A drum brake is usually a brake that uses friction due to a set of sneakers or pads that media outward against a twisting cylinder-shaped part called some sort of brake drum.
The term drum brake ordinarily means a brake whereby shoes press on the inner surface on the drum. When shoes press on the outside of the drum, it will always be called a clasp brake. Where the drum is pinched somewhere between two shoes, similar with a conventional disc brake, it is sometimes called a little drum brake, though this kind of brakes are relatively rare. A related type known as a band brake functions a flexible belt or "band" wrapping across the outside of a drum.
The backing plate provides a base to the other components. The back plate also increases the rigidity of whole set-up, helps the housing, and protects it coming from foreign materials like dust and various road debris. It absorbs the torque through the braking action, and that's the reason back plate is referred to as the "Torque Plate". Since all braking operations exert pressure to the backing plate, it has to be strong and wear-resistant. Levers regarding emergency or parking brakes, and automatic brake-shoe adjuster were also added nowadays.
The brake drum is usually made of a special type of cast iron that is usually heat-conductive and wear-resistant. It rotates using the wheel and axle. Whenever a driver applies the brakes, the lining pushes radially resistant to the inner surface of your drum, and the ensuing friction slows or stops rotation from the wheel and axle, and thus the vehicle. This friction generates substantial heat. On this design, one of the particular brake shoes always things the self-applying effect, regardless of whether the vehicle is changing forwards or backwards. [5] This can be particularly useful on this rear brakes, where the parking brake (handbrake or perhaps footbrake) must exert enough force to halt the vehicle from travelling backwards and hold it with a slope. Provided the contact class of the brake shoes is usually large enough, which isn't forever the situation, the self-applying effect can securely hold a car or truck when the weight is transferred towards the rear brakes because of the incline of a downward slope or the reverse way of motion. A further advantage of by using a single hydraulic cylinder on the rear is that the opposite pivot may be made comprising a double-lobed cam that is definitely rotated by the action of the parking brake system.
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