ENGLISH 7_Q4_LESSON 2_ Employing a Variety of Strategies for Effective Interp...
Tom
1. Subject : TOM (03109301)
Name: Alpesh C patel
ENRL No : 160303109749
Class: 5A6
TYPES OF BRAKES
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2. A brake is a mechanical device which produces
frictional resistance against moving machine member, order to
slow down the motion of machine.
In the process of performing this function, the brake
absorbs kinetic energy of moving member and the brake
absorbs potential energy of lowering member.
The energy absorbed by brakes is released to
surrounding in form of heat
Brakes
4. Band brake
It consist of two brake blocks at the opposite 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 bell 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
7. 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 one 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.
9. Disc brake
Disc brakes are different from drum brakes in that the drum is replaced by
a circular metal disc and the brake shoe are replaced by a aliper 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 retard the disc.