| The wheel loader is the machine for scraping and transporting the soil with the strongpoint such as fast working rate, high efficiency, excellent flexibility and light operation. It has become one of the most important machines on the construction building of all kinds of projects, so it is the necessary equipment for mechanization construction in modern times.The drive axle of the wheel loader is used for transmitting the power from the engine to the rear wheels and it is vital for the power capability .The output power of the engine is conveyed from the clutch, gearbox, gimbals, and transmission shaft in turns to the drive axle in rear wheel so as to drive the wheel loader. If the traction is larger than the resistance force, the wheel loader could be started up and drive normally. As the increasing engine power, the lightweight configuration and the comfort capability is required today, the improvement of the driveline capability has become more and more necessary.This thesis is studied on the drive axle of the 80 wheel loader. I built the 3D model of the drive axle based on the software Pro/E. All the gears were built by parametric. First the cylindrical gear was built by its character, and then it was paramedical by the Pro/Program provided by the software Pro/E. After that, we could rebuild the gears by inputting some required parameters so that the work could be much easier.This thesis introduced the data-shift method between the software ADAMS and Pro/E. And I transmitted the Pro/E model into ADAMS, added the restriction and the load on system,chose the impact-contact parameters of the gears, at last built the whole virtual prototype model of the drive axle. Also I simulated the model in dynamics for 5 classical working conditions such as driving point-blank with fully load, braking and the special road surface. I found that the gear force was waving around some equal value, the respond curve has good periodicity so as to show the characteristic of the gear joint. Also I found that the dynamic force was larger than the static one and the swing was larger with more dynamic element when the higher rotate speed. To the beginning high swing impact of the planet gear system, I got the result that the clearance between the gear tooth with sudden load in high speed could cause serious problem. When braking and loading, the condition was most abominable in the main transmission gears and it could come about many times of the sudden force so that the vibration would be strong with sharp yawp. This thesis provided the base for the noise analysis and exception diagnoses, also the results could be used as the boundary conditions for some analysis software.The wheel axle is one of the most important components of the drive axle, the capability has a great effect on the reliability and its working life. The wheel axle is a very long shaft which could make large dynamic response to the wheels. In this thesis, I studied the field on multi-body dynamics and the flexible body theory, made the wheel axle flexible, analyzed the model in free mode by the software ANSYS and ADAMS/FLEX so as to create the MNF file which was a fact FEA model, and finally built the rigid-flex multi system model. Compared with the rigid system, I got some infection elements for the detail project.The tolerance and errors caused by making and fixing the gears by mistake is vital to the vibrating phenomenon. And the eccentricity error periodically always makes the pinion-gear system with asymmetrical load. In this thesis ,I analyzed the dynamic inspirit infection by fixing error and found that the eccentricity error pricked up the nonlinear character which could cause much larger impulsion load so that the dynamic character of the system got worse. Therefore, we should avoid all kinds of eccentricity error when making and fixing the gears. |
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