Analysis Of Large And Medium Power Tractor Steering Driving Axle For Paddy Field

For a long time, China’s paddy wheeled tractor power is 47.8kw(65 horsepower) or lower oriented. In recent years, with the development of the rural land circulation and the intensive management, the cultivated area of the family farm and the cooperatives is expanding, paddy field work required tractor power is also growing. But now, China’s large and medium power wheeled tractor for paddy field research work is seriously lagging behind, in order to meet the market demand, manufacturers have transformed dry field tractors simply, such as assembly paddy field type tire, then used as a paddy tractor. Due to the different working conditions and characteristics of crops, when the tractor worked in paddy field, there are mud and other debris into the drive axle, eventually lead to knuckle stuck, axle housing damage and other issues. Therefore, according to the working conditions of paddy field, the development of driving axle should meet the work requirements of paddy field.According to existing problems, combined with the technical requirements of tractor company, we design a 58.8 ~ 73.5kw power tractor steering drive axle for paddy fields in this paper. The finite element method is used to analyze the drive axle housing, and then, comprehensive performance test was carried on drive axle. The specific work of this paper is as follows:(1)According to the technical requirements of tractor company, two design schemes of NGW planetary gear transmission and two bevel gear transmission were proposed. By comparing the transmission efficiency, minimum ground clearance, technical complexity and manufacturing cost, the optimization scheme of the NGW planet gear transmission is determined.(2)After design schemes determined, based on design parameters such as transmission ratio, torque and load to check the design of main components of drive axle, including the main reducer gear, axle shaft, NGW planetary gear, axle housing and so on. Solidworks software was used to develop 3D model of parts and assembly, the model will be used for subsequent research and analysis.(3)The finite element model of axle housing is established in Hypermesh, then import the finite element model into ANSYS software, ANSYS is used to proceed finite element modal analysis, the first 4th order natural frequency and vibration mode shapes were calculated by modal analysis. To verify the accuracy of the finite element analysis, with the modal test system, the laboratory modal testing about axle housing was implemented by exciting method, the first 4th order natural frequency and vibration mode shapes were obtained by modal testing, compared to the finite element analysis results and modal testing results, the finite element model of axle housing were verified. Finally, through the analysis of external excitation frequency, confirmed that axle housing will not produce resonance by external frequency excitation.(4)After finite element model of axle housing were verified, static and fatigue analysis were proceed in ANSYS software, to analysis the intensity, stiffness and fatigue performance of axle housing, the analysis results show that the intensity, stiffness and fatigue performance can meet the requirements.(5)After drive axle designed and manufactured, comprehensive performance test was carried on drive axle, by testing showed that all of sealing, reduction ratio, differential, noise and temperature can meet the requirements.