Vehicle Front Side Member Structure for Stable Collision Bending
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Solution Overview
Problem
The existing vehicle front part structure lacks a means to restrict deformation of the inner front side member, leading to unstable bending mode during a frontal collision due to relative displacement between the inner and outer front side members.
Innovation Solution
A vehicle front part structure that includes a framework member with a closed section, a reinforcing member extending in the vehicle front-rear direction within the closed section, and a limiting portion to restrict relative movement of the reinforcing member with respect to the framework member, thereby stabilizing the bending mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no limiting portion is provided to restrict deformation of the inner front side member, then the structure is simpler and easier to manufacture, but the bending mode becomes unstable during frontal collision due to relative displacement between inner and outer front side members
Solution Approach 1:
The front side member is divided into inner and outer front side members with distinct functions. The inner front side member includes a weakened portion for controlled deformation, while the outer front side member provides structural support. This segmentation allows each component to specialize in specific collision response functions, stabilizing the overall bending mode.
Solution Approach 2:
A limiting portion is pre-formed on the outer front side member at a position that will contact the inner front side member during collision. This preliminary structural feature ensures that when collision occurs, the relative displacement between inner and outer members is automatically restricted, stabilizing the bending mode without requiring active control systems.
2Reliability
If a limiting portion is added to restrict relative movement of the reinforcing member, then the bending mode is stabilized during collision, but the manufacturing process becomes more complex
Solution Approach 1:
The limiting portion is integrated directly into the outer front side member as part of its structural geometry, rather than being a separate component. This merging of functions allows the limiting feature to be formed during the same stamping or forming process as the outer front side member itself, reducing manufacturing steps while maintaining collision stability.
Solution Approach 2:
The limiting portion utilizes the thickness direction of the outer front side member to create the restriction feature. By changing the geometric parameters of the outer member to include this thickness-based limiting structure, the patent achieves stable bending mode control without adding separate components or complex assembly processes.
3Reliability
If the reinforcing member is allowed to move freely in the vehicle front-rear direction, then the structure has greater flexibility and ease of assembly, but the bending mode becomes unstable during frontal collision
Solution Approach 1:
The limiting portion acts as an intermediary feature between the inner and outer front side members. It provides a predetermined contact interface that allows normal assembly flexibility while automatically engaging during collision to stabilize the bending mode. This intermediary structure mediates between the need for assembly ease and collision stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution effectively stabilizes the bending mode of the framework member during a frontal collision, enhancing energy absorption and improving the structural integrity of the vehicle front part.
Implementation Method 1
the reinforcing member is bent to project to a second side in the orthogonal direction at a bending portion provided between the both ends
Implementation Method 2
a limiting portion configured to limit relative movement of the reinforcing member in the vehicle front-rear direction with respect to a wall portion of the framework member on the second side
Data Source
AI summary
A vehicle front part structure includes: a framework member having a closed section and extending in a vehicle front-rear direction at a front part of a vehicle; a reinforcing member extending in the vehicle front-rear direction within the closed section of the framework member, the reinforcing member including both ends in the vehicle front-rear direction that are attached to a wall portion of the framework member on a first side in an orthogonal direction orthogonal to the vehicle front-rear direction, the reinforcing member being bent to project to a second side in the orthogonal direction at a bending portion provided between the both ends; and a limiting portion configured to limit relative movement of the reinforcing member in the vehicle front-rear direction with respect to a wall portion of the framework member on the second side.