Elements Of Mechanical Engineering Disc Clutch

1. ELEMENTS OF MECHANICAL ENGINEERING
DISC CLUTCH
Made By – Neelkumar J Patel

2. INTRODUCTION
 A clutch is a machine member used to connect driving shaft to
a driven shaft so that the driven shaft may be started or
stopped at will , without stopping the driving shaft.
• The use of a clutch is mostly found in automobiles.
• A little consideration will show that in order to change gears or
to stop the vehicle, It is required that the driven shaft should
stop , but the engine should continue to run.
• It is , therefore , necessary that driven shaft should be
disengaged from the driving shaft.
• The engagement and disengagement of the shafts is obtained
by means of a clutch which is operated by a lever.

3. 3 KEY QUESTIONS HERE:
What Is The Purpose Of A Clutch?
1 To allow the driver to operate the engine in its
most efficient speed range - nominally 2000 - 3500
RPM, providing an operating speed range of
1500 RPM (Except when moving off from
standstill. During this transition mode the engine
must briefly operate outside of its designed speed
range.)
2 Allows driver to select a suitable gear ratio to
increase engine torque (torque multiplication) to
match an increased load requirement. (Change
down to a lower gear - a higher numerical gear
ratio.)

4. MAJOR TYPES OF CLUTCHES
What Are The Common Types Of Clutches?
MECHANICAL
ELECTRO-MAGNETIC
HYDRO-DYNAMIC

5. MAJOR TYPES OF CLUTCHES
What Materials Are Clutches Made Of?
• A coefficient of friction that remains stable with
temperature change
• Excellent thermal conductivity
• Good wear resistance
• Resistance to thermal fatigue
• Good high temperature strength
• A uniform coefficient of friction over the surface

6. This type comprises of dual or multi interfacing between a fibrous friction
material facing and a hard metal facing. Can be DRY interfacing or WET
interfacing.
Dry Plate Clutch
Wet Multi Plate Clutch
FRICTIONAL ENGAGEMENT
DISC/ PLATE CLUTCH

7. DRY DISC CLUTCH
BASIC ASSEMBLY COMPONENTS
 FLYWHEEL FACE
 CLUTCH DISC
 PRESSURE PLATE ASSEMBLY ( Clutch
Cover)
 CLUTCH RELEASE MECHANISM
 ( Release Bearing, Fork & Attachment,
Cable/Hydraulic Release, Pedal)

8. DRY DISC CLUTCH// CONTD..
FLYWHEEL
 MADE OF CAST IRON/
ALLOY METAL
 SURFACE CONDITION
 PILOT BEARING
 SINGLE / DUAL-MASS
FLYWHEELS, WHAT IS THE
DIFFERENCE?
 WHAT IS THE APPLICATION
OF DUAL-MASS
FLYWHEEL? WHAT
ADVANTAGE IT HAS
Single Mass Flywheel
Dual Mass Flywheel

9. DRY DISC CLUTCH//CONTD..
CLUTCH DISC
 ASSEMBLY OF METAL AND
COMPOSITE COMPONENTS HELD
TOGETHER BY RIVETS AND
DOWELS
 DESIGN FACTORS, LETS THINK OF
THEM AND DISCUSS!
 TORQUE TRANSMITTED
 SLIP AND WEAR RESISTANCE
 KINDNESS TO IRON SURFACES
 DISSIPATION OF HEAT
 EXPELTION OF SEPATATING
DEBRIS
 ROTATION DIRECTION
 TORSIONAL OSCILLATION
DAMPENING
 RIGIDITY
 SIMPLICITY OF REPAIR

10. DRY DISC CLUTCH//CONTD..
PRESSURE PLATE
ASSEMBLY
 CONFIGURATION
 SINGLE PLATE / DUAL OR
MULTI PLATE
 COIL SPRINGS /
DIAPHRAGM SPRING
 PUSH RELEASE / PULL
RELEASE
 MATERIALS USED?
 CAST IRON FOR PRESSURE
PLATES
 SPRING STEEL FOR
SPRINGS

11. DRY DISC CLUTCH//CONTD..
 Clutch Release Mechanisms:
 Can be cable/ rod mechanism.
 Can be hydro-mechanical,
employing master and slave
cylinders using brake fluid.
 Can be pneumatically operated,
like in commercial vehicles
transmissions.

12. SINGLE DISC CLUTCH

13.  Figure shows the typical single disc clutch . There are two
flanges . A and B One (A) keyed rigidly to the driving shaft
and other (B) fitted to the driven shaft by feather key or
splines so that it may be moved along the shaft . Driven
flange (B) may be pressed against the driving flange (A) by a
suitable mechanism.
 The torque is transmitted by friction between the flanges
with friction disc . The amount of torque transmitted depends
upon axial pressure , radius of the friction surface and co-
efficient of friction . Single disc clutches are used in
automobiles.
 When large torque is to be transmitted , multidisc clutches are
used in preference to single disc clutch . Multi disc clutch has
more number of contact surfaces having number of driving
and driven discs.

14. Applications

15. • Clutches are used to engage and
disengage the transmission of rotary
mechanical power from one system
element to another. This allows the driven
part of the system to be turned on and off
by controlling its power supply.
• Clutches are used to control the power
from one system element to another. This
avoids shock loads and damage to the
driven parts.

16. • Clutches are used to disengage the drive from
the driven parts. This allows the drive to be
started under ‘no-load ' conditions, which
allows the drive to be operated at its rated
conditions when the driven parts are connected
to it. The system will be cost efficient because it
will be started by a well matched drive.
• Clutches are used as over-running devices. An
over-running clutch allows the drive to transmit
torque to the driven machine in one direction
only.

17. • Clutches are used as torque limiting
devices. A torque limiting clutch
responds to the torque difference
across the clutch. At a predefined
torque difference, it will completely
disengage the two components
connected, or will allow a predefined
amount of torque to be transmitted,
dissipating the excess energy.

18. THANKS
HaveA NiceDay