condition = Power is not transmitting from Engine to Gearbox.

Function of clutch

The clutch is important part of vehicle which has following functions :-

  • To smoothly transmit power from engine to gearbox when vehicle is running.
  • To shifting up or shifting down the gears without damaging gearbox when vehicle is running or stationary.
  • To engage or disengage the power transmission from engine to gearbox as per requirement.
  • At the time of emergency braking, clutch is necessary to sudden slow down vehicle.

Working principle of clutch

Automobile Clutch
Automobile-clutch-working-principle
  1. Automobile clutch works on principle of Friction.
  2. Friction is responsible for the power (torque) transmission from Flywheel to Gearbox.
  3. Friction plate has friction surface on both side as well as pressure plate has friction surface on one side. Hence during running condition of vehicle, pressure plate presses the friction plate against flywheel. Hence due to friction between them, power transmits from engine to gearbox.

Construction of automobile clutch

Clutch is consists of the following components :-

  1. Flywheel
  2. Friction plate
  3. Pressure plate
  4. Release bearing
  5. Release fork
  6. Diaphragm (Spring)
automobile clutch
automobile-clutch-in-engage-position

1) Flywheel is connected to engine crankshaft hence rotates at speed receives from engine crankshaft.

2) A plate which having Friction lining on its both side surface is known as Friction Plate (shown in Figure) which is located between the flywheel and pressure plate. Friction Plate is pressed against Flywheel under axial force exerted by pressure plate.

3) The pressure plate has friction lining on one side ( Which comes in contact with friction plate ). Pressure plate is connected to the clutch pedal through a linkage. As per movement of clutch pedal, pressure plate apply or releases the pressure on friction plate.

4) In Engaged condition of clutch, flywheel, friction plate & pressure plate are united due to axial Force exerted by pressure Plate.

5) A power transmission by automobile clutch depends upon the following factors

  • Applied Pressure (F)
  • Coefficient of Friction ( μ )
  • Area of Friction Surfaces

6) The Power Transmission by automobile clutch is Expressed as ( T ) :- 

T = μ × F × R 

Where, 

  • μ= Coefficient of Friction
  • F= Pressure Applied on Friction Plate
  • R= Radius of Friction Surface

Hence Power Transmission by Automobile Clutch is depends upon the Pressure Exerted by Pressure Plate on Friction plate.

Working of clutch

DISENGAGEMENT :-

During vehicle is running, clutch is in engage position means pressure plate presses the friction plate on the flywheel. Hence due to friction between this plates, power transmits from engine to gearbox.

When driver press the clutch pedal to slow down vehicle or change the gear, pressure plate removes the pressure on friction plate. Hence friction plate moves backward from flywheel. Hence power transmission from engine to gearbox stops. hence in such way clutch disengages.

ENGAGEMENT :-

When driver release the clutch pedal, pressure plate again presses the friction plate on the flywheel. Hence due to friction between this plates, power again starts to transmits from engine to gearbox. hence in such way clutch engages.

Types of clutch

1) Friction Clutch

A) Cone Clutch
i) Internal Cone
ii) External Cone

B) Plate Clutch
i) Single Plate
ii) Multi Plate
a) Dry
b) Wet

C) Diaphragm Clutch
D) Centrifugal Clutch
E) Semi-centrifugal Clutch

2) Hydraulic Clutch
3) Vacuum Clutch
4) Electromagnetic Clutch

So, such types are comes under Automobile Clutch.

FAQ on clutch

  1. What is clutch?

    Automobile clutch is device used to Engage & Disengage Power Transmission from Driver Shaft ( Engine Shaft ) to Driven shaft ( Gearbox shaft ) with the help of Clutch pedal.

  2. Why is clutch important?

    Clutch is important 1) To smoothly transmit power from engine to gearbox when vehicle is running.
    2) To shifting up or shifting down the gears without damaging gearbox when vehicle is running or stationary.
    3) To engage or disengage the power transmission from engine to gearbox as per requirement.
    4) At the time of emergency braking, clutch is necessary to sudden slow down vehicle.

  3. What are the types of clutches?

    Types of clutches :- Friction clutches ( Single plate, Multiplate, Cone clutch, centrifugal clutch, Diaphragm clutch ), Hydraulic clutch, Vacuum clutch, Electromagnetic clutch.

  4. What does the clutch do in a car?

    1) Smoothly transmits power from engine to gearbox when vehicle is running. 2) Engage or disengage the power transmission from engine to gearbox as per requirement.

  5. Where is clutch in car?

    In car, clutch is located between the engine and gearbox.

  6. What is clutch and its types?

    Automobile clutch is device used to Engage & Disengage Power Transmission from Driver Shaft ( Engine Shaft ) to Driven shaft ( Gearbox shaft ) with the help of Clutch pedal.
    Types:- Friction clutches ( Single plate, Multiplate, Cone clutch, centrifugal clutch, Diaphragm clutch ), Hydraulic clutch, Vacuum clutch, Electromagnetic clutch.

  7. What is clutch and its function?

    Automobile clutch is device used to Engage & Disengage Power Transmission from Driver Shaft ( Engine Shaft ) to Driven shaft ( Gearbox shaft ) with the help of Clutch pedal.

    Functions:-
    1) To smoothly transmit power from engine to gearbox when vehicle is running.
    2) To shifting up or shifting down the gears without damaging gearbox when vehicle is running or stationary.
    3) To engage or disengage the power transmission from engine to gearbox as per requirement.
    4) At the time of emergency braking, clutch is necessary to sudden slow down vehicle.

  8. Where is the clutch located

    Clutch is located between the Vehicle’s engine and gearbox.

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