1. The brake system
turns the wheels of the car because it can travel on the road, when the car to stop, how to do it? Motorists not like his legs to the same cartoon ground to stop the car forward, this time you have to rely on the car’s brakes to reduce the speed of the car and stopped.
Composition
by a brake system control system, hydraulic system, and power system. .
1 control system: a pedal, hand brake and the like. .
2 Hydraulic system: a hydraulic fluid, brake pump, consisting of hydraulic tubing.
The hydraulic oil is introduced by the hydraulic fluid pressure medium can be used in hydraulic systems, hydraulic energy transfer system plays the role of lubrication systems, corrosion, rust and cooling. For the hydraulic oil, a first hydraulic device should meet at operating temperature at the start of the viscosity of the liquid temperature requirements, due to changes in viscosity of the oil hydraulic operating directly, related to transmission efficiency and transmission accuracy, also called viscosity-temperature properties of the oil and shear stability should meet the needs of different proposed uses.
by a brake master cylinder brake pump (Master Brake Cylinder) and the brake wheel cylinder (Front amp; Rear Wheel Brake Cylinder) composition, with the main part of a hydraulic brake, brake oil groove thereon savings pool, the bottom is equipped with a piston inside the cylinder. The piston in the cylinder is then subject to a brake pedal acting through the push rod, the hydraulic cylinder is transmitted to the respective wheel brake cylinders points, also the hydraulic brake disposed in each wheel brake cylinder’s.
power system 3: Vacuum Booster
an electronic control system 4: the pump from ABS, ABS sensors, ABS computer components. .
5 execution system: a brake caliper, brakeCar pads, brake discs composition.
Type
Main brake system
cars are commonly used with a foot-operated brake when the, so called foot brakes (Foot Brake). The driver after the brake pedal is stepped by a mechanical or hydraulic brake device the braking forces to the wheels so that the rubbing action is generated.
The parking brake system
handbrake parking brake, also known as parking the car, the brake device of the vehicle to prevent coasting. Generally mounted on the intermediate transmission shaft braked, and direct control of the rear wheel brake two.
Anti-lock braking system
when the vehicle is traveling on a wet or icy road surface of low friction, if excessively brake occurs, the wheel brake is device lock and lose grip, the ability to control the direction of the vehicle lost cause. In order to make such a dangerous vehicle on the road surface can effectively control the forward direction, then developed ABSldquo; antilock brake system rdquo ;. Increasing performance of ABSldquo; rdquo ;, the anti-lock braking system capability also allows occasion TCS-Traction Control Systemldquo; Traction Control rdquo; and VSC-Vehicle Stability Controlldquo; vehicle stability control system rdquo; (equivalent to ESP) to control the tracking performance of the vehicle is traveling, and a control vehicle stability during cornering.
embodiment
by the brake means between the drum and the brake pads or friction disk, and when the process is converted into the friction momentum in the cars heat energy consumed. Common brake means has ldquo; drum brake rdquo; and ldquo; disc brake rdquo; two kinds of patterns, their basic features are as follows:
First, the drum brakes: [123 ]
mounted inside the wheel hub of the two semicircular brake pads, use ldquo; lever principle rdquo; push brakes so that the brakesThe inner surface of the drum and the sheet contact friction.
Second, the disk brake:
In the brake caliper brakes to control the two clamping the brake disc on the wheel. When the disk brake pad sandwiched between both of which cause friction.
When the car on a low friction road surface slippery or icy, if excessively brake occurs, the wheel brake means is locked and lose traction, resulting in loss of the ability to control the direction of the vehicle. In order to make such a dangerous vehicle on the road surface can effectively control the forward direction, then developed ABSldquo; antilock brake system rdquo ;.
increasing performance of ABSldquo; rdquo ;, the anti-lock braking system on the occasion capability also allows TCS-Traction Control Systemldquo; Traction Control rdquo; and VSC-Vehicle Stability Controlldquo; vehicle stability the control system rdquo; (equivalent to ESP) to control the tracking performance of the vehicle is traveling, and a control vehicle stability during cornering.
drum brakes in the automotive above has been nearly a century of history, but because of its reliability, and a powerful braking force, so that the drum brakes today still configured (multi-use on many models in the rear ). By a hydraulic drum brake is the brake pad means to push it inside the brake drum, brake pad and the inner surface of the wheel with the rotational friction of the brake drum, the brake effect generated.
