EXPERIMENT No.9


EXPERIMENT No.9
08:  A Observations:
Clutch components and their functions
Sr
no
Part Name
Function of part
1
Clutch Plate
To connect driving and driven shafts and thereby transmitting power.
2
Pressure plate
To exert pressure and to grip the clutch plate between flywheel
 And pressure plate.
3
Spring
The plates are alternately fitted to the engine shaft and gear box shaft.
They are firmly pressed by strong coil springs and assembled in a drum
4
Driven shaft
To transmit the motion to the wheel
5
Driving shaft
To transmit motion from an engine shaft to flywheel and then to rear wheel
8.0:  B
    
                        



                                                Drive plate                            Driven plate
9.0 Student related activity: Centrifugal clutch consists of  a number of shoes on the inside of the rim of the pulley. The outer surface of the shoes are covered with friction material. These shoes which can move radially in guides are held against the boss or spider on the driving shaft by means of springs. The springs exert radially inward  constant force. The mass of the shoes when revolving will exert  a radially outward force. When the centrifugal force exceeds the spring force the shoe moves outward and come into contact with the driven member and presses against it. The increase of speed causes the shoe to press harder and enables more torque to be transmitted.
10.0 Questions for confirmation for learning:
1. Single plate clutch , multiplate clutch, centrifugal clutch.
2. The force of friction is used to start the driven shaft from rest and gradually brings it up to the proper speed without excessive slipping of the friction surface.
3.  asbestos, compound organic resin with copper wire, ceramic material.
4. Spanner set, Screwdriver set.



11.0      Conclusion / Results :
1. Wet                       2. driving                     3. driving                    4. disengaged
5. The friction clutch has it’s principal application in the transmission of power of shafts and machines which must be started and stopped frequently. It’s application is also found in cases in which power is to be delivered to machines partially or fully loaded and placed between crankshaft and transmission arrangement.
12.0 Questions :
1. The clutch is used to connect an engine to the driven shaft with the help of friction  
    plates.       
2. Friction lining is done on clutch plate. When coming in contact with flywheel, it
    transmits    motion to the wheel or driven shaft
3. Common materials used in friction lining – matrix of asbestos, fiber and starch, woven  
    Type facing material, leather, cork, fabric, Reybestos  and ferodo.
4. Non co-axial shafts cannot be connected by clutch; if joined –velocity ratio is very  
    low, so of no use.            
5. When clutch is immersed in an oil it is called as wet clutch 
6. Plates move apart as pressure is removed, friction between plates is lost and driving  
    Plates rotate relative to driven plate. Driving and driven shafts are separated and  
    power is not transmitted. 
7. When clutch pedal is depressed through a pedal movement, the ‘clutch release  
    bearing’ presses on the clutch release lever plate, which being connected to the  
    clutch release levers, forces these levers forward. This causes the pressure plate to  
    compress the pressure springs, thus allowing it to move away from the clutch driven
    plate. This action releases the pressure on the driven plate and flywheel. The
    flywheel is now free to turn independently, without turning the transmission.
8. Heat dissipation and lubrication are the important purposes served by the use of oil in  
    wet clutches.
9. If maximum transmission efficiency is achieved by applying smaller but high co-
    efficient of friction with friction plates then size of the clutch can be reduced.
10. Without clutch, running of the vehicle will produce sudden jerks while starting and  
      stopping the vehicle besides problems in gear shifting.
11. The efficiency of single plate clutch is less and wearing of friction plates and  
       pressure plates may cause often repair and maintenance of the vehicle.
12. Slip – oil or grease on the driven plate facing.  – fit new plate and eliminate oil leak.
      Abnormal facing wear – overloading  and resultant excessive slippage while  
      starting. – avoiding overloading and excessive slippage.               


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