Mechanical Engineering Exam > Mechanical Engineering Videos > What is Self Locking & Self Energizing Brake, TOM, Mechanical Engineering, GATE
What is Self Locking & Self Energizing Brake, TOM, Mechanical Engineering,
FAQs on What is Self Locking & Self Energizing Brake, TOM, Mechanical Engineering, GATE
| 1. What is a self-locking brake? |  |
Ans. A self-locking brake is a type of brake that automatically locks and prevents rotation of a mechanism when it is not being actuated. It does not require external power or control to maintain its locked position. This type of brake is commonly used in applications where safety is crucial, such as elevators and cranes.
| 2. What is a self-energizing brake? | |
Ans. A self-energizing brake is a type of brake that uses the friction between two surfaces to generate its own braking force. When the brake is engaged, the rotation of the mechanism causes the contacting surfaces to push against each other, increasing the braking force. This self-amplification effect makes the brake more efficient and effective in stopping the motion of the mechanism.
| 3. How does a self-locking brake work? | |
Ans. A self-locking brake typically consists of a brake shoe or pad that is pressed against a rotating drum or disc. When the brake is engaged, the friction between the shoe and the drum/disc creates a force that resists the rotation of the mechanism. This friction force is then transmitted to a mechanism that locks the brake in place, preventing further rotation. The self-locking mechanism can be designed using various mechanisms such as ratchets, pawls, or wedges.
| 4. What are the advantages of self-locking and self-energizing brakes? | |
Ans. Self-locking and self-energizing brakes offer several advantages. Firstly, they provide automatic locking and braking without the need for external power or control, enhancing safety and reliability. Secondly, the self-energizing effect increases the braking force, making the brakes more efficient and effective. Additionally, these brakes are generally compact and lightweight, making them suitable for a wide range of applications. Lastly, they can be designed to handle high loads and provide precise control over the braking action.
| 5. In which applications are self-locking and self-energizing brakes commonly used? | |
Ans. Self-locking and self-energizing brakes find applications in various industries and systems. They are commonly used in elevators, cranes, winches, and hoists to ensure safe and controlled movement. These brakes are also used in mechanical presses, conveyor systems, and industrial machinery to stop and hold heavy loads. Additionally, they can be found in automotive applications such as parking brakes and emergency stop mechanisms.
Text Transcript from Video
In this video we will see what Are Self
energizing and self locking brakes to
understand what is self locking what is
self energizing brakes here I have a
simple diagram of a block brakes in which
the brake drum is rotating in clockwise
direction brake drum is the member which
we want to stop here it is rotating in
clockwise direction then we are having
the brake shoe which I have denoted in
red in color this is the brake shoe or
it is block here we are having a fulcrum
or the fixed end the distance between
the fulcrum and the centre of the block
that is X here we are having a lever
whose length is L at the end of the
lever we are applying effort P the
movement effort is applied block comes
in contact with the brake drum there is
a normal reaction acting in the upward
direction from the break towards o from
the brake down towards the brake so here
I have our end now when the brake drum
it is rotating as I have denoted here it
would be denoting for example if it is
in here I have shown it is in clockwise
direction but if I change the direction
and make it anti clock then if it is
rotating in anti clock direction at that
time here there is a tangential force
which is F suffix T acting towards left
a is the distance between the fulcrum
and the tangential force so to
understand what is self
what is self analyzing I have shown you
a simple example simple diagram of a
brake assembly next here I have written
one formula this formula is of breaking
effort so I have written the formula
breaking effort is given by it is P is
equal to RN into X minus mu a upon L
where RN is a normal reaction X is the
distance between fulcrum and the center
of the block mu is a coefficient of
friction for brake material a is the
distance between fulcrum and tangential
force L is the length of the lever or
handle know what is the meaning of
self-locking brake for that we need to
just look at this formula of braking
effort in the braking effort formula if
I see the quantity R X minus mu a
suppose if X is less than mu a so if x
value is less than mu a then this term
will be negative so therefore the value
of P it will be negative when we say
that the value of P that is effort is
negative it means no effort is required
so how this brake works without any
effort the brain block would be coming
in contact with the brake drum so this
is a case that if we are taking X value
less than mu into a at that time the
effort is negative without any effort I
am NOT applying any brakes either with
hand or with foot but also the brake is
taking place so what we can say that
such kind of brakes they are called as
self locking brakes
so this is the condition of self-locking
that X is less than mu by a so effort
this negative means no effort is applied
and brakes are the braking action has
