Cowl Support Structure for Box-Type PBV Front Collision Loads
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Solution Overview
Problem
The front frame strength of box-type design Purpose Built Vehicles (PBVs) is weak, leading to inadequate impact absorption performance in forward collisions.
Innovation Solution
A front vehicle body structure with a cowl support unit that includes a cowl lower cross member, cowl lower support, cowl upper side support, cowl lower side support, fender apron upper member, and cowl cross bar assembly, which are connected to the front pillar and floor reinforcement frame to enhance skeletal strength and distribute collision loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the front vehicle body is designed in a box shape to provide large interior space, then the interior space is increased, but the front frame strength and impact absorption performance become weak
Solution Approach 1:
The front vehicle body structure is divided into multiple functional components: a front cowl, a cowl support unit with multiple members (cowl lower cross member, cowl lower support, cowl upper side support, cowl lower side support, fender apron upper member), and floor reinforcement frames. This segmentation allows each component to be optimized for specific structural functions, particularly for distributing and absorbing collision loads, while maintaining the overall box-shaped interior space.
Solution Approach 2:
The cowl support unit introduces a three-dimensional load distribution system that connects the front cowl to the front pillar and front side member through multiple members arranged in different spatial dimensions. This creates a multi-dimensional structural framework that enhances front frame strength without compromising the interior volume, as the reinforcement is achieved through spatial configuration rather than simply increasing material quantity.
2Volume of moving object
If the front vehicle body is designed in a box shape to provide large interior space, then the interior space is increased, but the impact absorption performance in forward collision becomes weak
Solution Approach 1:
The impact absorption function is segmented across multiple components: the front cowl serves as the initial impact interface, the cowl support unit members (lower cross member, lower support, upper side support, lower side support) distribute the impact loads to the front pillar and side members, and the floor reinforcement frames further dissipate the forces. This segmentation ensures reliable impact absorption while preserving the box-shaped interior space.
Solution Approach 2:
The cowl support unit creates a three-dimensional load path that transfers collision forces from the front cowl through multiple members to the front pillar and side members. This multi-dimensional force distribution mechanism enhances impact absorption performance by dispersing stresses throughout the front vehicle body structure, preventing concentration of forces that would compromise reliability.
3Strength
If a cowl support unit with multiple members is added to enhance skeletal strength, then the front frame strength is increased, but the structural complexity is increased
Solution Approach 1:
The cowl support unit merges multiple structural members (cowl lower cross member, cowl lower support, cowl upper side support, cowl lower side support, fender apron upper member) into an integrated assembly that collectively enhances skeletal strength. By combining these members into a unified support structure connected to the front cowl, front pillar, and front side member, the design achieves high strength while managing complexity through functional integration rather than separate components.
Solution Approach 2:
The cowl support unit members serve multiple functions simultaneously: the cowl lower cross member provides lateral support and load distribution, the cowl lower and upper side supports transfer vertical and diagonal loads to the front pillar, and the fender apron upper member connects to both the cowl lower support and front pillar. This multi-functionality reduces the need for additional specialized components, thereby enhancing skeletal strength without proportionally increasing structural complexity.
Data Source
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AI summary
An embodiment front vehicle body structure includes an underbody, an upper body coupled to the underbody, a front cowl disposed in front of the upper body, and a cowl support unit connected to the front cowl through a front pillar and a front side member of the upper body. An embodiment cowl support unit includes a cowl lower cross member connected to a front of the front side member along a vehicle width direction, a cowl lower support connected to the cowl lower cross member and the front cowl, and a cowl upper side support connecting an upper portion of the front pillar and the front cowl.