The inner surface of the drum brake is the brake drum brake device generating position of the braking torque. In the case of obtaining the same braking torque, the diameter of the brake drum brake drum brake device may be smaller than the disc brakes of many. So large vehicle truck used to obtain a powerful braking force, the device can only drum brakes in the limited space of the rim.
Drum brake mode of action:
Briefly, the brake pad drum brake is the use of a stationary internal drum brake, with a friction wheel to brake the rotation drum, generate a frictional force to brake the wheel rotational speed reduction.
When the brake pedal is depressed, urging the foot brake master cylinder willThe piston and to push forward brake oil pressure generated in the oil passage. Pressure is transmitted via the brake fluid to the wheel brake cylinder of each piston, the piston brake wheel cylinder brake pad and then push outwards, the inner surface of the brake pads and the brake drum friction and generate sufficient friction to reduce the rotational speed of the wheel, in order to achieve the purpose of the brakes.
The drum brake advantages:
a brake with automatic tightening action, so that the braking system may use a lower hydraulic pressure than the diameter or the brakes many small dish brake drum.
2. easy to install the parking brake mechanism. Some models rear disc brake device, installed hand brake drum brake mechanism in the center of the brake disc.
3 parts of the process and composition of relatively simple, but have relatively low manufacturing costs.
Drum brakes disadvantages:
1 brake drum brake drum diameter increases when heated, causing increased stroke of the brake pedal readily react as expected for brake. Therefore, the use of the vehicle while driving drum brakes, to avoid causing continuous brake brake pads due to high temperature thermal phenomena recession.
2. The brake system response is slow, the depression force of the brake more difficult to control, is not conducive to a high frequency of braking action to do.
3. The multi-part structure is complicated, brake clearance adjustment to be done, so that maintenance is not easy.
As the performance and the traveling speed of the vehicle and the date of the dramatic increase in order to increase the stability of the vehicle brake at high speeds, the disc brake has become the mainstream of the current braking system. Since the disc brake brake disc exposed to air, so that the disc brake has excellent heat dissipation properties, made when the vehicle brakes or multiple brakes at high speed in a short time, the performance of braking is less likely to decline, so that the vehicle can be obtained better braking effect, to enhance the safety of the vehicle.
and because of the rapid reaction of the disc brake, the brake operation capable of doing high frequencies, many cars use disc brake system with the ABS and VSC, TCS with other systems, such systems needs to meet the rapid do moving needs.
disc brake mode of action:
As the name implies, a stationary brake disc brakeDisc, with the rotation of the tire sandwiching the brake disc to generate a frictional force, the rotational speed of the wheel brake is low.
When the brake pedal, the piston is pushed in the brake master cylinder, the brake pressure is established in the oil passage. Brake fluid pressure is transmitted via the brake wheel cylinder to the brake caliper pistons, brake wheel cylinder after the piston under pressure moves outward and pushes the brake pads to clamp the brake disc, brake pads and the brake disc so that the friction to reduce wheel speed, so the car slow down or stop.
disc brake advantages:
1 disc brake drum brake good heat dissipation properties than in the comparative continuous depressing the brake without causing the brake recession brake failure phenomenon.
2. After the brakes are not heated so that changing the size of the brakes pedal stroke increases.
3. Rapid reaction disc brake system, the braking action can do a high frequency, and thus meet the needs of more ABS system.
4. The disc brake of evil-tightening effect is not automatically brake drum, thus braking forces more evenly around the wheel.
5. Brakes preferred because of drainage, the case can be reduced because water or sediment adversely brake.
6 lower compared with drum brakes, disc brakes simple structure, and easy maintenance.
drawbacks
disc brake of:
1-tightening effect because there is no automatic evil drum brake, braking force that the brake disc is lower than the drum brake .
2. The disc brake friction area between the brake pads and the brake drum brakes relatively small, so that the braking force is relatively small.
3. To improve the drawback of the above disc brakes, and therefore needs more pedaling force or hydraulic pressure. Necessitating a larger diameter brake discs or increase the hydraulic braking system, the braking power to increase.
4. The parking brake apparatus easy to install, to use some of the rear disc brake models provided for this purpose plus a set of drum brake of the parking brake mechanism.
5. Greater wear of the brake pads, causing the frequency of replacement may be higher.