The Overall Design And Dynamic Performance Research Of The Inner Axle Box Bogie Of Rapid-speed Wagon

Railway transportation has always been one of the important transportation modes of various countries.As of the end of 2018,China’s railway operating mileage exceeded 131,000 kilometers,of which the high-speed rail mileage was nearly 30,000 kilometers,ranking first in the world.With the large-scale operation of high-speed railways,higher requirements have been placed on cargo transportation.Since 2000,China has developed a variety of express trucks to improve transportation efficiency and reduce transportation costs,creating conditions for large-area express freight transportation.As an important part of railway vehicles,the bogies’ structure and performance directly restrict the running performance of rail vehicles.As a new type of bogie,the inner axle box bogie has the characteristics of low noise,low wear and high running performance while reducing the weight of the bogie,which can greatly improve the running performance of the vehicle and increase the transportation capacity of the railway system for fast cargo.Based on this background,this paper designs a non-powered bogie for the inner axlebox of express freight cars that meets the requirements of 160km/h operation.In this process,the following work was mainly completed:(1)Study the structural characteristics of express truck bogies and inner axle box bogies at home and abroad,and determine the design scheme of 160 km / h express truck inner axle box bogies.Box,cross brace,primary suspension device,secondary suspension device,basic braking device and other components were subjected to structural design and parameter research to obtain a three-dimensional bogie model;(2)According to the principle of vehicle system dynamics modeling,a vehicle system dynamics model with an inner axle box non-powered bogie is established;a two-dimensional mechanical model of the vehicle system is established to perform force analysis and motion analysis In order to establish the vertical and lateral equations of motion of the car body,bolster,frame and wheelset;(3)The effects of primary steel spring vertical stiffness,primary vertical damper damping,primary arm transverse stiffness,primary arm longitudinal stiffness,cross support device stiffness,secondary rubber pile horizontal stiffness,secondary lateral damper damping,traction rod longitudinal stiffness and side bearing preload on vehicle dynamic performance are analyzed and studied by using single variable test method And optimize the above parameters to get a better set of bogie suspension parameters;(4)Using the optimized suspension parameters to evaluate the running stability,curve passing and running stability of freight cars,the results show that freight cars equipped with inner axle box non power bogie have good dynamic performance.