Vibration Test And Dynamic Analysis Of Hypoid Gear In Micro-vehicle Main Reducer

Hypoid gear is most widely used in the rear axle main reducer of modern micro-vehicle, its characteristic is that the axeses of driving and driven axle don't intersect but cross in the space, which the spatial cross-angle is 90°, driving gear has upward or downward offset relative to driven gear. Compared to bevel gear, hypoid gear has larger overlap coefficient, lower gear contact stress, more smooth transmission, lower impact and noise, higher load bearing capacity, longer life and so on.With the rapid development of vehicle technology, people's comfortability demand of micro-vehicle is higher and higher, manufacturing of micro-vehicle also have higher requirements to the vibration of rear axle main reducer. Hypoid gear is an important part in the main reducer, when it transmits torque, it has more complex work conditions, big load fluctuation range, great tooth surface contact stress and tooth root bending stress of gear teeth. If the gear does not meet the design requirements in manufacturing, assembly adjustment and running-in period, the gear pair will generate vibration and noise in the meshing work process, which affect the smooth running of vehicle and riding comfort of people. This paper primarily studies the question which assembly adjustment of hypoid gear cause vibration of rear axle, there is a great significance for reducing the vibration and noise of micro-vehicle rear axle main reducer, the study method of rear axle main reducer is the first time in China.In this paper, the center distance of driving gear is assembled according to the normal, left and right, then research its effect to micro-vehicle rear axle vibration. Firstly, the vibration test system is introduced, including the design of test experiment platform and summary of software system, and three types of assembly using the vibration test system are tested and analyzed, obtain the conclusion that the assembly adjustment has an effect on the vibration of micro-vehicle main reducer. Secondly, the cutting tooth principles and processing methods of hypoid gear are elaborated, three-dimensional entity models of hypoid gear are established by the use of the cutting tooth principle and processing method, the virtual assembly and interference control analysis are done for three types of assembly. Then the kinematics and dynamics simulation of hypoid gear is done by using virtual prototyping technology for three types of assembly, and theoretically, the rotational speed, the angular acceleration, the time or frequency-domain plot of the meshing force of hypoid gear are analyzed. Lastly, according to the comparing of theoretical analysis results and actual test results, the correctness of the actual test results is proved by the results of theoretical analysis. Theoretical research and experimental results of this paper illustrate that the gear assembly adjustment is an important factors of impacting vibration and noise of the main reducer.