Light aluminum alloy chassis of light rail vehicle body

Abstract

The invention discloses a light aluminum alloy chassis of a light rail vehicle body which comprises a transverse beam and a longitudinal beam and further comprises a splicing piece and a fastening piece, the splicing piece is provided with a transverse clamping groove and a longitudinal clamping groove, the longitudinal beam is inserted into the longitudinal clamping groove, the end of the cross beam is inserted into the transverse clamping groove, and the splicing piece is connected with a floor of the vehicle body in a fastened mode through the fastening piece. The cross beam, the longitudinal beam and the splicing piece are made of aluminum alloy materials. The cross beam and the longitudinal beam are restrained through the inner walls of the transverse clamping groove and the inner walls of the longitudinal clamping groove, compared with welding in the prior art, a certain relative movement range can exist between the traverse beam and the longitudinal beam instead of rigid connection, the situation that the connecting positions are cracked due to repeated stretching and compression is avoided, and the structural strength of the bottom frame is improved; and the train is saferin the running process.

Description

technical field [0001] The invention relates to the technical field of light rail, in particular to a light-weight aluminum alloy underframe for a light rail vehicle body. Background technique [0002] Light rail is an important form of urban rail construction, and it is also the fastest-growing rail transit form in the world today. The locomotive weight and passenger capacity of light rail are smaller than that of ordinary trains, and the rails used are light in weight, so they are called "light rail". [0003] The light rail car body in the prior art usually includes a top plate, two side plates, a floor and an underframe, wherein the top plate, two side plates and the floor are fixedly connected end to end to form a box structure of the car body, and the underframe is fixedly connected to the lower surface of the floor. It is used to support and fix the bottom plate, and the wheels and shock absorbing devices are directly or indirectly connected to the bottom frame. [...

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Problems solved by technology

[0005] However, the underframe of the light rail car body in the prior art has the following defects: the longitudinal beam and the cross beam are usually made of steel with a square tube structure, and the longitudinal beam and the cross beam are welded and fixed. During use, due to the high brittleness of the weld , after long-term repeated stretching and compression, it is easy to cause weld cracking. Once too many welds between beams and longitudinal beams crack, the structural strength of the chassis will decrease as a whole, resulting in a decrease in the stability of the car body, and eventually Reduce the safety and comfort of the light rail; in the prior art, there is a method of welding and then using bolts for reinforcement, but this reduces the assembly efficiency and increases the workload of maintenance

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