Band Brakes, types of Band Brakes, Working And Construction of Band Brakes

1. S.B. JAIN INSTITUTE OF
TECHNOLOGHY MANAGEMENT &
RESEARCH
MECHANICAL DEPARTMENT
PRESENTED BY:- KHUSHAL A HUDKE
GUIDED BY:- SIR. FAISAL HUSSIAN
TOPIC:- BAND BRAKES

2.  A band brake is a primary or secondary brake,
consisting of a band of friction material that
tightens concentrically around a cylindrical piece
of equipment to either prevent it from rotating or to
slow it.
BAND BRAKE
 A band brake consists of a flexible band of
leather, one or more ropes, or a steel lined with
friction material, which embraces a part of the
circumference of the drum.

3.  A band brake is also called a simple band
brake
 In which one end of the band is attached to a
fulcrum of the lever while the other end is
attached to the lever at a distance b
 When a force P is applied to the lever at C,
the lever turns about the fulcrum O and
tightens the band and hence the brakes are
applied. .
 band is wrapped part round a rotating
drum.
 Tension can be applied to the band using a

4. Construction of band brake
 Band brake is made of rope or belt band which
is lined with a friction material .
 Band is wrapped partially around a drum with
its free ends to a lever
 An external force can be applied to the free
ends of this lever for breaking

5.  Due to addition of a external force there is a
friction between the bands
 Due to this friction force, the Band is tighten and
a tangential force acts on the drum
 The tightening of the bands creates a tension in
the band
 It stop the wheel connected.

6. Working of band brake
When released
 When the brake band is released,
there is no hydraulic pressure applied
to the servo and the drum is free to
rotate within the band
.

7. When applied
 Hydraulic pressure is applied to the servo that,
in turn ,tightens the band around the drum
 The result is that the drum is locked in a
stationary position, causing an output change
from the planetary gearset

9. Let
T1 = Tension in the tight side of the band,
T2 = Tension in the slack side of the band,
θ = Angle of lap (or embrace) of the band on the
drum,
µ = Coefficient of friction between the band and
the drum,
r = Radius of the drum,
t = Thickness of the band, and
re = Effective radius of the drum = r + t /2.
P.l=T1.bfor clockwise direction
P.l=T2.bfor anticlockwise direction

10. Classification of Band Brake
Band brake can be classified as
 Simple band brake
 Differential band brake

11. Simple Band
brake
Differential
Band brake
Fulcrum is
at one end
of liver
Is not self
energizing
Is not self
locking
Differential
Band brake
Fulcrum is
betn. two
ends of
lever
Is always
self
energizing
It can be
self locking
Difference

12. Bibliography
 http://sounak4u.weebly.com/block-and-band-
brake.html
 https://www3.nd.edu/~manufact/FME_pdf_files/FME3
_Ch18.pdf

13. Thank you