Front Side Frame Reinforcement for Crash Load Absorption
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Solution Overview
Problem
Conventional vehicle body structures with mounting members fastened below front side frames lack overall rigidity, limiting their ability to absorb large loads and deform appropriately during crashes, as they rely solely on the lower walls for support rigidity and do not effectively utilize the entire frame's rigidity.
Innovation Solution
The structure includes reinforcing members attached to the upper portions of front side frames, supporting members fixed to the inner surfaces below the reinforcing members, and second mounting members above the frames, with partition portions arranged at specific inclination angles to enhance support rigidity and load absorption during crashes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mounting members are fastened only to lower walls of front side frames, then the structure is simple, but the support rigidity is insufficient and cannot utilize the entire frame's rigidity
Solution Approach 1:
The patent transitions from a single-point fastening structure (only lower walls) to a multi-dimensional support system by adding upper cross members and multiple fastening points distributed across different heights and positions of the front side frames, thereby utilizing the entire frame's rigidity in three-dimensional space
Solution Approach 2:
The mounting structure is divided into multiple independent fastening points and support elements distributed across the front side frames. Each mounting member is fastened at multiple locations (lower walls, upper cross members) rather than a single location, segmenting the load path to utilize different portions of the frame structure
2Strength
If only lower wall thickness is increased to improve support rigidity, then the local strength improves, but the overall load absorption capability remains limited
Solution Approach 1:
Instead of increasing material quantity in one dimension (lower wall thickness), the patent distributes fastening points across multiple dimensions (height, length, width) by adding upper cross members and positioning mounting members at various locations, thereby improving rigidity through geometric configuration rather than material volume
3Reliability
If mounting members are arranged only below front side frames, then the installation is simple, but the load absorption during crash is insufficient
Solution Approach 1:
The load absorption function is segmented across multiple mounting locations (below front side frames and above front side frames) and multiple fastening points on each mounting member. This distribution of fastening points across different heights and positions allows the structure to absorb crash loads more effectively by utilizing the entire front side frame structure
Solution Approach 2:
The patent adds vertical dimension to the mounting structure by fastening mounting members at both lower and upper portions of the front side frames. This multi-level fastening arrangement creates a three-dimensional load path that enhances crash load absorption capability compared to single-level mounting
Data Source
AI summary
A structure for the front section of a vehicle body is provided with: a pair of left and right front side frames; a sub-frame which is disposed between the front side frames; a pair of left and right first mount members which are disposed below the front side frames; first affixation members which affix the first mount members to the lower sections of the front side frames; first support members which are provided within the front side frames and which support the first affixation members; and reinforcement members which reinforce damper housings. The reinforcement members are joined to the upper sections of the front side frames. The first support members are affixed to the inner surfaces of the front side frames at positions below the portions to which the reinforcement members are joined.