Mechanical brake, Internal Expanding brake, External Contracting Brakes

Automobile

Mechanical brake

Mechanical brakes are classified into two different types, they are shown as follow

1. Internal Expanding Brake
2. External Contracting Brake

Internally Expanding Brake

In this braking system the brake shoes are mounted inside of brake drum
and the lower ends of brake shoes are connected with help of anchor pins and brake carrier plate. Based on this the movement of brake shoe is positioned. In between the upper ends of brake shoes one brake cam is mounted. Brake pedal is located at the right side corner of the driver’s leg. When the brake pedal is pressed, a long rod which is connected with
the brake cams in the four brake carrier plate simultaneously are expanded inside the brake drum which causes friction that stops the rotating wheel. When the brake pedal is released, the brake cam is brought to its original position. The brake shoes are also brought to their original positions at the same time without touching the brake drum due to the spring’s compressive force. Hence the wheels on the brake drum rotate immediately without
any friction.

Externally contracting type brake

This type of braking system is mostly used in cars as hand brake. In this system the outer layer of the brake drum has a brake lining which is contact with the brake band. The brake band is operated by brake lever and the linkages to stop the rotating brake drum. By pulling the hand brake lever, the brake band is forced to press the brake drum tightly. Hence the rotation of brake drum is stopped and the vehicle is stopped. When the hand lever is released, the brake band is loosened and the force acting on the brake drum is released. Due to this action the wheels connected with the brake drums are started to rotate without any
difficulties.

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