Bogie design of the hottest B-type urban rail tran

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Type B urban rail transit vehicle bogie design

Abstract: the three-dimensional assembly design of type B urban rail transit vehicle bogie is carried out for the first time by using i2D EAS software. The main structural design features of the bogie and the optimal selection of dynamic performance parameters are described

key words: urban rail transit; Light rail vehicles; Bogie; Design; Parameters; Optimization

1 overview

urban rail transit is safe, fast, punctual, efficient, energy-saving, pollution-free and covers less land, which can meet the practical requirements of urban development and environmental protection. Developing urban rail transit is the fundamental way to solve the problem of urban public transport, and it is also the inevitable choice of urban sustainable development strategy. Modern rapid urban rail transit system adopts fully closed lanes, automatic signal control and dispatching system and light fast EMUs. The traffic density is large. The average travel speed of H ~ 40 km is generally 30 km/h, the maximum running speed of H ~ 90 km is 80 km/h, and the maximum passenger carrying capacity in one direction can reach 60000 ~ 80000 people H. There are three key technologies in urban rail transit vehicles: VVV f frequency modulation and voltage regulation AC drive and control technology; Lightweight car body technology; Lightweight, high performance and high reliability Bogie Technology

the types of modern urban rail transit vehicles can generally be divided into type A, type B, type C and low floor light rail vehicles. Among them, low floor light rail vehicles can be divided into 70% low floor and 100% low floor. At present, most of the large and medium-sized cities that have the practical needs and economic strength to develop urban rail transit at the same time are large and medium-sized cities with large passenger flow. The mainstream of the development of their rapid rail transit system is the three-dimensional operation of EMUs based on type A or type B vehicles with basic marshalling units of 2m + 1t or 1m + 1t. The whole rail transit system is developing in the direction of three-dimensional and networking of subway, elevated light rail and suburban ground. The B-type vehicle with VVV f AC transmission technology and lightweight weather resistant steel or stainless steel body can meet the development requirements of some urban rail transit systems in China, and has a certain degree of technical economy. Its running gear is a lightweight, low-noise bolster free bogie

2 bogie type selection analysis

2 1. Special requirements for bogies in urban rail transit

compared with trunk railways, urban rail transit has the following characteristics:

(1) short spacing, frequent start and stop, and high requirements for traction and braking performance

(2) small curve radius and high requirements for running part

(3) the line slope is large, up to 30 ‰ ~ 60 ‰

(4) the load is from 1816 t (310 people) to 26 t (432 people), and the weight difference between empty and loaded vehicles is large

(5) the traffic density is large, and the shortest driving interval can reach 115 min ~ 2 min, with a high degree of automatic control

(6) the operation environment is special, and the requirements for safety and reliability are extremely high

(7) strict requirements on noise

(8) it needs to meet the overall style of the city and the aesthetic requirements of residents, and the vehicle shape and color requirements are very creative

sufficient attention must be paid to the running stability, lightweight, low noise, high reliability, easy maintenance and special operating environment of the bogie. Bogie is very important to the running performance and driving safety of vehicles, and has a significant impact on the economy of rail transit system

2. 2 characteristics of existing domestic bogies

at present, there are two kinds of bogies for domestic metro and light rail electric passenger cars, in addition to domestic ones, which are imported from foreign technologies: one is the bogies for Shanghai Metro Line 1, line 2 and Guangzhou Metro Line 1, which are imported from Europe; The other is the bogie for Beijing Fuba line subway, which is a product developed and produced for the introduction of South Korea Hanjin heavy industry technology. Among them, the metro vehicles of Shanghai line 2 are also used in the Pearl line, the first elevated light rail in China. For the convenience of analysis and comparison, the main technical characteristics and parameters of various bogies are listed in Table 1. Table 1 main technical features and parameters of existing metro and light rail bogies

note: the bogie for Shanghai Metro Line 1 is rubber elastic coupling

2 3. Development direction of bogie

looking at the situation at home and abroad, the development trend of the running gear of type A or type B urban rail transit vehicles is the lightweight and low-noise Bolsterless bogie. The primary suspension is rubber spring, the secondary suspension is the combination of air spring and anti roll torsion bar, the traction motor is horizontally suspended, and the unit foundation braking device is adopted. The line conditions and running characteristics of urban rail transit vehicles are very different from those of trunk railway vehicles. For example, the structural design space of bogie is very harsh; Adopting AC transmission technology, the gear transmission ratio is very high; The comprehensive effect of high passenger capacity brings great challenges to the design of urban rail transit vehicle bogie, special operating environment, high requirements for safety and reliability, and so on. These are due to special difficulties

