A Finite Element Calculation Method of Misalignment of Bevel Gears Considering the Effects of Multiple Factors

Abstract

The invention relates to a bevel gear dislocation quantity finite element computing method with multi-factor influences taken into account. The bevel gear dislocation quantity finite element computing method comprises the following steps that (1) a support shafting finite element model of a driving gear and a support shafting finite element model of a driven gear are established, wherein the driving gear and the driven gear are respectively composed of a gear shaft and a bearing; (2) a finite element model of a bevel gear drive system is established; (3) the influence of thermal expansion and tolerance fit on the stiffness of the bearings is taken into account; (4) the influence of axial thermal expansion on shafting deformation is taken into consideration; (5) the influence of the stiffness of a main reducing gear shell is taken into consideration; (6) a stiffness equation of the bevel gear drive system is solved, and the dislocation quantity of bevel gears is calculated. According to the bevel gear dislocation quantity finite element computing method, on the basis of a shafting finite element modeling method of a nonlinear bearing unit, processing of the gear pair is introduced, the finite element model of the bevel gear drive system is established, and the dislocation quantity of the bevel gears is calculated through a computation result of system deformation; meanwhile, the influence of thermal expansion, the influence of tolerance fit and the influence of the stiffness of the main reducing gear shell on system deformation of the bevel gear drive system and the dislocation quantity of the bevel gears are comprehensively taken into account, the problem that the factors can not be comprehensively taken into account in an existing analysis method is solved, and the dislocation quantity, obtained through calculation, of the bevel gears is closer to actual situations.

Description

technical field [0001] The present invention relates to a finite element modeling calculation method, in particular to a finite element calculation method for bevel gear misalignment under the influence of multiple factors such as thermal expansion, tolerance fit and main reducer housing rigidity in the general vehicle technical field method. Background technique [0002] Bevel gears (including spiral bevel gears and hypoid gears) are the main parts of the main reducer assembly of automobile drive axles. The misalignment of bevel gears has an important impact on the fatigue life check, and the magnitude of the misalignment directly affects The performance of bevel gear transmission. The misalignment of bevel gears is mainly caused by the systematic deformation of the supporting shafting. In addition to the magnitude of the transmitted load, the main factors affecting the deformation of the support shafting system include thermal expansion, tolerance fit, and the stiffness ...

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Problems solved by technology

To deal with this problem, the existing research methods mainly have two ways: one is to use the finite element method to establish the solid finite element model of the bearing, analyze the bearing deformation under load through nonlinear contact calculation, and then add it to the system deformation In the calculation, but this method is complex in modeling and has a large amount of calculation, so it is often used in the stress and deformation analysis of a single bearing, and is not suitable for the study of the entire transmission system; the second is to establish a bearing unit to simulate the bearing stiffness in all directions Upward coupling nonlinearity, and connecting with the shaft model to establish a system nonlinear finite element analysis model, can effectively solve the problem of system deformation calculation of the supporting shaft system

In addition, another difficulty in the simulation calculation is to consider the influence of factors such as thermal expansion, tolerance fit, and final drive housing stiffness on the deformation of the supporting shafting system, and the existing finite element analysis methods cannot fully take these factors into account. in the calculation

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