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 The principle of automotive brake
Double-click automatically scroll Publisher: admin Published :2012 -7-23


The brake works mainly from the friction brake pads and brake discs (drums) and the friction of the tire and the ground converted into the kinetic energy of the vehicle moving after the heat of friction to stop the car. A good efficiency of the braking system must be able to provide a stable, sufficient braking force control, and hydraulic transmission and cooling capacity to ensure that the force applied by the driver from the brake pedal fully and effectively reached the master cylinder and the wheel cylinder, and avoid high fever caused by hydraulic failure and brake recession. The car on the brake system is divided into two major categories of disc and drum, but in addition to cost advantages, the efficiency of drum brakes is far smaller than the disc brakes, the braking system discussed in this article will only disc brakes based. Or is it destined to sorrow and your new car maintenance good whether it has a great relationship.

 
Friction

 
"Friction" refers to the two relatively moving object contact surface between the resistance movement. The size of the friction force (F) is proportional to the product of the bearing surface friction coefficient (C) and friction suffered by the vertical direction of positive pressure (N), physics formula: F = (N. Brake system : (which is to make a piece brake discs, friction coefficient, N is the brake caliper piston force exerted by the brake pads (Pedal Force), the greater the friction generated by the friction coefficient, but to the film because of the heat produced by the friction coefficient of friction between the disc change, which means that the friction coefficient (C) varies with temperature changes, each of which make the film because of the different materials have different the friction coefficient curve, so different to the film will have different optimal operating temperature, and the applicable operating temperature range, which is optional to make the films must know.

 
Brake force transmission

 
Brake caliper piston to pad the applied force is called: the brake pedal force (Pedal Force). The driver stepped on the brake pedal force through the lever of the pedal bodies after the amplification effect, the principle of vacuum pressure difference through the use of vacuum power assist device (power boost), then the power of amplification, used to push the brake master cylinder. Power transmission effect, issued by the brake master cylinder fluid pressure to use the liquid incompressible passed through the brake hose to each wheel cylinder, and use "the Pascal principle" pressure amplification, and promote the force of the wheel cylinder piston brake pads. "Pascal principle" (Pascal's Law) refers to any position of one are the same pressure in a closed container.

 
The pressure is under pressure equal to force divided by the proceeds of the force area, we are using to change the facilities, by the proportion of the size of the force area to achieve the effect of dynamic amplification (P1 = F1/A1 = F2/A2 = P2) . In the brake system, master cylinder and wheel cylinder pressure ratio is the ratio of master cylinder piston area and wheel cylinder piston area.