Vehicle Front Body Structure with Curved Cowl Top Extension
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Solution Overview
Problem
Existing vehicle front body structures face challenges in maintaining vertical clearance between the cowl box and hood while ensuring rigidity, often leading to weight increase when trying to enhance strut tower rigidity, and are prone to deformation under longitudinal loads.
Innovation Solution
A front body structure featuring a cowl box with a curved shape and a connecting member, the cowl top extension, which ties the strut towers at their tops and extends horizontally, maintaining the same height as the strut towers, providing a curved shape with its central portion at the rear, and is connected to the cowl box, enhancing rigidity without increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cowl box is used to improve strut tower rigidity, then the rigidity of the vehicle body is improved, but the vertical clearance between the cowl box and hood cannot be maintained
Solution Approach 1:
The invention divides the rigid support function into two separate components: the cowl box provides transverse rigidity for the strut towers, while the strut bar provides longitudinal stability. This segmentation allows each component to be optimized independently, maintaining the required vertical clearance while achieving the desired rigidity.
Solution Approach 2:
The invention transitions from a single vertical support structure to a three-dimensional framework combining the cowl box (transverse direction) and strut bar (longitudinal direction). This dimensional expansion allows rigidity to be achieved through spatial distribution rather than vertical height increase.
2Stability of the object's composition
If a C-shaped strut bar is used to tie strut towers, then the strut towers are connected, but the strut bar deforms under longitudinal load requiring increased thickness and weight
Solution Approach 1:
The invention merges the cowl box and strut bar into an integrated rigid framework that works together to resist loads from multiple directions. This combination eliminates the need for an overly thick strut bar, as the cowl box provides additional structural support that shares the load-bearing responsibility.
Solution Approach 2:
The invention creates a composite structural system where the cowl box and strut bar function together as a unified rigid framework. This composite approach allows thinner, lighter individual components to achieve the same overall strength as a single thick component.
3Length of moving object
If the hood is positioned higher to maintain clearance, then the vertical clearance is maintained, but the flexibility in engine room design is decreased
Solution Approach 1:
By separating the rigidity-providing functions into distinct components (cowl box and strut bar), the invention allows the hood to be positioned at the optimal height for engine room design flexibility while the segmented structural elements maintain the required vertical clearance and rigidity independently.
Data Source
AI summary
A front body structure for a vehicle including: a cowl box extending in a transverse direction of the vehicle and having a curved shape with its central portion in the transverse direction of the vehicle situated at a front end thereof; and a cowl top extension tying tops of strut towers, extending in front of the cowl box at a height substantially equal to that of each of the tops of strut towers, and having a curved shape with its central portion in the transverse direction of the vehicle situated at a rear end thereof. The cowl top extension and the cowl box are connected to each other at the central portions thereof.