In this paper the 3D model of the three stage helical gearbox was establish using UNIGEAPHICS(UG) firstly, and then the structure static analysis was realized by ANSYS. Accordingly the gear-box' stress distribution, deformation can be obtained, so the strength and stiffness of the gear-box can be calculated based on the stress and the deformation results, which helps us to evaluate whether the design demand can be satisfied or not. The structure static analysis provides suggestions for the improvement of model design, and the finite element simulation to the large, heavy-duty gear-box reducer can provide technical assurance for the dependability of the production.
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