Chap 5 Brakes - Lecture Note Chap-5 Brakes Motor Vehicle...

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Lecture Note Chap-5: Brakes Motor Vehicle Engineering MEng 5165 By: Shewangizaw W
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Introduction A moving vehicle possesses kinetic energy whose value depends on weight and speed of the vehicle. The engine provides this energy in order to accelerate the vehicle from res to a given speed. But this energy must be partially or totally dissipated when the vehicle is slowed down or brought to standstill. Therefore, it is the function of the brake to do this.
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Cont… In present-day vehicles the wheel brakes are usually operated by a foot pedal and are the ones used on most occasions. They are sometimes referred to as the service brakes. The brakes on the rear wheels can generally be operated also by a hand lever and are used chiefly for holding the vehicle when it is parked and are consequently called parking brakes. But as they can, of course, be used in emergencies they are sometimes called
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5.1 Types of drum brake Generally, there are three types of drum brake 1. Leading trailing shoe drum brake 2. Two leading shoe drum brake and 3. Duo servo drums brake. Leading trailing shoe drum brake •. Both forward and rear shoes are held stationary at the bottom. •. The forward shoe has self-energizing effect due to drum rotation but the rear shoe don not has this effect.
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