Load Characteristics of Gearbox Bearing of High-speed EMU

doi:10.3901/JME.2024.15.173

Abstract

Abstract: Gearbox is one of the important parts of high-speed EMUS. It is connected with axle and coupling through various types of bearings. These bearings play an important role in realizing power transmission of gearbox and ensuring the safety and stability of train operation. Due to the difficulty of engineering testing, it is difficult to directly test the bearing load. Based on the bearing dynamics theory and gear transmission dynamics theory, a coupling dynamic model including bearings, gear meshing and gearbox body is established. Combined with the measured excitation of the line, the contact load of the roller raceway of the gearbox bearing was obtained by numerical method. On the basis of verifying the load distribution characteristics of bearing roller raceway, the contact load of the gearbox bearing roller raceway under various working conditions is analyzed. The results show that the mean contact load of roller raceway of cylindrical roller bearing is mainly affected by traction torque, and the traction force also affects the number of loaded rollers. The gear meshing force affects the local fluctuation amplitude of roller raceway contact load. Under external excitation, the maximum value of the NU214 bearing roller raceway contact load increases by 35.0%. The loading distribution area and mean value of roller raceway contact load will be changed by train running condition, but the position of contact area is not affected by train speed. The coupling model of gearbox is useful to investigate the load characteristics of gearbox bearing.

Key words: gearbox of high-speed EMU, dynamic model of transmission system, bearing, load

CLC Number:

U270

CAO Jie, REN Zunsong, ZHA Hao, XU Ning, YANG Chao. Load Characteristics of Gearbox Bearing of High-speed EMU[J]. Journal of Mechanical Engineering, 2024, 60(15): 173-184.

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