Introduction of the structure and working principle of the hydraulic brake system

Category:Brake system foundation - Date:2015-11-22

What components are composed of hydraulic brake

The hydraulic brake system uses the brake oil liquid as the force transmission medium, and passes the driver's pedal force to the wheel brake, and then changes the oil pressure into the thrust of the brake shoe to open the brake shoe, making the brake shoe to produce the brake effect. The advantages of hydraulic braking are simple structure, gentle and sensitive braking, good braking stability, and able to adapt to many kinds of brakes. Nowadays, hydraulic braking is widely used for cars and small passenger cars.

Composition diagram of hydraulic brake system

The hydraulic brake system mainly consists of brake pedal, vacuum pump, brake master pump (also known as brake master cylinder), brake fluid (also called brake oil), brake tubing, ABS pump assembly, brake pump (also called brake wheel cylinder) and wheel brake.

The physical diagram of the vacuum pump and the total brake pump

the structural schematic diagram of the hydraulic brake master cylinder (main cylinder).


the basic working principle of the hydraulic brake system

The brake general pump, brake fluid, sub pump and connecting oil pipe are filled with brake fluid (also called brake oil). They make up a closed pressure transfer system. When stepping down the brake pedal, the piston of the total pump moves forward, the pressure of the brake fluid in the total pump rises, and the oil pipe enters the sub pumps of the wheels and pushes the sub pump into the pump. The piston rises outward, realizes the transmission of pedal braking force to the wheel brake, and promotes the brake implementation of the wheel brake.


the pressure transfer system consisting of the brake master pump, the oil pipe, the brake fluid and the sub pump.

brake pedal, main pump, tubing, sub pump and wheel brake diagram.

when the brake pedal is loosened, the piston of the total pump is back under the action of the oil pressure and the back spring, and the piston and the wheel brake are returned to the wheel, and the brake of the wheel is relieved.


Brief introduction of wheel brake

In order to realize the brake of the wheel, the wheel brake is installed on each wheel. When the pressure brake fluid from the brake general pump pushes the piston of the pump to move, it contacts the brake disc with the rotating brake disc or the brake drum to produce friction torque, which causes the car to decelerate and stop.

- disc disc brake means high performance brake in people's eyes

there are two kinds of wheel brakes for automotive applications, and now four wheel disc brakes are widely used in cars, while some micro cars and low end cars use front wheel disc type and rear wheel drum brakes, and the early mini cars use four wheel drum type brake.

drum brakes are less and less used in cars.


How does the motive force produce

For many people, braking comes from friction torque produced by contact friction between brake disc and rotating brake disc or brake drum to drive the car to decelerate and stop. I think so, too. Actually, I don't want to study more about the deep theory of braking force.

the 1 system power comes from a reaction force on the wheels of the road. Of course, the reaction is induced by the friction torque produced by the contact friction between the brake disc and the rotating brake disc or the brake drum.

the power of the 2 system depends not only on the friction torque, but also on the adhesion between the tire and the pavement (it equals the product of the vertical load on the tire and the adhesion coefficient between the tires and the pavement), that is, the maximum braking force can only be equal to the adhesion. The size of the friction force depends on the tension of the wheel cylinder, the friction factor and the size of the brake drum and brake shoe.

3. When braking force is equal to the adhesion, the wheels will be locked in the road slip. The slippage causes the tread to wear seriously, leaving a black tow on the road surface. At the same time, the partial high temperature of tread and the partial thinning of tread appear as if a layer of lubricant is separated between the tire and pavement, so that the adhesion coefficient decreases. The maximum braking force and braking distance is the shortest, at the wheel will be locked and not completely locked when.

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