Vehicle Body Seat Mount Structure for Flat-Floor Rigidity
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Solution Overview
Problem
The challenge of securely fixing a seat in vehicles with a flat floor configuration, particularly in purpose-built vehicles (PBVs), where there is a significant height difference between the floor and the seating surface near the rear wheel, compromising mountability and vehicle body rigidity without increasing weight.
Innovation Solution
A vehicle body structure comprising a floor panel, rear side members, a partition member, rear and front mounting brackets, and additional components that enhance seat fixation and vehicle rigidity by forming a complex lattice structure without significant weight increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the floor is configured flat to the rear side of the vehicle body, then the vehicle body shape is improved and weight is reduced, but the height difference between the floor and seating surface increases, making seat mounting difficult
Solution Approach 1:
The partition member extends vertically from the floor panel to create additional height at the rear of the vehicle body. This dimensional addition allows the seat to be mounted at an appropriate height relative to the flat floor, resolving the mounting difficulty while preserving the flat floor configuration for weight reduction and aerodynamic benefits.
Solution Approach 2:
The partition member acts as an intermediary structure between the flat floor and the seat mounting location. By providing a vertical intermediate structure, it enables proper seat positioning without requiring a non-flat floor configuration, thus maintaining the benefits of the flat floor design.
2Strength
If additional structures are added to improve seat mounting and vehicle body rigidity, then seat fixation and rigidity are improved, but the vehicle weight increases
Solution Approach 1:
The vehicle body structure is segmented into functional components: the flat floor panel for weight reduction, the vertical partition member for seat mounting support, and the rear side members for structural rigidity. This segmentation allows each component to be optimized for its specific function, achieving overall rigidity without excessive weight gain.
Solution Approach 2:
Additional structural elements are added locally at the rear of the vehicle body where they are most needed for both seat mounting and rigidity enhancement. The partition member and rear side members are positioned specifically at the rear section, providing localized reinforcement without adding unnecessary weight to the entire vehicle body.
3Ease of operation
If the partition member is added to support the seat, then seat mountability is improved, but the device complexity increases
Solution Approach 1:
The partition member serves multiple functions simultaneously: it provides vertical support for seat mounting, enhances the rigidity of the rear vehicle body structure, and maintains the aesthetic lines of the flat floor configuration. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in overall structural complexity.
Data Source
AI summary
An embodiment is a vehicle body structure including a floor panel, rear side members respectively coupled to lower sides of two opposite ends of the floor panel and elongated extending in a lengthwise direction of a vehicle, a partition member mounted and extending in a transverse direction of the lengthwise direction of the vehicle, the partition member and protruding upward from the floor panel, the partition member having two opposite ends coupled to upper sides of the rear side members with the floor panel interposed therebetween, a plurality of rear mounting brackets provided on an upper side of the partition member to support a rear side of a seat, and front mounting components provided at a front side of the partition member and disposed at an upper side of the floor panel to support a front side of the seat.