Method for determining repeated welding position of differential shell and driven gear of electric vehicle

Abstract

The invention discloses a method for determining the repeated welding position of a differential mechanism shell and a driven gear of an electric vehicle, and provides the steps for determining the repeated welding position of the differential mechanism shell and the driven gear in detail from the aspects of finite element model building, calculation working condition selection, result analysis and the like. Weld joint damage overall distribution after linear superposition is obtained, a weld joint fatigue damage small area can be visually analyzed, the weld joint fatigue damage small area serves as a preferable area of the repeated welding position, the service life of the repeated welding position can be effectively guaranteed, the weld joint reliability is improved, and the welding quality is improved. Tediousness caused by manual repeated analysis and judgment of welding seam stress distribution under multiple typical working conditions is avoided, the repeated welding position determining process is simplified, the problem that the precision is poor when the repeated welding position is determined directly according to the welding seam stress is solved, different engineers can objectively determine the repeated welding position, and the welding quality is improved. And effective guidance is provided for implementation of a welding process.

Description

technical field [0001] The invention belongs to the technical field of transmission systems, and in particular relates to a method for determining the repeated welding position of an electric vehicle differential case and a driven gear. Background technique [0002] In order to facilitate the lightweight design of the electric vehicle transmission system and reduce the moment of inertia and churning loss of the differential, the connection between the differential housing and the supported driven gear is improved from the traditional bolt connection to the laser welding connection. Welding saves the connection bolts used to fasten the differential housing and the driven gear, and avoids drilling holes on the differential housing and the driven gear. It has high production efficiency and simple process. Preferred connection method of materials. [0003] The differential case and the driven gear are axisymmetric rotating parts. Under the action of the large impact load of the...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the existing problem that the differential case and the driven gear are connected together by laser welding, repeated welding is used at the arc start and end positions of the weld to ensure the integrity of the weld, but repeated welding will introduce secondary welding defects In order to solve the problem, the present invention provides a method for determining the repeated welding position of the electric vehicle differential case and the driven gear. In the product design stage, it is necessary to select the repeated welding position in the area with less fatigue damage to the weld and predict the fatigue of the repeated welding position. Whether the performance can meet the requirements, effectively reduce the influence of welding defects in repeated welding, and ensure the connection strength of the weld seam in the repeated welding area

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