Vehicle Front Structure With Reinforcement-Limiting 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 frontal collisions 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
1Stability of the object's composition
If no limiting portion is provided to restrict deformation of the inner front side member, then the structure is simpler, 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 a reinforcing member, creating a segmented structure. The limiting portion is further segmented into multiple protrusions that can independently engage with grooves on the inner front side member, allowing localized control of deformation while maintaining overall structural stability.
Solution Approach 2:
The limiting portion acts as an intermediary element between the inner and outer front side members. It mediates their relative movement by providing controlled engagement points through protrusions and grooves, preventing unstable displacement while allowing necessary deformation for energy absorption.
2Reliability
If a limiting portion is added to restrict relative movement, then the bending mode is stabilized, but the device complexity increases
Solution Approach 1:
The limiting portion is merged with the reinforcing member, combining the reinforcement function with the limitation function in a single integrated component. This reduces the number of separate parts and simplifies the overall structure while maintaining both the stabilizing and strengthening functions.
Solution Approach 2:
The limiting portion serves multiple functions: it limits relative displacement between inner and outer front side members, stabilizes the bending mode during collision, and works in conjunction with the reinforcing member to enhance energy absorption. This multi-functionality reduces the need for additional separate components.
3Use of energy by moving object
If the reinforcing member is allowed to move freely in the vehicle front-rear direction, then the structure is more flexible, but the energy absorption capability is reduced due to unstable bending mode
Solution Approach 1:
The structure transitions from a completely rigid connection to a dynamic, controlled connection. The limiting portion allows the reinforcing member to move and deform in a controlled manner during collision, adapting to the impact forces while maintaining stable bending mode for consistent energy absorption performance.
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 structure effectively stabilizes the bending mode of the framework member during frontal collisions, enhancing energy absorption and improving the sustainability of deformation loads.
Implementation Method 1
the reinforcing member being bent to project to a second side in the orthogonal direction at a bending portion provided between the two 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
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AI summary
A vehicle front part structure (10) includes: a framework member (14) having a closed section and extending in a vehicle front-rear direction at a front part of a vehicle (V); a reinforcing member (28) extending in the vehicle front-rear direction within the closed section of the framework member (14), the reinforcing member (28) including both ends in the vehicle front-rear direction that are attached to a wall portion (22A) of the framework member (14) on a first side in an orthogonal direction orthogonal to the vehicle front-rear direction, the reinforcing member (28) being bent to project to a second side in the orthogonal direction at a bending portion (30) provided between the both ends; and a limiting portion (40; 54, 58; 62, 64) configured to limit relative movement of the reinforcing member (28) in the vehicle front-rear direction with respect to a wall portion (26A) of the framework member (14) on the second side.