Automobile Front Side Frame with Variable Pipe Orientation
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Solution Overview
Problem
Existing automobile chassis frame structures face challenges in minimizing deformation and absorbing impact during frontal collisions, as they either require numerous components or have constant cross-sectional shapes, limiting impact absorption performance.
Innovation Solution
The proposed solution involves an automobile chassis frame structure formed by arranging and joining multiple pipe materials in different directions and with varying strengths along the longitudinal direction, allowing for a change in cross-sectional shape and strength distribution, and incorporating non-uniform welding pitches and groove-shaped beads for enhanced stiffness and rust prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross-sectional shape or strength distribution is changed along the longitudinal direction of the front side frame, then the impact absorption performance is improved, but the number of components greatly increases
Solution Approach 1:
The front side frame is divided into multiple sections along its longitudinal direction, with each section having a different cross-sectional shape formed by arranging pipe materials in specific directions. This segmentation allows the frame to have varying strength distribution to improve impact absorption performance while maintaining a relatively simple structure by using only a few pipe materials joined together
Solution Approach 2:
Different sections of the front side frame are given different local qualities through varying the arrangement directions of pipe materials. The first portion has pipe materials arranged in a first direction, the second portion has them arranged in a second direction, and the third portion transitions between these directions, creating localized strength variations optimized for impact absorption in different regions
2Device complexity
If a pipe material having a constant cross section is bent into a predetermined shape, then the number of components or weight is reduced, but the cross-sectional shape or strength distribution cannot be changed along the longitudinal direction
Solution Approach 1:
Instead of changing the cross-sectional shape of individual pipe materials, the invention changes the arrangement direction of multiple pipe materials along the longitudinal dimension. By arranging pipe materials in different directions (first direction in first portion, second direction in second portion), the effective cross-sectional shape of the frame member varies along its length, achieving strength distribution control without complex pipe bending
3Ease of manufacture
If the plurality of pipe materials are joined with uniform welding pitches, then the manufacturing process is simplified, but the bending stiffness cannot be optimized along the longitudinal direction
Solution Approach 1:
The welding pitch is varied locally along the longitudinal direction of the frame member to optimize bending stiffness in different sections. By adjusting the welding pitch according to the specific requirements of each portion (first, second, and third portions), the frame achieves optimized structural performance while maintaining a relatively simple joining process using multiple pipe materials
Data Source
AI summary
A first and second pipe materials forming a front side frame are arranged in an up-and-down direction in a first horizontal portion, in a left-and-right direction in a second horizontal portion, and replaced from the up-and-down direction to the left-and-right direction in an inclined portion between the first horizontal portion and the second horizontal portion, and at least in the first horizontal portion and the second horizontal portion, the first and second pipe materials are welded to each other by welds, and therefore, it becomes possible to change in the longitudinal direction the cross-sectional shape or bending stiffness of the front side frame formed by joining the first and second pipe materials without changing the cross-sectional shapes thereof in the longitudinal direction, thus providing the front side frame that has a light weight but has excellent impact absorption performance at the time of a collision.