been taken place so such kind of brakes
would be called as self locking brakes
now if X value is greater X is greater
than mu a then effort P it will be
positive and when the effort value is
positive it means even though we require
small effort but M effort is required in
case of self locking no effort was
required negative effort and the braking
action was taking place here the effort
is positive it means you have to apply a
small amount of effort either with the
help of hand that is by pressing the
brake lever or with the help of foot by
pressing the brake paddle so at least
small amount of effort is required
so such brakes are called as they are
called as self energizing brakes so now
it is very much understood that from
this equation if X value is less than mu
by a so effort becomes negative and such
brakes ourselves locking brakes without
any effort the braking braking action
has taken place we will get stopped
without pressing the brake pedal in case
of self energizing brakes at least you
have to apply a small effort so that the
vehicle stops so here the effort is
positive so the condition for self
locking is that X should be less than mu
a and for self energizing X should be
greater than mu it so I hope in this
video your might have understood what is
the meaning of self locking and cell
energizing brakes
energizing and self locking brakes to
understand what is self locking what is
self energizing brakes here I have a
simple diagram of a block brakes in which
the brake drum is rotating in clockwise
direction brake drum is the member which
we want to stop here it is rotating in
clockwise direction then we are having
the brake shoe which I have denoted in
red in color this is the brake shoe or
it is block here we are having a fulcrum
or the fixed end the distance between
the fulcrum and the centre of the block
that is X here we are having a lever
whose length is L at the end of the
lever we are applying effort P the
movement effort is applied block comes
in contact with the brake drum there is
a normal reaction acting in the upward
direction from the break towards o from
the brake down towards the brake so here
I have our end now when the brake drum
it is rotating as I have denoted here it
would be denoting for example if it is
in here I have shown it is in clockwise
direction but if I change the direction
and make it anti clock then if it is
rotating in anti clock direction at that
time here there is a tangential force
which is F suffix T acting towards left
a is the distance between the fulcrum
and the tangential force so to
understand what is self
what is self analyzing I have shown you
a simple example simple diagram of a
brake assembly next here I have written
one formula this formula is of breaking
effort so I have written the formula
breaking effort is given by it is P is
equal to RN into X minus mu a upon L
where RN is a normal reaction X is the
distance between fulcrum and the center
of the block mu is a coefficient of
friction for brake material a is the
distance between fulcrum and tangential
force L is the length of the lever or
handle know what is the meaning of
self-locking brake for that we need to
just look at this formula of braking
effort in the braking effort formula if
I see the quantity R X minus mu a
suppose if X is less than mu a so if x
value is less than mu a then this term
will be negative so therefore the value
of P it will be negative when we say
that the value of P that is effort is
negative it means no effort is required
so how this brake works without any
effort the brain block would be coming
in contact with the brake drum so this
is a case that if we are taking X value
less than mu into a at that time the
effort is negative without any effort I
am NOT applying any brakes either with
hand or with foot but also the brake is
taking place so what we can say that
such kind of brakes they are called as
self locking brakes
so this is the condition of self-locking
that X is less than mu by a so effort
this negative means no effort is applied
and brakes are the braking action has
been taken place so such kind of brakes
would be called as self locking brakes
now if X value is greater X is greater
than mu a then effort P it will be
positive and when the effort value is
positive it means even though we require
small effort but M effort is required in
case of self locking no effort was
required negative effort and the braking
action was taking place here the effort
is positive it means you have to apply a
small amount of effort either with the
help of hand that is by pressing the
brake lever or with the help of foot by
pressing the brake paddle so at least
small amount of effort is required
so such brakes are called as they are
called as self energizing brakes so now
it is very much understood that from
this equation if X value is less than mu
by a so effort becomes negative and such
brakes ourselves locking brakes without
any effort the braking braking action
has taken place we will get stopped
without pressing the brake pedal in case
of self energizing brakes at least you
have to apply a small effort so that the
vehicle stops so here the effort is
positive so the condition for self
locking is that X should be less than mu
a and for self energizing X should be
greater than mu it so I hope in this
video your might have understood what is
the meaning of self locking and cell
energizing brakes
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Apr 18, 2026 Last updated
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