Monday, June 6, 2011

The brake system of the car. From theory to practice.

The usual process of inhibition occurs when you press the brake pedal and the consequent blocking of wheels. But if you ignore the brake system and disable the engine from the driving wheels in motion, the car will move by inertia long enough time. Stopping the car will come under the influence of forces of resistance that will reduce speed to a complete stop traffic. Because Stopping the car in this way will not be soon enough, the more efficient method adopted forced braking, which provides a braking system. It's about the braking system, its construction and operation will be discussed in this article. Theoretical part: Brake force arises between the wheel and the road, when the brake mechanism prevents further rotation of the wheel. Because braking force is directly opposed to the motion of the vehicle at its maximum value affects the degree of adhesion to the road and the vertical reaction Rz, acting on the road to the wheel. This formula is as follows: Pt max = YR (Y-coefficient of grip). Thus, the friction coefficient directly affects the braking force. Proceeding from this we can conclude that on a dry road friction coefficient is much higher (Y = 0,8), than in the wet, rain (Y = 0,5). Rolling wheel is the best grip. Because if it slides and locks. The coefficient of adhesion is reduced by 20-30%. This leads to the conclusion that to achieve maximum efficiency is better to keep the wheel on the verge of blocking or use all the known system of ABS From theory to practice: the brake system is quite simple and well known to many. The driver presses the brake pedal, the force is transferred through a number of devices on the brakes, which are pressed against the brake discs to brake pads, whereby the slowing rotation of the wheel and should stop the rotation completely. The car has 3 brake systems: operating, reserve and parking. The most in demand, you guessed it - working. Basically, it consists of brakes (disc, drum or other), brake master cylinder, vacuum or (or other) power brakes and Brake Force. Just be sure to mention the brake fluid and the contours (for the hydraulic system). Detailing: Wheel Brakes: The most famous - it's belt, shoe and disc brakes. We will sharpen its focus on the disc brake system. Mechanism itself is located in the deepening of the wheel rim. Disc brake mechanism provides fixed and floating bracket. When using a fixed bracket shell firmly connected to the backbone. The housing bracket located on both sides of the piston 2, which presses the brake pads to the brake disk, creating a braking process. Staples floating brake distinguish the steering and the so-called Mark II. In both cases one or more pistons act on the inner brake shoe and movable housing bracket presses the second. Advantage of this brake system include small size space between the brake disc and wheel arch. This type of slides suitable for suspension with low or negative values ??shoulder running. Brake Force. Brake Force, or the common people "sorcerer", looks like a normal valve - control open communication. Its mission is to regulate the relations of braking forces between the axles. There are valves are static, they limit the braking force. There is - the dynamic that works with the pressure in the brake actuator, the axial load and deceleration. Amplifier, a hydraulic actuator. His important task is to facilitate the work of the driver. It attracts additional sources of energy - compressed air (booster), intake depression (booster) and the energy of the fluid pressure (hydraulic). The most commonly used vacuum brake booster due to its low price and simple design. Refinement of the braking system: Finalization can do easy, which is enough to replace the pads, discs and drums (if any) on the Bole quality. Booster can be replaced by a more progressive, whereby the result of pressing the brake pedal is more efficient. Serious improvements involve the installation of front ventilated 15-x brake discs, which requires the installation of wheel rims for R15, replace rear drum brakes on the 13th disc. After this procedure, braking efficiency is much higher due to high energy at high temperatures. But there is a significant disadvantage, since such improvements and enhance brake torque, the wheels are blocked before, and at the turn of the machine can break into a skid. To avoid such situations you should use a divisor of the brakes, which thanks to the efforts between the front and rear axles are evenly distributed. If you install a rear disc brake system must be replaced, the drive "parking brake" on the hydraulic. And on this list does not end there.

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