Nur syuhada binti Samut (f1108)

1. BRAKES AND
CLUTCH
NUR SYUHADA BINTI SAMUT

2. Clutch is a one of the form of coupling .
Clutches is used to transmit the power from driving shaft to driven shaft of
machine which may be required to start or stop frequently .
It is so designed that the two members may be engaged or disengaged whenever
required either by a hand operated device or automatically by the action of some
power driven devices .
CLUTCHES

4. This type of clutches consists of two
flanges , one flange is rigidly to the
driving shaft and other flange fitted to
the driven shaft .
Single disc clutches are used in
autoobiles
When large torque transmission is
required the multi disc clutch are used .
Multi disc clutch has more number of
contact surfaces disc on driving and
driven shaft
DISC CLUTCHES

6. The clone clutch consists two cones ,
one internal cone fixed to the driven
shaft and another cone fitted on the
driven shaft .
The main advantage of cone clutch
over the disc clutch is very simple
and required less axial pressure to
disengaged the clutch
The operating lever used only for
disengagement of the clutch .
Cone clutch

8. It consists of a number of shoes
on the inside of a drum or rim
of the pulley
The upper surface of the shoes
are covered with a friction
material .
The spider is fitted on the
driving shaft
When centrifugal force is equal to
spring force , the shoes is just
floating . But, when centrifugal
force higher than the spring force ,
the shoes moves outward and
comes into contact with the driven
member and pressure against it .
The increase of speed causes
the shoes to press harder and
clutch transmit more power .
CENTRIFUGAL
CLUTCH

10. Driving flange rigidly keyed to the
driving shaft while the other flange is
keyed to driven shaft by splines so that
it can slide on that shaft .
It is consists of segmental projections on
one of the flange and corresponding
recesses on other flange on the driven shaft
.
The sliding flange engage with the fixed
flange to transmit the motion and power
from driving shaft .
This clutch is used for the transmission of
power in agricultural equipment like
tractor , thresher , etc .
JAW
CLUTCH

12. A brake is a mechanical device
which produces frictional resistace
against moving machine member,
in order to slow down the motion
of machine .
In the process of performing
this function , the brake
absorbs potential energy of
lowering member .
BRAKES
The energy absorbed by
brakes is released to
surrounding in form of
heat .

13. A brake is mechanical
device which produce
frictional resistance
agains moving machine
member, in order to
slow down of machine .
In the process of
performing this
function, the brake
absorbs kinetic energy
of moving member
and brake absorbs
potential energy of
lowering number .
The energy absorbed by
brake is released to
surrounding in form of
heat .
BRAKE APPLICATION

15. BLOCK BRAKE
1) Single block or shoe brake :
A single block is consists of a block which is pressed
against the rim of revolving brake wheel drum .
- This brake is used in railway trains and tram cars. The
prony brake is example of block brake .

17. It consist of two brake
blocks at the apposite ends
of the wheel .
These shoes apply force to
both the sides of wheel
and reduces the
unbalanced force on the
shaft
This spring pull the upper
end of the brake arms
together and brake is
applied .
When a force is applied to
the hell crank level , the
spring is compressed and
the brake is released .
This brake is used in
electric cranes . The bicycle
brake is example of double
block brake .
DOUBLE BLOCK OR SHOE BRAKE

19. A band brake consists of a flexible
steel band lined with friction
material, which wrap to the brake
drum. When an upward force is
applied to the lever end, the lever
turns about the fulcrum pin and
tightens the band on the drum and
hence the brakes are applied .
The friction between the band and
the drum provides the braking force
.
This type of brake is used in civil
construction equipment and also in
automobiles as hand brake. The
rope brake is example of band
brake .
BAND BRAKE

21. INTERNAL
EXPANDING
SHOE
BRAKE
An internal
expanding shoe
brake consists
of two shoes.
The outer
surface of the
shoes are
covered with
friction material
.
Each shoe is
pivoted at ne
end about a
fixed fulcrum
and other end
rests against
cam
When the cam
is operated, the
shoe are
pushed
outwards
against brake
drum.
The friction
between the
shoes and the
drum produces
the braking
torque
This type of
brake is
commonly used
in motor cars
and light trucks.

23. Disc brake are different from
drum brakes in that the drum is
replaced by a circular metal disc
and the brake shoe are replaced
by a caliper which supports a
pair of friction pads, one on
each side of the disc .
These pads are forced
inward by the operating
force and also retart the disc
DISK BRAKE

25. THANK
YOU