comprises a steel brake line and a flexible hose connected together by joint action of the brake fluid from the master cylinder is transmitted to obtain the individual wheel brakes. Line leak the brake system failure, therefore, the brake line is very important system components, care must be inspected and maintained.
1. Composition brake line
brake pipe fixing device, which consists of a tube integrally fixed hanging, hanging down tube, the tube hanging on the lower end face and hanging the tube upper end surface having a corresponding longitudinal groove, said lower pipes hanging corresponding longitudinal grooves constitute the longitudinal channels receiving the brake pipe disposed therein. The present invention reduces the original brake line connection, the train pipe, duct total life with duct, the air duct springs, blowing dust tube, brake duct sufficiently long stainless steel tube used as much as possible assembly as a whole, and the overall vehicle body is connected, to achieve a modular brake line tube banks, so that assembly, testing and field installation brake line separation, and shorten the duration of the on-site installation, and the entire vehicle under layout is simple, smooth lines, visual appearance, and safety performance greatly enhanced.
comprises a main air compressor drivingMotivation, an air compressor, an air dryer, the pressure controller. An air compressor with a modular design, hanging in the lower portion of the vehicle chassis. Air Compressor of Guangzhou Metro Line A vehicle mounted on vehicles (trailers) lower part, while the Guangzhou Metro Line and the Shanghai subway, air compressor second line of the vehicle are installed in c car (EMU) lower part. Train consists of two units having two sets of gas supply systems, in order to reduce the wear of the compressor, the air compressor at the front portion of the train unit to always supply the whole train, without also using the two-compressor unit. Trailer piping system with air compressor, the grouping of its motor car, in addition to the pneumatic system, other than by the pantograph line, as another line of the trailer. On each vehicle in the system has four air cylinder, wherein the air cylinder includes a total of 250L. A 100L air suspension system (air spring) air cylinder, an air cylinder brake 50L and 50L of a passenger compartment door pneumatic air cylinder. Also fitted with a single regeneration tower drier air cylinder is also attached to a 50L. .
2 modified brake line
Brake pipe routing of two parts: a part of the vehicle from the master cylinder to the bottom part, which is usually copper pipe, because of the high strength brass, less deformed, it is generally not a problem; the other is the bottom portion of the vehicle brake cylinder, this part is made of soft rubber tube connected to the suspension with the tire It stretches. Since the rubber itself is resilient to withstand the hydraulic pressure of the braking system will produce deformed, causing changes in diameter, to reduce the effect of brake oil transmitted to hydraulic pressure, the brake cylinder can not produce stable braking force. Such a situation will brake system with age and severeOperation exacerbated deformed, but the rubber with a long time there will be fatigue, which should be transmitted to the brake cylinder pressure because of expansion of the elastic line losses, the actual pressure transmitted to the brake plate L becomes small.
capable of withstanding a high pressure, high temperature metal tubing instead of the rubber hoses can solve the above problems. Such metallic tubing is not entirely metal, but the Teflon material, the metal sheath python conduit. This conduit provides excellent hydraulic transmission effect, so that hydraulic pressure coming from the master cylinder can be fully used to drive the piston cylinder to provide stable braking force. In addition, the metal material also has characteristics not easily damaged, can significantly reduce the probability of pipeline damage caused Zhidongshiling.
3. Characteristics of the brake line
of the wheel cylinder pressure change
in the braking process by adjusting the pressure in the brake line changes, pressure changes in the conduit due to the inevitable fluid volume changes (change of the flow rate). The main treatment employed in the mathematical model of the liquid is whole brake line as a whole, does not consider the effect of liquid viscosity, pressure and flow rate, etc. that everywhere the same throughout the physical line. And using the wheel cylinder pressure change at the brake piston motion and force as the system boundary conditions to establish a set of corresponding differential equation. System variables variation with time, you can master the dynamic characteristics of the system by properly solving differential equations is obtained.
Besides, during the hydraulic line dynamic characteristic analysis, often used in the fashion of an analog circuit, lumped parameter model is referred to as a model. Lumped parameter model can be easily and flexibly analyzing a fluid piping system, but moreCoarse, generally used for shorter lines, where low frequency pulsations. For the braking system, this method has been able to meet the requirements study.