Look from the Renaissance, high-speed railway vehicles bearing applications

Look from the Renaissance, high-speed railway vehicles 2018 - bearing applications 08 - The euro ( Timken) Domestic emu 'revival number' of the world's top level, once again attracted the attention of the world made in China these days, bums and circle of friends' revival, high-speed 350 kilometers per hour above 400 km/h, standard set by China railway running speed is high. After formal operation, the running time between Beijing and Shanghai will be reduced to 4. 5 hours. Renaissance, rail vehicle speed rising to power system puts forward the challenge, and as an important part of them, it is important to the stability of the gear box. In high-speed train running gear box of the bearing will be facing the test of three aspects, one is the lubrication problem brought by the high speed, the second is high speed under high temperature, the influence of the three is frequent vibration. Three key problems demanding all needs to solve from the to optimize the design of the bearing. Timken since 1929 for railway vehicles bearing solutions, understand the essence. First of all, the high speed railway vehicles is one of the most common conditions of the gear box. Guard because of the large taper roller bearing inner ring with roller large end face of sliding friction in the process of operation and the region is more difficult for lubrication, if choose circular cone roller bearings for gearbox requires correct selection. Taper roller bearings Timken Timken establish strict guard linear velocity selection standard, and by analyzing system for the different application conditions is calculated, the optimization of taper roller bearing with specific design, effective control of sliding friction torque, improves the taper roller bearing high speed applications. And the use of special guard and coating of the bearing structure, due to the strengthened local lubrication, reduce penal place of fever, can be applied to some very high speed gear box. In addition, the lubrication is a key factor of influence on the speed of the bearing capacity, and the various factors that affect the bearing lubrication are load, temperature, clearance, viscosity, etc. , to quantitative analysis of the influence of various factors, and then the design of the lubricating system for gear box to provide professional advice, also is the key technology of timken have ability. Secondly, the high temperature is a common killer destroy the normal running of the gear box. Timken study, when bearing more than for a long time accepted safety operation temperature of 120 ℃ high temperature condition, can cause the loss of bearing raceway surface heat treatment hardness and unstable dimension. Hardness drop can cause the loss of bearing load capacity rating, raceway surface is easy to damage, loose and size change will cause the inner ring, beating out-of-tolerance, structural deformation, etc. These problems seriously threaten the safe running of the railway vehicles. For high-speed rail vehicle gear box applications, timken thermal stability of the use of special processing to meet the application requirement of high temperature condition. In addition to high speed and high temperature, frequent vibration is also the operation condition of the rail vehicle gear box should not be ignored. When the vibration of the wheel by frequent impact, the vibration impact will be directly passed on to the gear box, in particular, installed on the axle bearing will be larger more frequent vibration load. In order to make the bearing to avoid or reduce the vibration load of damage, rail vehicle gear box of timken bearing adopted surface carburizing heat treatment of materials. This kind of bearing high surface hardness and wear resistance, low core hardness, good toughness and is applicable to have impact load applications. In addition, in order to prevent the high speed bearing vibration condition suddenly rupture, while selecting a rail vehicle gear box bearing, timken pay special attention to the strength of the cage and the problem how to control the vibration of the cage phenomenon, through the professional software to simulate the worst operation condition strength analysis, so as to choose the thickness of strengthening, the design optimization of the cage. Practice has proved that timken high-speed gear box bearing cage with sufficient strength to withstand the vibration condition of fracture risk. Timken stringent selection and manufacturing standards make its products meet the railway vehicle gear box at the same time the application requirement of safety, reliability, far more than other industrial applications. In the long-term practice, timken are analyzed the practical application environment influence on bearing life, promote the development of innovative products. 铁姆肯公司® 美联社- 2 bearing at present, the company as the main bearing of global railway vehicle equipment suppliers, to provide innovative high-performance bearings and related products and bearing repair services, including: Timken® High speed railway and metro vehicle gear box bearing Timken® AP™ Bearing the AP - 2™ Traction motor bearing embrace axle box SureFit™ After general block EcoTurn® In China, the labyrinth of timken bearing solution is widely used in high speed railway vehicle gear box, and will be highly regarded by many world famous OEM, also with China railway equipment manufacturing leader in enterprise long-term cooperation, expand overseas. Timken will be there with technology innovation, application and service network throughout the rest of the world, continue to help track efficient, safe and reliable operation of the vehicle, with the Chinese railway industry gain a better future together.