# What are Brakes Types of Brakes explained (animations) – MechStuff

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```12/19/2018
What are Brakes ? | Types of Brakes explained (animations) – MechStuff
(http://mechstuff.com/)
MechStuff (http://mechstuff.com/)
What are Brakes ? | Types of Brakes explained
(animations) (http://mechstuff.com/working-types-ofbrakes-animations-application-automobiles/)
“
With great power, comes great BRAKES
(http://m
types-o
autom
”
http://mechstuff.com/working-types-of-brakes-animations-application-automobiles/
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12/19/2018
What are Brakes ? | Types of Brakes explained (animations) – MechStuff
that was just my honest attempt to make you laugh Well, that is what I think about brakes. If you have a car with a powerful engine which could run fast as a cheetah but doesn’t have
enough powerful brakes to stop it OR control it, you better sell it ASAP
.
So today in here, we’ll see what are brakes & the types of brakes !
What are Brakes ?
Brakes are mechanical devices which absorb the kinetic energy of the system & convert it into any other form of energy(generally heat)
in order to stop a moving system.
They are not only used to stop a moving system but also to prevent motion of any part of a particular system.
We generally see them mounted on the end of the shafts & axles of vehicles.
Types of Brakes :1. Friction brakes
2. Hydraulic brakes
3. Electromagnetic brakes
Friction brakes :In frictional braking, the kinetic energy is converted into heat energy by means of friction thereby preventing any further movement of
the part of any system.
The most commonly used friction brakes are –
1. Pivoted type Shoe brake :In this type, a block OR a shoe is attached to a lever & is pressed against a rotating drum(wheel). One end of the lever is pivoted at a
point(on the chassis somewhere) & force(P) is applied on the other end. Human applies force(F) via pedals but is not enough to produce
the braking torque. Here comes the lever; the lever multiplies the force(F) by some constant(C) to produce greater force(P) to generate
enough pressure between drum & shoe !
Working of a shoe & block brake
(https://i1.wp.com/mechstuff.com/wp-content/uploads/2017/05/shoe-brake.gif)
Working of a shoe & block brake
More the lever distance, less the human effort ! This is important while designing ergonomics of the vehicle !
The constant C depends on the length of lever, distance between contact point of shoe and drum & pivot point. In the animation, my
hand applies force(F) & the force which get applies on the drum is much greater force(P) !
Another version of these brakes contain 2 shoes on the opposite side to increase the braking torque. Such types are called Pivoted type
double shoe brake. They are widely used in trains even now. Look around the wheels next time while you travel; they’re fairly easy to
notice !
2. Band brake :working of a band brake
(https://i0.wp.com/mechstuff.com/wp-content/uploads/2017/05/band-brake.gif)
Working of a band brake
A band brake, as seen in our animation basically contains a lever & a band which gets rubbed against the drum(wheel). One end of the
lever is attached to a x point also called as pivot point & force is applied to the other end. The band consists of a
exible leather belt
OR steel lined with with friction material. The band surrounds the drum with some clearance.
As soon as the pedal is pressed, the band gets rubbed against the drum which eventually comes to rest.
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What are Brakes ? | Types of Brakes explained (animations) – MechStuff
3. Disc brakes :Disc brakes are the most widely used brakes & can be seen in almost every application such as bicycles, bikes, cars etc.
Here in disc brakes, 2 pads possessing high friction are used instead of shoes. These pads are arranged such that the the disc is exactly
mounted between the two brake pads. The brake pads are connected & operated with the
help of multiple levers, jaws & spring.
Working of a lever operated disc brake
(https://i2.wp.com/mechstuff.com/wp-content/uploads/2017/05/disc-brake.gif)
Working of a lever operated disc brake
We could see in the animation that when we press the brake pedal, the motion is transmitted via levers & the brake pads apply
pressure on the disc from both the sides. The braking force then tries to retard the motion of disc thereby bringing the vehicle to a halt.
In cars, the brake pads are usually mounted in the calipers wherein they’re pushed with the help of hydraulics. Brake
uids are used to
push the pads towards the disc.
An animation of the same is covered below in hydraulic braking.
4. Band & block brake :Working of band & block brake
(https://i0.wp.com/mechstuff.com/wp-content/uploads/2017/05/band-blockbrake.gif)
Working of band & block brake
The working of band & block brake is pretty much similar to band brakes except that they contain blocks between the band & drum. The
blocks maybe wooden or any other friction lined material.
More the number of blocks, more is the braking force & thus higher retardation. These types of brakes were widely used in trains.
5. Internally expanding brakes :Here, the friction lined shoes are placed inside the rotating drum. Both diametrically opposite
shoes are C-shaped.
One end of both the shoes are
xed on a point i.e their fulcrum(lower side in our animation).
While the other end is connected to cam operated lever & a retractable spring(upper side of drum
in animation).
In our animation, when we rotate the cam the brake shoes get expanded in radially outward
Working of internally expanding
cam operated brakes
(https://i2.wp.com/mechstuff.co
m/wpcontent/uploads/2017/05/interna
lly-expanding-brake-shoe.gif)
direction thus applying pressure on the inner surface of drum. A force called as braking force gets
applied due to this applied pressure & the drum’s motion is brought to rest. When we release the
cam, the spring having the tendency to contract, pulls the shoes towards itself allowing the drum to
rotate again.
http://mechstuff.com/working-types-of-brakes-animations-application-automobiles/
Working of
internally
expanding brakes
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What are Brakes ? | Types of Brakes explained (animations) – MechStuff
Hydraulic Braking :Animation showing a hydraulic braking system
(https://i0.wp.com/mechstuff.com/wpcontent/uploads/2017/05/Hydraulic_disc_brake_diagram-1.gif)
Animation showing a hydraulic braking system
Animation credits :- By KDSS444 (https://commons.wikimedia.org/wiki/User:KDS4444)
Hydraulic brakes are basically a system where brake
uids are used to operate braking mechanism i.e to generate pressure on brake
pads & thus to push them towards drum or discs. The brake
As you can see, the brake
uids are generally contain glycol ethers or diethylene glycol.
uid is placed in a master cylinder(reservoir); when you press the pedal, rst some extra
uid enters into
uid
lines through inlet port. When you further push it, pressure is generated into tubes & in calipers. This pressure forces the pads to get
close to the disc.
Alternately, in a drum type brake the brake
uid is pushed into a wheel cylinder which pushes shoes instead of pads.
The reason why a combination of disc brakes & hydraulic braking systems are used because they have good e ciency as well as high
heat dissipation rate.
You might like – Why are brake lights red ?
(http://mechstuff.com/why-are-brake-lights-red/)
Electromagnetic braking :Electromagnetic brakes slows the speed of an object through electromagnetic induction which creates resistance & converts the motion
into electrical or heat energy. Such systems in which the converted energy is immediately used for other purpose or stored for later, are
called as Regenerative braking systems (https://en.wikipedia.org/wiki/Regenerative_brake).
An example of electromagnetic braking systems are the Eddy current brakes used in some trains. When permanent magnets are brought
near the rotating wheels, eddy currents are produced thus resisting its own motion according to Lenz’s law. Higher the magnetic
induction, greater the resistance & thus higher resistances are able to stop the train. Electromagnetic brakes are also used in roller
coasters.
I hope you have got a good clarity on the topic after reading this. Comment down below if you have any questions. I’ll be very glad if I
could be any help to you !
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