Double-layer train carriage

Abstract

An embodiment of the invention provides a double-layer train carriage. The carriage comprises a roof, a bottom frame and a carriage space defined by side wall structures, wherein the carriage space isdivided into an upper carriage and a lower carriage by floor structures; each side wall structure comprises a roof connecting section for primary fixed connection, a load bearing section and a bottomframe linking section; each load bearing section comprises a switching structure for mounting and fixing the floor structure of the upper carriage. According to the technical scheme, adjustment transition is performed by the switching structure, the problem of fit tolerance accumulation caused in the side wall mounting process is solved, so that the floor structures of the two carriages can be fixedly connected with side walls smoothly, and meanwhile, local effects of local stress problems or welding processes in the direction connection process of the floor structures and the side walls on strength of the side walls are avoided.

Description

technical field [0001] The present application relates to rail transit technology, in particular to a double-decker train carriage. Background technique [0002] More and more passengers choose to travel by high-speed trains due to their good safety performance, high comfort, high speed and reasonable price. [0003] In order to improve the passenger carrying capacity of railway passenger moving train units and rationally utilize the space inside the train, double-deck EMU trains have gradually become one of the directions of train design. For trains, side walls are an important part of high-speed EMU trains. The side walls are mainly welded by hollow long and large profiles. The side walls are divided into one and two side walls, which are assembled with the roof, underframe, and end walls to form a car body. The existing side wall structure is welded by 6 long and large beams. However, the tolerance requirements for the large parts of the car body are strict, and the acc...

AI Technical Summary

Problems solved by technology

The existing side wall structure is welded by 6 long and large beams. However, the tolerance requirements for the large parts of the car body are strict, and the accumulation of tolerances is often reflected in the interface position, that is, the connection between the side wall edge beam and the second floor If the gap is too large or too small, it will greatly affect the connection between the floor and the side wall. If the cumulative tolerance is too large, the second floor may not be installed normally.

At the same time, due to the thick profile wall of the upper floor of the carriage, the heat input during the welding process is large, which can easily cause wave deformation of the floor after welding, and the flatness is seriously out of tolerance

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