Vehicle Body Front Structure Side Collision Load Path
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing vehicle front pillar structure fails to effectively transmit side collision loads to surrounding members like the cowl during a barrier side collision, leading to bending of the front pillar.
Innovation Solution
A body front structure with a first connecting member extending in the vehicle width direction to connect the cowl and a second connecting member extending in the vehicle longitudinal direction to the front pillar inner panel, allowing side collision loads to be transmitted to both the instrument panel reinforcement and the cowl, thereby reinforcing the cowl and preventing front pillar bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only the instrument panel reinforcement bracket is used to connect the front pillar, then the structure is simple, but the side collision load is not sufficiently transmitted to surrounding members like the cowl
Solution Approach 1:
The connecting member is divided into two separate members: a first connecting member extending in the vehicle width direction to connect the cowl's front and rear end portions, and a second connecting member extending in the vehicle longitudinal direction to connect the cowl to the front pillar inner panel. This segmentation allows each member to specialize in transmitting loads in specific directions, improving overall reliability of side collision load transmission.
Solution Approach 2:
The solution transitions from a single connecting member to a two-dimensional arrangement of connecting members. The first connecting member operates primarily in the vehicle width direction, while the second connecting member operates in the vehicle longitudinal direction, creating a planar load transmission path that efficiently distributes side collision loads across multiple structural elements.
2Reliability
If the first connecting member is added to connect the cowl's front and rear end portions, then the side collision load transmission to the cowl is improved, but the device complexity increases
Solution Approach 1:
The cowl serves multiple functions: it acts as a structural component that transmits side collision loads (through both connecting members), provides a mounting surface for the first connecting member, and contributes to the overall rigidity of the vehicle front structure. This multi-functionality justifies the addition of the first connecting member without proportionally increasing complexity.
Solution Approach 2:
The first and second connecting members are combined to form an integrated load transmission system. The front end portion of the second connecting member overlaps with the first connecting member when viewed along the vehicle longitudinal direction, creating a coordinated structure where both members work together to transmit side collision loads from the cowl to the front pillar and surrounding members.
Data Source
AI summary
A body front structure of a vehicle includes: a first connecting member that extends in a vehicle width direction, is open upward in a side sectional view, and connects a front end portion and a rear end portion of a cowl together; and a second connecting member that extends in the vehicle longitudinal direction, in a position to a rear of the cowl in the vehicle longitudinal direction and to an inside of a front pillar inner panel in the vehicle width direction, a front end portion of the second connecting member being fixed to the rear end portion of the cowl so as to overlap with the first connecting member when viewed along the vehicle longitudinal direction, and a rear end portion of the second connecting member being fixed, together with a bracket joined to an instrument panel reinforcement, to the front pillar inner panel.