The general working principle of the brake system


From the perspective of economy and practicality, car d […]

From the perspective of economy and practicality, car designers use a hybrid form of front-wheel disc brakes and rear-wheel drum brakes. During the braking process of the four-wheeled car, the load of the front wheel usually accounts for 70%-80% of the total load of the car due to the inertia, so the front wheel braking force is larger than the rear wheel. In order to save the cost, the car manufacturer uses the front wheel disc brake and the rear wheel drum brake. The mid-to-high-end sedan with four-wheel disc brakes uses front-wheel ventilated disc brakes for better heat dissipation. The use of non-ventilated discs on the rear wheels is also a reason for the cost. The ventilated disc manufacturing process is much more complicated and the price is relatively expensive. With the development of materials science and the reduction of capital, in the field of cars, disc brakes have gradually replaced the trend of drum brakes.

Generally, the brake applies a braking torque to the rotating element through the fixing element therein, so that the rotational angular velocity of the latter is lowered, and at the same time, depending on the adhesion of the wheel to the ground, the braking force of the road facing the wheel is generated to decelerate the vehicle. A brake that generates a braking torque by friction between a fixed element and a working surface of a rotating element becomes a friction brake. At present, the friction brakes used in automobiles can be divided into two types: drum type and disc type.

The rotating element is fixed on the wheel or the half shaft, that is, the brake that directly acts on the wheels on both sides of the braking torque is called a wheel brake. The rotating element is fixed to the drive shaft of the drive train, and the brake torque is redistributed via the drive axle to the brakes on the wheels on both sides.