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Mechanical Brake System | Drum Brake

Ajay Singh

mechanical brak system Mechanic37.in

Mechanical Brake :- Mechanical Brake is Used for Light Vehicle. the wheel is attached to an auxiliary wheel called Drum. the brake shoes are made to contact this drum. mainly in bike Moter Cycle Scooter In this type of brake system power in transmitted through mechanical linkage From Brake paddle to the brake Shoes to Actuate on brake Drum on Wheel rim

Main Function Of Brake System

  1. Control the driving of the Vehicle
  2. IT Stop the Vehicle and slow Down the Speed of the vehicle
  3. It must have strong braking farce
  4. It Must operate easily

The wheel attached to an auxiliary wheel called Drum. the Brake Shoes are made to contact this Drum in most designs two shoes are used with each drum to form a complete brake mechanism at each wheel , the Brake Shoes have brake linings on their outer Surface. Each brake shoe is hinged at one end by an anchor pin, the other end is operated by some means so that the brake shoe expand outwards the brake linings come into contact with the drum. Retracting spring keeps the brakes shoes into position when the brake  are not applied. the  drum enclose the entire Mechanism to keep out dust and moisture. the wheel-attaching bolts on the drum are used to contact wheel and drum . Mechanical brakes are assemblies consisting of mechanical elements for the slowing or stopping of shafts in equipment drives. They use levers or linkages to transmit force from one point to another. Braking slows or stops the movement of the coupled shafts. There are several types of mechanical brakes. Band brakes, the simplest brake configuration, have a metal band lined with heat and wear resistant friction material. Drum brakes, which are commonly used on automobile rear wheels, work when shoes press against a spinning surface called a drum. Disc brakes are constructed of brake pads, a caliper, and a rotor. During operation, the brake pads are squeezed against the rotor. Cone brakes are made with a cup and a cone, which is lined with heat and wear resistant material. During actuation, the cone is pressed against the mating cup surface.

Mechanic Brakes parts:-

  1. Brake Drum
  2. Brake Shoe
  3. Brake Lining
  4. Toggle Lever
  5. Retractor spring
  6. Anchor Pins

Brake Drum:– The Brake Drum is mounted on axle Hub. The Friction Material is pasted or Biretta on Brake Shoes the expanded (cam) Expander. The Brake Shoe and Press on Drum. Due To Friction Action Brake Will get Applied

A drum brake is a brake in which the friction is caused by a set of shoes or pads that press against a rotating drum-shaped part called a brake drum.

Brake Shoe :- As the brake pedal is pressed cam rotates, which pushes the brake shoes outwards and hence brake lining provided on the outer surface of the shoes rub against rotating the drum and hence slow down or stops the vehicles because the drum is connected to the wheels. As the pedal is released, due to retracting spring force shoes return to its original position. Brake Shoe material Steel, copper, iron and several alloys with durable and heat resistant qualities are often used in the production of brake shoes.

Brake Lining :- This material was designed for low temperatures and high friction. The material offers excellent riveting strength and is suitable for gluing. It offers limited oil resistance and is not recommended for applications immersed in oil.

The most important areas of application are braking systems requiring a very high friction coefficient but in which temperatures are not excessively high. Examples are static winches, bracket systems and cone clutches for hoists.

Toggle Lever:- When the Brake pedal is pressed, the cam turn by means of Brake linkage. When the cam turns, the Shoes expands outward against be Drum and thus stop its motion. the entire

 

Retractor spring:-The job of the retractor spring is to keep the shoe away from the brake drum. When the shoe turns forward through the cam, the retractor springs back to you. It is used to retract the brake shoe after brake is applied. Two return springs are there in durm brake, one for the primary shoe and other one is for secondary shoe.

Anchor Pins:- The job of Anchor Pins is to keep the Brake Shoe fixed in one place. It maintain the minimum gap between the brake shoe and drum so that they do not contact each other when pedal is not pressed. In the case if the brake lining wear out, and gap increases in between the shoe and drum, It can be adjusted again to maintain the gap between shoe and drum inner surface. once it is adjusted it maintains the same gab during the brake working by itself.

Advantages

  1. They are self energizing braking system. It means they are designed to operate by itself.
  2. It is cheaper than the disc braking system.

Disadvantages

1. Heating problem: Since the friction area is totally covered by lining, so heat is developed during the friction is not allowed to go out in the atmosphere. This may reduces the braking efficiency of the vehicle.

2. The drum brakes will not work properly if it gets wet in water. This is because water takes longer time to come out from the drum. the water reduces the friction in between the brake lining and drum.

In this article we have learnt about how drum brakes works and its main parts, working principle with advantages and disadvantages . If you like this article than don’t forget to share

 

 

 

 

 

 

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