This document discusses different types of clutches used in automobile engineering. It begins by defining a clutch as a machine component that allows a driving shaft to connect to or disconnect from a driven shaft. There are several requirements for a good clutch, including torque transmission, gradual engagement, heat dissipation, and compact size. The document then outlines and describes various clutch types, including friction clutches, dog clutches, cone clutches, overrunning clutches, safety clutches, centrifugal clutches, hydraulic clutches, and electromagnetic clutches. It focuses on friction clutches, explaining their operation and providing examples like single plate and multi-plate configurations commonly found in automobiles.

1. MEE 7101
AUTOMOBILE ENGINEERING
Prepared by: Deepak Sharma (Asst. Prof.)
Department of Mechanical Engineering
IET, GLA University Mathura
Lecture: 4
CLUTCH & THEIR TYPES

2. Clutch
1. A Clutch is a machine member used to
connect the driving shaft to a driven shaft, so
that the driven shaft may be started or stopped
at will, without stopping the driving shaft.
2. A clutch thus provides an interruptible
connection between two rotating shafts.
Clutches allow a high inertia load to be stated
with a small power.

3. Requirements Of Good Clutch
1. Torque Transmission
2. Gradual Engagement
3. Good Heat Dissipation
4. Compact Size
5. Sufficient Clutch Pedal Free Play
6. Ease of Operation

4. Different Types Of Clutches
1. Friction Clutch
2. Dog Clutch
3. Cone Cutch
4. Overrunning Clutch
5. Safety Clutch
6. Centrifugal clutch
7. Hydraulic Clutch
8. Electromagnetic Clutch

5. Friction Clutch
1. A friction clutch transmits power by virtue of
friction developed between contacting surface.
2. The friction surface is typically flat and
perpendicular to the axis of rotation. Two or
more surface is pressed together by using
compression spring.
3. The friction force is used to bring the driven
shaft to the proper speed gradually without
excessive slipping.

6. Advantages of friction clutch
1. Smooth engagement and minimum shock during the
engagement.
2. Friction clutch can be engaged and disengaged when
the machine is running since they have no jaw or
teeth.
3. Easy to operate.
4. They are capable of transmitting partial power.
5. Friction clutch can act as a safety device. They slip
when the torque exceeds a safe value, thus safeguards
the machine.
6. Frequent engagement and disengagement is possible.

7. Application of friction clutch
1. Friction clutch found an application where
frequent engagement and disengagement is
required.
2. It is also used where power is needed to
transfer to the machines partially or fully
loaded.
3. It’s typical application is in automobiles.

8. Requirement of good friction clutch
1. The following are considered during the design of the
friction clutch.
2. The coefficient of friction of contact surface should be
high enough to hold the load with a minimum amount of
axial force. It should not require an external force to carry
the burden.
3. The moving parts of the clutch should be lightweight to
minimize the inertia load at high speed.
4. Heat generated at contacting surface should dissipate
rapidly.
5. It should have provision for taking up the wear of contact.
6. Guard the projecting parts by covering and provide a
provision for easy repair

9. Requirements of material used for
friction clutch
1. It should have a relatively high and uniform
coefficient of friction under all service conditions.
2. High resistance to wear.
3. It should withstand a high compressive load.
4. It should be chemically inert, oil and moisture have no
effect on them.
5. High heat conductivity. It should rapidly dissipate the
heat generated.
6. It should have excellent compactibility with cast iron
facing.

10. Types of Friction Clutches
1. Disc or plate clutches
2. Cone clutches
3. Centrifugal clutches

12. T
T
W (axial thrust)W
Friction
plate
Friction
liningPressure
plates
springs
Single-plate Friction Clutch (Disengaged position)
Driving
shaft
Driven
shaft
Flat-plate friction clutches

13. Single-plate Friction Clutch (Engaged position)
T
T
W (axial
thrust)
W
Friction plate
Friction
lining
Pressure
plates
springs
Driving
shaft
Driven
shaft
Flat-plate friction clutches

14. An example is the clutch found in most
automobiles.
Flat-plate friction clutches

16. Animation of Single Plate Clutch

18. Torsional
springs
Splined boss
(hub)
Friction
lining
Clutch plate or friction plate

19. Pressure
plate
Diaphragm
spring
Clutch
housing
Pressure plate and housing

21. In a multi plate clutch, the torque is
transmitted by friction between several pairs
of co-axial annular driving faces maintained
in contact by an axial thrust.
Both sides of each plate are lined with friction
material, so that a single-plate clutch has two
pairs of driving faces in contact.
Multi plate clutches

22. n = no. of pairs of driving faces.
Then, for a plate clutch, the maximum
torque transmitted is
Multi plate clutches

23. No. of driving
pairs n = 6
driver driven
Pressure plates
Friction plates
21 43 65
Multi plate clutch