Optimal design method of motor car group wheel tread

Abstract

The invention provides an optimal design method of a motor car group wheel tread, and belongs to the technical field of the high-speed vehicle of a railway. The optimal design method can effectively solve the problem that the original wheel tread of a CRH3 (China Railway High-Speed) type motor car group has a poor adaptive capability on the profile shape change of a steel rail. The optimal design method comprises the following steps: firstly, the profile shape of a common working area of the wheel tread is selected to be optimized so as to cause the wheel tread to basically coincide with an original wheel tread; secondly, in order to lower the throat root circle inclination of the wheel tread, the optimized rim thickness d8 of the wheel tread is determined to be 32.5mm to adapt to a situation that no overlarge equivalent conicity is always generated when the wheel tread is matched with the unpolished steel rail of which the rail shoulder is extruded, and the capability of the wheel tread on adapting to the unpolished steel rail is improved; and thirdly, the inclination of the outer end of the wheel tread is improved, the optimized inclination of the straight-line segment CD of the outer end of the wheel tread is determined as 1:20 so as to adapt to a situation that the too small equivalent conicity is unlikely to generated when the wheel tread is matched with the excessively polished steel rail, and the capability of the wheel tread on adapting to the excessively polished steel rail is improved. The optimal design method is mainly used for producing the CRH3 type motor car group wheel.

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

Images