Vehicle Bonnet Side Wall Shock Absorption
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Solution Overview
Problem
The existing vehicle bonnet structures have inadequate shock absorption performance, particularly in front portions, which can lead to increased injury risk for pedestrians during collisions due to insufficient height and rigidity of the side walls.
Innovation Solution
The vehicle front structure incorporates a cover member with a higher ratio of low-rigidity members, such as elastomer resin, in the front portions of the side walls relative to high-rigidity members like PP material, enhancing shock absorption while maintaining structural rigidity and integrating thermal insulating members for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the height of the side wall of the cover member is increased to enhance shock absorption, then the shock absorption performance is improved, but the device complexity and manufacturing difficulty increase due to the lower height of the bonnet toward the front side
Solution Approach 1:
The side wall is divided into different sections with different rigidity characteristics. The front portion uses a low-rigidity member to enhance shock absorption, while the rear portion uses a high-rigidity member to maintain structural stability. This local differentiation allows each section to perform its specific function optimally without requiring increased overall height.
Solution Approach 2:
The cover member employs a composite structure combining two different materials: a low-rigidity member (first material) for the front portion and a high-rigidity member (second material) for the rear portion. This composite approach enables the structure to simultaneously achieve shock absorption and structural integrity without increasing complexity.
2Object-affected harmful factors
If the ratio of low-rigidity member is increased in the front portion of the side wall, then the shock absorption performance is improved, but the rigidity of the opening-closing cover is reduced
Solution Approach 1:
Different portions of the side wall are assigned different rigidity characteristics based on their functional requirements. The front portion has high ratio of low-rigidity member for shock absorption, while the rear portion has high-rigidity member for structural support, resolving the contradiction between local shock absorption and overall rigidity.
Solution Approach 2:
The composite structure combines low-rigidity and high-rigidity members in specific proportions and positions. The low-rigidity member (first material) and high-rigidity member (second material) work together to provide both shock absorption capability and sufficient structural rigidity for the opening-closing cover.
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
This configuration significantly improves the shock absorption performance of the bonnet's front portion, reducing the impact on pedestrians during collisions while ensuring the structural integrity and thermal insulation of the vehicle.
Implementation Method 1
a front portion of at least one of the left and right side walls is configured to have, relative to a rear side of the at least one of the left and right side walls, a higher ratio of a low-rigidity member having lower rigidity than a high-rigidity member forming a main portion on the rear side
Implementation Method 2
the low-rigidity member having lower rigidity than a high-rigidity member forming a main portion on the rear side
Implementation Method 3
A thermal insulating member may be mounted on an inner wall face side of the side wall
Data Source
AI summary
A vehicle front structure includes, below a bonnet (6), a cover member (1) that covers an engine from an upper portion thereof to the side and is formed by an upper wall (30), a shroud (8) as a front wall, a rear wall (13), and side walls (11, 12) on the respective left and right sides. The cover member is formed by the upper wall, the front wall, the rear wall, and the side walls on the respective left and right sides. The front side of one of the left and right side walls is configured to have, relative to the rear side, a higher ratio of a low-rigidity member having lower rigidity than a high-rigidity member forming a main portion on the rear side.