Rigidity-variable positioning device for bogie axle box of railway vehicle

Abstract

A rigidity-variable positioning device for a bogie axle box of a railway vehicle comprises a vertical elastomer and longitudinal elastomers. The vertical elastomer is arranged between the top face of an axle box bearing saddle and the bottom face of a side-rack guide frame. The longitudinal elastomers are arranged between the axle box bearing saddle and the front lateral side as well as the back lateral side of the side-rack guide frame respectively. Each longitudinal elastomer at least comprises a low-rigidity elastic element and a high-rigidity elastic element. The low-rigidity elastic elements are arranged in elastomer pre-compressing devices and are connected with the large-rigidity elastic elements in series under the action of pre-compressing loads F1. The longitudinal elastomers have large longitudinal compression rigidity on the condition of small longitudinal deformation and displacement quantity, and can ensure the railway vehicle to have a high snakelike critical speed during linear running to meet the need of accelerated running of the vehicle; the longitudinal rigidity of the longitudinal elastomers starts to decrease on the condition that the longitudinal deformation and displacement quantity reaches a preset level, so that proper horizontal force between wheel tracks when the railway vehicle runs on curved tracks can be guaranteed, and further, safety in curve running of the vehicle is guaranteed.

Description

technical field [0001] The invention relates to the design and manufacturing technology of a railway vehicle bogie, in particular to a variable stiffness positioning device for a railway vehicle bogie axle box. Background technique [0002] A railway vehicle is a special vehicle running on a specially designed track, which can guide itself without controlling the direction when running along the specially designed track. The bogie is one of the most important components on a railway vehicle, it supports the weight of the entire cargo and the weight of the car body itself. Traditional bogies are mostly three-piece structures consisting of two side frames and a bolster. The pedestal frame at both ends of the side frame is installed on the front and rear wheel sets through the axle box bearing saddle and bearing device, and the bolster is composed of The two ends of the car are installed in the central box formed by the side frames through two sets of central spring suspension...

AI Technical Summary

Problems solved by technology

[0006] At present, improving the critical running speed of the vehicle on a straight line and improving the passing performance of the vehicle on a curve are a pair of contradictions, and it is difficult to give consideration to each other in the specific design of the elastic suspension device of the vehicle bogie axle box

This is because the existing two main axlebox elastic suspension devices cannot meet the above requirements at the same time: one is a vertical elastic device arranged between the top surface of the axlebox bearing saddle and the bottom surface of the side frame pedestal. It has a certain effect on the vertical vibration reduction of the bogie, but there is a rigid hard contact between the axle box saddle and the side of the side frame pedestal without any buffer device, not only has a relatively low effect on the lateral vibration and longitudinal vibration of the bogie Poor, and the structural design is relatively complex, parameter matching is very difficult, assembly versatility is poor, and it cannot take into account the critical running speed of the vehicle on a straight line and the passing performance requirements of the vehicle on a curve when speeding up and heavy load

The other is to provide not only vertical elastic devices, but also longitudinal elastic devices between the axle box saddle and the side frame pedestal, which makes it easier to achieve vibration reduction and control of the longitudinal impact of the bogie, but Since the stiffness of the front and rear longitudinal elastic devices is fixed, limited by this structural form, the load on the bogie increases linearly or proportionally with the increase of its displacement, which still cannot fully take into account the The critical operating speed of snaking on the straight line and the passing performance requirements of the vehicle on the curve also have the risk of train derailment, which greatly reduces the effect of the elastic suspension device of the axle box

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