Vehicle Front Structure Closed Cross-Section Stiffness
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Solution Overview
Problem
Conventional vehicle body front part structures face challenges in effectively suppressing dashboard membrane vibration due to deformation of the cowl's bottom surface when stiffening members are joined, leading to inadequate stiffness enhancement.
Innovation Solution
A vehicle body front part structure featuring a center frame with a bent top end flange and a dashboard lower with a bent part, joined to form a closed cross-section, along with a front glass support panel and dashboard cross member, which increases stiffness and supports the dashboard effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stiffening member is joined to the bottom surface of the cowl, then the stiffness of the dashboard is increased, but the bottom surface of the cowl is deformed causing dashboard membrane vibration
Solution Approach 1:
The invention divides the stiffening function into two separate components: a stiffening member joined to the dashboard and a support member joined to the cowl. This segmentation prevents the deformation transfer that occurs when a single stiffening member is joined to both surfaces, thereby eliminating the membrane vibration problem while maintaining dashboard stiffness.
Solution Approach 2:
The invention introduces a support member as an intermediary component between the cowl and the stiffening member. This support member receives the reaction force from the stiffening member and transfers it to the cowl, preventing direct deformation of the cowl's bottom surface and subsequent membrane vibration.
2Strength
If a stiffening member is joined to the bottom surface of the cowl, then the stiffness of the dashboard is increased, but the reaction force deforms the cowl
Solution Approach 1:
The invention separates the stiffening function from the support function, creating distinct members for each purpose. The stiffening member provides dashboard stiffness while the support member independently manages the reaction forces, preventing cowl deformation and maintaining shape stability.
Solution Approach 2:
The support member acts as an intermediary that intercepts and redirects the reaction forces generated by the stiffening member. By providing this intermediate force transfer path, the cowl is protected from direct deformation while the dashboard maintains its stiffness.
Data Source
AI summary
A vehicle body front part structure according to a first aspect of the present invention includes: a center frame which extends along a vertical direction of a vehicle, a top end flange part that bends toward a rear being formed on a top end of the center frame; and a dashboard lower which has a first vertical wall, a bent part that is bent toward the rear being formed on a top edge of the first vertical wall. The top end flange part and the bent part are joined overlapping each other, and a closed cross-section structure part is formed between the center frame and the bent part.