Heavy-load fast railway freight car bogie with mechanically suspended type secondary suspension device and stiffness calculation method

Abstract

The invention relates to a heavy-load fast railway freight car bogie with a mechanically suspended type secondary suspension device, and belongs to the technical field of design and manufacturing of railway vehicles. The heavy-load fast railway freight car bogie aims to ensure that a vehicle has good running stability, curve passability and an anti-snake-shape ability during linear and curved running, and to effectively reduce wheel-rail wear and operation and maintenance costs. The mechanically suspended type secondary suspension device is composed of a positive stiffness unit and a negativestiffness unit; the positive stiffness unit provides vertical, longitudinal and transverse stiffness for traditional secondary suspension springs; and the negative stiffness unit is composed of a horizontal spring, a vertical guide rod, rolling shaft rods, bearings, sliding block sliding rails, a linear bearing and the like, the unit mechanism can maintain free sliding in longitudinal and transverse directions, and only provides the vertical negative stiffness characteristic, and the negative stiffness unit mechanism is in spherical hinge connection with a vehicle body so as to ensure that thevehicle body has six degrees of freedom of extending and retracting, transverse moving, ascending and descending, lateral rolling, diving and swinging. Better vibration isolation performance is achieved, and the mechanically suspended type bogie can improve vertical stationarity of vehicle linear running to a great extent and improve transverse stationarity of vehicle running.

Description

technical field [0001] The invention relates to a heavy-duty express railway freight car bogie (abbreviated as a mechanical suspension bogie) with a mechanical suspension secondary suspension device, which belongs to the technical field of rail vehicle design and manufacture. Background technique [0002] The bogie design of heavy-duty express railway freight cars is the key core technology to realize the leap-forward development of railway freight. Although my country's high-speed rail technology has made great progress and transportation has developed rapidly, due to the high cost of high-speed rail construction and operation and maintenance, it is difficult to be widely used in the whole country. Carry out high-speed rail cargo transportation within the scope, even if it is carried out, it is only applicable to the transportation of small pieces or high value-added commodities. Ordinary line transportation has the advantages of low construction, operation and maintenance c...

AI Technical Summary

Problems solved by technology

[0003] Although my country has mastered the key core technologies such as bogies, traction and braking of ordinary line trucks, due to the limitation of the existing ordinary line level conditions and the influence of the stiffness of the vehicle's secondary suspension, it is difficult for a fast-moving vehicle to operate in a complex vibration environment. It still maintains low dynamic characteristics, which will cause the vehicle system to be subjected to increased wheel-rail force and snaking motion caused by track irregularities, and severe wheel-rail wear, which will not only damage the railway track, but also deteriorate the dynamic performance of the train

At the same time, the increase of the axle load of the bogie will lead to aggravated wheel-rail wear and increase operation and maintenance costs; and changing the wheel-rail contact relationship will have a great impact on the stability and safety of the train operation and the service life of each component of the system

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