Failure of clutch plate

Failure of clutch plate

Prepared by.Arshad Abbas KhanWah Engineering college wah cantt

TITLE

• A clutch is really a machine that gives for your transmission of energy (and thus generally movement) from 1 element (the driving member) to a different (the pushed member) when engaged, but may be disengaged.

What is clutch

Clutch

– Flywheel– Clutch disc– Pressure plate

COMPONENTS OF CLUTCH

• ELECTROMAGNETIC CLUTCH• HYDRAULIC CLUTCH• CENTRIFUGAL CLUTCH• SAFETY clutch• OVERRUNNING CLUTCH• CONE CUTCH• DOG CLUTCH• FRICTION CLUTCH

Types of clutch according to applications

clutch release mechanism

mostly two types of release mechanism are used1.Cable operated release 2.hydraulic release

Clutch plate • A most important component in clutch is

clutch plate or clutch disc

1.Wet clutch plateWet clutch are universal and found on any bike. Almost

99% of motorcycle manufactured uses this kind of clutch. Here it is bathed in oil It stops the clutch from knocking on itself.

2.Dry clutch plateThere is no oil circulated in to the clutch, which result

into clutch knocking on itself. These types of clutch are used in cars and heavy vehicles

TYPES OF CLUTCH PLATES

The springs are most important in c.plate the sudden shocks or jerks on the plates are observed by the springs.torsional springs can be spring or rubber

What is the purpose of springs in plate?

1. Incorrect gear selection Incorrect gear selection of a low gear while driving at speed

causes the driven plate to accelerate instantaneously to a speed far in excess of the facing burst strength due to the multiplication of the rotation speeds of the Gearbox and or Differential Ratios.

2. Miss-Shifting a gear Miss-Shifting a gear while driving at speed can also cause

the plate to accelerate past its facing burst strength. Miss-Shifting a gear at high engine RPM can also cause the facing material to break away from the Backing plate or damage the clutch hub the stop pins-and blow out the compression springs causing compete clutch disc failure.

Cause of failure of clutch plate

3. Excessive clutch slippage Excessive clutch slippage while driving causes the facing

materials to overheat resulting in disintegration and failure of Clutch Disc and Pressure plate assemblies due to contamination from the facing materials.

4.No proper care during installationSimply dropping a clutch disc on the floor or during

installation can impact and easily crack the facing material after a short operational period.

Cause of failure of clutch plate

Consider two friction surfaces maintained in contact by an axial thrust (W) as shown in fig(a)

Calculation of frictional torque

Calculation of frictional torque

Calculation of frictional torque

When we consider uniform pressure When the pressure is uniformly distributed over the entirearea of the friction face as shown in Fig.(a) then the intensity of pressure,

Calculation of frictional torque

Thanks