A tread optimization design method for EMU wheels

Abstract

The invention provides a tread optimization design method for a wheel of an EMU, and belongs to the technical field of railway high-speed vehicle bogies. It can effectively solve the problem that the original wheel treads of the CRH3 EMU have poor adaptability to changes in the rail profile. First of all, the profile of the common working area of ​​the optimized wheel tread is selected to basically coincide with the original wheel tread; second, in order to reduce the round slope of the throat root of the wheel tread, the rim thickness d8 of the optimized wheel tread is determined to be 32.5 mm to accommodate When it is matched with unpolished steel rails with protruding rail shoulders, it is not easy to produce excessive equivalent taper, which improves the adaptability of wheel treads to unpolished steel rails. Thirdly, the slope of the outer end of the wheel tread is increased, so the slope of the straight section CD of the outer end of the optimized wheel tread is determined to be 1:20, so that it is not easy to produce too small an equivalent taper when it is matched with an excessively polished steel rail , which improves the adaptability of the wheel treads to over-grinding rails. It is mainly used for the production of CRH3 EMU wheels.

Description

technical field [0001] The invention belongs to the technical field of railway high-speed vehicle bogies, in particular to the optimal design of wheel treads of CRH3 type bogies. Background technique [0002] The wheel-rail contact relationship of high-speed railways, especially the equivalent taper of the wheel tread, has a great influence on the dynamic performance of railway vehicles: when the equivalent taper of the wheel tread is too large, the vehicle is prone to secondary snaking instability, and when the equivalent taper of the wheel tread If it is too small, the vehicle is prone to a snaking instability. On the one hand, the snaking instability of the vehicle poses a threat to driving safety, and on the other hand, it seriously affects the ride comfort. [0003] The equivalent taper has a great relationship with the position distribution of the wheel-rail contact point: when the wheel-rail contact point is distributed to the root of the rim, it is easy to produce a...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for optimal design of the tread surface of the EMU wheel, which can effectively solve the problem that the original wheel tread of the CRH3 type EMU has poor adaptability to changes in the rail profile

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