Rear Floor Tunnel Structure for High-Rigidity Vehicle Body
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Solution Overview
Problem
Existing rear vehicle body structures suffer from low rigidity and complex load transmission due to the addition of reinforcement members, leading to increased parts and reduced efficiency.
Innovation Solution
A rear vehicle body structure with a tunnel-shaped raised part formed by bending the rear floor panel and a flange protruding from the rear cross member, coupled to form a simple and efficient load path, enhancing rigidity without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reinforcement member is added to couple the rear cross member and cross member, then rigidity is improved, but device complexity increases
Solution Approach 1:
The patent integrates the reinforcement function directly into the rear floor panel by forming a raised part that couples the rear cross member and cross member, eliminating the need for a separate reinforcement member. This merging of functions reduces the number of parts while maintaining rigidity enhancement.
Solution Approach 2:
The patent creates a three-dimensional raised part on the rear floor panel that extends in the vehicle width direction, adding vertical dimensionality to provide rigidity reinforcement without requiring additional linear components. This dimensional approach allows the floor panel itself to serve as the reinforcement structure.
2Strength
If multiple parts are used to enhance rigidity, then strength is improved, but manufacturing efficiency decreases
Solution Approach 1:
The reinforcement structure is merged with the rear floor panel as an integrated component, reducing the number of parts that need to be manufactured and assembled. This integration streamlines manufacturing processes and improves production efficiency while maintaining the rigidity-enhancing function.
Solution Approach 2:
The rear floor panel serves multiple functions simultaneously: it provides the floor surface and also forms the raised reinforcement part that couples structural members. This self-service approach eliminates the need for separate reinforcement components and reduces manufacturing complexity.
Data Source
AI summary
A rear vehicle body structure of a vehicle includes: a rear floor panel provided below a rear seat; a rear cross member to which a rear edge part of the rear floor panel is coupled; a tunnel-shaped raised part that is provided by bending the rear floor panel at a center region in a vehicle width direction of the vehicle, and extends in a forward-rearward direction of a vehicle's body; and a flange that is provided by bending the rear cross member at a center region in the vehicle width direction, and protrudes toward a forward side of the vehicle body from a front wall of the rear cross member. The rear edge part of the rear floor panel is coupled to the rear cross member, in a state where left and right side walls on a rear end side of the raised part are abutted on the flange.