Method for improving finite element analysis accuracy of transmission case

Abstract

The invention relates to a method for improving finite element analysis accuracy of a transmission case. The method comprises the steps of establishing a finite element model of an assembly consisting of major parts such as a clutch case, the transmission case, an upper cover and gears, applying gear engagement force to gear engagement nodes, fixing bolt holes of the clutch case connected with a flywheel case, applying rotation freedom degree constraints of gear shafts between all gears and corresponding supporting bearings on two sides and fully cutting off paths of transmission of torque from gear shafts to case bearing holes. The method for improving finite element analysis accuracy of the transmission case has the advantages that since the rotation freedom degree constraints of gear shafts are applied between all gears and corresponding supporting bearings on two sides, relative rotation or relative rotation trend between bearings and bearing holes is prevented, the problem that the stress of the bearing holes in the case is relatively large is solved, the finite element simulation of the transmission case is more compliant with the actual situation, the finite element analysis accuracy of the case is effectively improved, and further the goals of improving the product design accuracy, reducing the product test frequency and decreasing the product development cost are achieved.

Description

technical field [0001] The invention relates to a method for improving the precision of finite element analysis of auto parts, in particular to a method for improving the precision of finite element analysis of a transmission casing. Background technique [0002] As an important basic component, the transmission housing should have sufficient strength to resist the loads such as the gear meshing force caused by the strong torque of the engine and the inertia force of the transmission caused by uneven road surfaces, so as to support the gear shaft and protect the gear transmission mechanism to meet the requirements of the entire vehicle. The purpose of different torque and speed requirements of the transmission. [0003] At present, the finite element method is widely used in the strength checking method of the transmission case. It first converts the gear shaft torque into the gear meshing force (including radial force, axial force, and circumferential force) according to th...

AI Technical Summary

Problems solved by technology

During this process, since the gear shaft is an elastic body, the gear shaft will undergo torsional deformation. When the torsional deformation passes through the bearing, the finite element model of the bearing and the finite element model of the bearing hole will rotate relative to each other, or have a tendency to rotate relative to each other. This causes misalignment and extrusion between multiple smaller planes in the finite element mesh model of bearings and bearing holes that are in contact with each other, thus consuming part of the torque

The dislocation and extrusion of the finite element model of the bearing and the bearing hole will cause the expansion of the bearing hole in the radial direction of the shell, resulting in the deformation of the bearing hole being inconsistent with the actual situation, and the structural stress is too large, which will eventually lead to a decrease in the simulation accuracy of the finite element analysis of the shell The problem

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