Introduced the component of Drum brakes

     Drum brake also known as block brake, brake pads on the brake wheel is tightly pressed to realize brake. The drum brake is abrake system in early design, the brake drum design in 1902 had been used in the carriage on until around 1920, began to be widely used in the automobile industry. Now the mainstream of drum brake is a brake block type, its (brake) is located in thebrake wheel, the brake when the brake block is opened outwards, inner friction brake wheel, brake to achieve. In the last thirty years, drum brakes in the car in the field has beengradually withdraw from giving way to the disc brake. But becausethe cost is relatively low, still used in some economic type of car,mainly used for rear wheel braking load is relatively small and the parking brake.

Electromagnetic Clutches And Brakes

     Component

     The rotating element of drum brake is a brake drum brake shoe,the fixing element is. Brake shoe

The actuating device under the action of friction plate outward rotation, the outer surface of the pressure on the brake drum on the inner cylindrical surface, the brake friction torque on thedrum.

Every device on the hoof of the shoe end force rotatingcollectively referred to as the brake shoe actuating device, brake shoe actuating device, a wheel cylinder cam and wedge.

The hydraulic brake wheel cylinder brake shoe and brake deviceis called the wheel cylinder brake; the cam as promoting brakedevice called a convex wheel brake; with the wedge as promotingbrake device called the wedge brake.

     Drum brakes are more complex in many places, the drum brakeis self acting. When the contact of the brake shoe and drum,there will be a wedging action, its effect is to brake shoe pressurein the drum with the larger braking force. The additional brake force wedging action to provide, can let the drum brakes use than piston disc brake for smaller. However, due to the presence of a wedge action, to release the brake, brake drum must be made from. This is the reason some spring. Spring will help thebrake shoe is fixed in place, and after adjusting arm drive make it back.

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