The axle box spring with fatigue damage of the product structure features the structure. The characteristics of the structure are as follows: the height of the three layers of rubber is basically equal, the thickness of the three layers of rubber is equal, and the rubber of the inner sleeve is the same as the shear bearing area or the bearing volume. The rubber sleeve and jacket should be greatly reduced. Therefore, although the load of each layer of rubber is the same, the stresses of the rubber are the same, which leads to the earliest damage of the inner rubber with the highest stress, and the jacket is still intact. . Schematic diagram of the axle box spring structure for the product structure, further analysis also shows that the product is first due to structural asymmetry after the vulcanization produces severe thermal stress concentration, in the actual use of the process under the vertical preload, the locomotive is provided by accelerated braking The longitudinal load causes the components to form severe areas of stress concentration that are exactly the same as the area where the product actually breaks. That is to say, the longitudinal load under thermal stress and vertical preload conditions is the critical load that causes the product to have different degrees of longitudinal cracks. Therefore, the composite bearing of the axle box spring in vulcanization thermal stress, vertical preload and longitudinal load Due to the unreasonable structural design, the product inner sleeve is prematurely experiencing severe fatigue cracks, which is the cause of fatigue damage of the product. The equal stress design concept is to improve the fatigue life of the structure, combined with the structural bearing characteristics, the structural design should make the rubber of each layer have no obvious stress concentration, the maximum stress strain of each layer of rubber is almost equal, and the maximum stress strain of each layer is compared with the original. The inner rubber of the structure must have a large reduction, which is the design idea and design concept of equal stress. For the axle box spring structure, in order to make the structure have an equal stress distribution, the structural dimensions R1, L1 should satisfy the formula (1), and the stress σ1 is controlled within the allowable range of the fatigue life. (1)3 Structural optimization based on equal stress For the axle box spring, the factors affecting the fatigue life of the product, from the structural point of view, the three layers of rubber are unevenly loaded, the inner rubber bearing is too large, and the inner rubber is damaged in advance. Therefore, the main work of product structure improvement is to make the stress of each layer of rubber as basic as possible, and the stress distribution of the three layers of rubber is basically equal. Based on this, according to formula (1), we design a structure based on equal stress. Based on the equal stress structure, the improved structure based on equal stress still uses a three-layer rubber-metal composite structure, but according to the bearing stress of the rubber, the initial diameter of the inner rubber is increased to increase the bearing area of ​​the rubber; the new structural design ensures the thickness direction. From the inside to the outside, the thickness difference of the rubber becomes smaller, and the height of the rubber in the height direction changes from high to low, that is, the relationship between the radius of the rubber and the height is controlled by the formula (1), and finally the relationship shown is formed. Therefore, based on the improved structure of this equal stress design concept, each layer of the product can have the same fatigue life. The product based on the relationship between the radius and height of the rubber layer under the equal stress improves the structure through further finite element analysis. It shows that the stress distribution and strain distribution state of the product during vulcanization, vertical bearing and longitudinal load are optimized. Compared with the structure, there is a large degree of improvement, and the structure has no obvious stress concentration, indicating that the new structure is reasonable in design. Ball Bearing,Deep Groove Bearing,Machining Nut Coal-Based Activated Carbon,Activated Carbon Co., Ltd. , http://www.nbactivatedcarbon.com
The axle box spring with fatigue damage of the product structure features the structure. The characteristics of the structure are as follows: the height of the three layers of rubber is basically equal, the thickness of the three layers of rubber is equal, and the rubber of the inner sleeve is the same as the shear bearing area or the bearing volume. The rubber sleeve and jacket should be greatly reduced, so when the product is loaded, although each layer of rubber is