Axlebox built-in compact bogies for metro vehicles

Abstract

The compact bogie with built-in axle box for subway vehicles belongs to the field of bogie devices for rail vehicles. It includes two sets of driving devices, two sets of braking devices, two sets of wheel set devices, compact casting frame, compact The second-series suspension system and two sets of wheel-set built-in axle box devices include the axle and wheels symmetrically arranged at both ends. The driving device includes a traction motor and a gearbox, and the braking device includes two sets of wheel-set brakes. The invention greatly reduces the fixed wheelbase of the bogie while ensuring the structural strength, effectively reducing the oscillation angle stiffness of the wheel pair and the torsional stiffness of the bogie, thereby reducing the gyration radius of the bogie and improving its ability to pass small curves. It can fully meet the needs of lateral shock absorption and anti-collision on curves, and saves the space occupied by the old lateral buffer stop seat.

Description

technical field [0001] The invention belongs to the field of bogie devices for rail vehicles, and in particular relates to a compact bogie with built-in axle boxes for subway vehicles. Background technique [0002] The frame of the existing railway vehicle bogie is usually an axle box external bogie, such as Figure 1 to Figure 3 As shown, the common axle box external bogie is an approximately H-shaped welded frame formed by two beams 1 and two side beams 3. The basic structure of the frame includes two longitudinal beams 2, two beams 1 and the side beams 3 fixedly connected to the two ends of the beam 1, the six of which are jointly welded into a frame main structure approximately capital letter H, each beam 1 includes two seamless steel pipes 1-1, and a gear box hanger 1 -2. The motor suspension base 1-3 and a set of traction rod bases 1-4, the two seamless steel pipes 1-1 are parallel to each other, and the distance between them is bridged and fixed by two parallel longit...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing axle box external bogie with a central rectangular window is only suitable for rail vehicles such as EMUs with high structural strength, large overall mass, sufficient layout space for auxiliary equipment, and a large minimum curve radius, it has a frame center The H-shaped frame structure of the window requires a traditional Z-shaped frame built into the central rectangular window. The central window has a built-in traction rod and a fifth wheel, which leads to the need for two sets of outer anti-serpentine shock absorbers and anti-rolling torsion externally placed on the side beams. The rod seat is used in conjunction with the built-in traction rod in the center window of the traditional Z-shaped frame to eliminate the overturning vibration of the frame along the diagonal direction and the snaking torsion along the direction of travel. As a result, the large axle box of this type of frame must be placed on the outside of the wheel set As a result, the overall structure of the bogie takes up a large space, has a large radius of gyration, is heavy in weight, and has a high center of mass, and causes the minimum curve passing radius of this type of bogie to be at least 100 meters, and the wall thickness of the steel plate required for splicing and welding is at least The average weight of the overall bogie frame is about 1.6 tons, and the axial span of the two side beams is at least 1800 mm. These existing index parameters make the traditional frame with external axle boxes heavy, wide and minimum The curve radius cannot be further reduced and cannot meet the design requirements of new subway lines, and the fatigue strength of its welds will inevitably decline gradually over time, which may even lead to cracks in the key welds of the frame, which is not conducive to driving safety; and conventional axles The structure of the box is exposed at the outer end of the axle, resulting in a large horizontal span between the external axle box, which takes up a lot of space, and the structure is not compact enough; and the old H-shaped welded frame with the external axle box can only meet the impact load of 20g. The assessment parameters do not exceed 100% of the yield strength of the material. The traditional frame structure with external axle boxes makes it impossible to meet the design requirements of the new subway project in terms of strength, weight and minimum curve radius. The invention provides an axle box built-in compact bogie for subway vehicles

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