3 overall design requirements and main technical parameters of bogie

3 1. Overall design requirements of bogie

(1) the comprehensive performance of bogie shall meet the specified gauge and line conditions, and can meet the application requirements of subway, elevated line and suburban ground high-capacity, fast urban rail transit system

(2) the bogie has appropriate running stability and good curve passing capacity

(3) the running stability index shall be implemented in accordance with gb5599-1985 code for dynamic performance evaluation and test evaluation of railway vehicles: under any load condition between no-load and full load and various operating speeds, the vertical and horizontal stability index of the vehicle is less than or equal to 215, and the performance is stable

(4) the safety index of bogie shall be implemented in accordance with gb5599-1985 code for dynamic performance evaluation and test evaluation of railway vehicles: derailment coefficient q? P ≤1. 0 Wheel load reduction rate? P ? P ≤016; Overturning coefficient D ≤ 018

(5) the static strength and dynamic strength of key components of bogie meet the requirements of relevant international standards or tb1335-1996 code for strength design and test appraisal of railway vehicles

(6) take appropriate lightweight measures, and the total weight of the bogie is about 415t (excluding the driving device)

(7) high reliability, take safety measures for possible faults. In short,

(8) good maintainability

3. 2. Main technical parameters of bogie

4. Main structural design features of bogie

b-type urban rail transit vehicle bogie is a lightweight, low-noise, bolster free bogie. The axle box spring is a non wearing conical laminated rubber spring, which adopts an H-shaped steel plate profiled welded frame, and the central suspension greatly reduces the cost of the modified special material. It is a three no structure in which the air spring directly supports the car body. It adopts a unit type single-sided brake shoe tread braking device, and the traction motor is horizontally suspended. Bogie is divided into motor car bogie (Figure 1) and trailer bogie (Figure 2). An AC traction motor, gear box and coupling are installed on each axle of the motor car bogie. Compared with the trailer bogie, except for the different characteristic parameters of the axle box spring, other parts and components of the motor car bogie can be completely interchangeable

Figure 1 assembly drawing of motor car bogie

Figure 2 assembly drawing of trailer bogie

i2dea s software is used for the first time to directly carry out three-dimensional assembly design of bogie. The three-dimensional modeling design of the frame and axle box laid the foundation for the subsequent finite element strength calculation. The accurate mass, moment of inertia, center of gravity and position of main inertia axis of all parts are calculated. The displacement of our spring testing machine is tested in strict accordance with Japanese standards, which provides reliable basic data for the dynamic performance calculation of bogie

4. 1 wheel set axle box positioning device

the wheel set axle box positioning device adopts conical laminated rubber spring (Fig. 3). The advantage of rubber spring is that it has nonlinear stiffness characteristics, and has the function of isolating high-frequency vibration and reducing wheel rail noise. Optimize the parameters of the three-way spring, and pay attention to improving the curve passing capacity of the bogie on the premise of obtaining the appropriate hunting stability of the bogie and the repeatability of the environmental conditions provided by the environmental experimental equipment, which are verified by the national metrological verification department according to the verification regulations formulated by the national technical supervision organization to meet the requirements of transmitting braking force and traction force. An adjusting gasket is set between the axle box spring and the axle box to facilitate the landing adjustment. Safety rings are set between the axle box cover and the frame

Fig. 3 assembly drawing of axle box spring of wheel set

h SD wheel of current Chinese standard is adopted, and the diameter of wheel rolling circle is

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