The brake drum is a tambourine-shaped cast iron that is fixed to the tire and rotates at the same speed. When braking, oil pressure is used to push the BrakeShoes (BrakeShoes) to contact the inner edge of the brake drum, and the friction generated by the contact is used to restrain the rotation of the tire to achieve the purpose of braking. Drum brake is composed of brake bottom plate, brake pump, brake shoe and other relevant connecting rod, spring, pin, brake drum. Currently, it is only commonly used for rear wheels. Drum brake has lower cost and higher absolute braking force, and is widely used in the rear wheels of small cars. But its wear rate is high, so at the same time the overall cost is high.

The characteristics of

1. The groove can block the free extension of some surface cracks.

2, the groove can resist the thermal expansion deformation of the drum body, maintain the inherent shape of the high temperature state.

3. The groove establishes a heat discharge channel for the center part of the drum body.

4, the groove can overcome the oil, water wet caused by the skid, prevent brake failure.

5, spiral groove brake drum can prolong the service life of the brake.

advantages

Self-brake action: Good since the brake drum brake, due to the brake to make out, combined with the rotation of the wheels of the brake drum distort an Angle (of course, but not big enough to let you easily can see) brake to land tension (dynamic braking system), the greater the situation becomes more obvious, therefore, generally large vehicles or use drum brake, in addition to lower costs, The only difference between a large and a small car's drum brake may be that large cars use pneumatic assist, while small cars use vacuum assist to help brake.

Lower cost: Drum brake manufacturing technology is lower, is also used in the first brake system, so the manufacturing cost is lower than disc brake.

disadvantages

Due to the drum brake to seal the disc in the brake drum, resulting in the brake chip wear after the chip can not be dispersed, affecting the contact surface of the brake drum and the brake performance.