Axlebox built-in compact bogies for metro vehicles

Abstract

The invention discloses a compact type bogie with internally-arranged axle boxes for a subway vehicle and belongs to the field of bogies for subway vehicles. The compact type bogie comprises two driving devices, two braking devices, two wheel pair devices, a compact type cast framework, a compact type secondary suspension system and two wheel pair internally-arranged type axle box devices. The wheel pair devices comprise axles and wheels symmetrically arranged at the two ends of the axles, the driving devices comprise traction motors and gear boxes, and each braking device comprises two wheelpair brakes. The fixed axle distance of the bogie is reduced substantially while structural strength is guaranteed, the yaw angle rigidity of wheel pairs and the warping rigidity of the bogie are reduced effectively, accordingly the gyration radius of the bogie is decreased, the small-radius curve passing capacity of the bogie is improved, the transverse damping requirement and the anti-collisionrequirement on a curve bend can be met completely, and the occupied space of an original transverse buffer stopping seat is saved.

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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