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The principle of disc brake is: when braking, the oil is pressed into the inner and outer wheel cylinders, and its piston presses the two brake blocks against the brake disk under the action of hydraulic pressure, which generates friction torque and braking. Disc brake has hydraulic type, controlled by hydraulic pressure, the main parts are brake disc, pump, caliper and oil pipe, disc brake heat dissipation fast, light weight, simple construction, easy to adjust.
Brakes are divided into drum brakes and disc brakes, both of which convert friction into heat to achieve parking.
Disc brake disc: mounted on the wheel hub and rotates synchronously with the hub.
Brake Caliper: It is internally equipped with brake linings, hub actuator, and piston to hold the brake linings in place.
In a disc brake, the brake disc is connected to the hub and rotates synchronously, and the brake linings in the caliper clamp the brake disc from both sides to produce braking. Generally, one side of the brake lining is fixed to the caliper, and the other side is pressed against the brake disk by oil pressure.
Disc brakes are exposed to the outside, making it easier to release the heat generated into the atmosphere.
The operating principle of the disc brake is that when the driver depresses the brake pedal, the oil in the brake master cylinder generates pressure, and the oil flows into the wheel cylinder of each wheel through the brake fluid pipe, and the pressure is finally transferred to the piston of the wheel cylinder, and the movement of the piston makes the brake lining block press against the brake disc, and the braking of the wheel is completed.
Drum Brake In drum brake, the inner side of the cylindrical brake drum is connected to the wheel hub, synchronized with the rotary movement, and there is a pair of brake shoes on the inner side of the drum, on which the friction lining made of friction material is affixed to realize the braking when the brake shoes are pressed against the brake drum, and the drum brake, due to its structure, has the effect of self-increasing force itself.
Although this type of brake has high braking performance, it has poor heat dissipation and is prone to thermal degradation. In addition, when water enters the drum brake, its recovery is poor.
Thermal recession: A phenomenon in which the friction torque of a brake decreases significantly due to a rapid rise in temperature.
When oil pressure is transmitted to the wheel cylinder, the piston in the wheel cylinder presses the brake shoe against the brake drum to cause friction, thus realizing braking. The brake shoe on the side of the direction of travel is called the leading shoe, and the one on the other side is called the slave shoe. Collar shoe pressure rotating brake drum, its opening direction and the direction of rotation of the brake drum, so the brake drum pressure on the collar shoe is greater than the wheel cylinder acting on the collar shoe of the driving force. This action becomes a force multiplier, so there is no need to install an additional booster in drum brakes.