Rear Vehicle-Body Structure with Overlap Joint Reinforcement
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Solution Overview
Problem
Existing rear vehicle-body structures face challenges in transmitting collision loads efficiently from the rear to the front while maintaining a spacious and compact design for rear seats, often requiring complex and large connection structures to ensure rigidity and strength.
Innovation Solution
A rear vehicle-body structure featuring right-and-left reinforcing members that extend forwardly and inwardly from a rear cross member to connect with a tunnel portion, forming an overlap joint section for enhanced rigidity and compactness, allowing for efficient load transmission without additional connecting members, thus securing sufficient rear seat space and seat cushion thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a connecting member is used to connect the front end portions of the reinforcing members, then the rigidity and strength of the connection portion are improved, but the device complexity and size increase
Solution Approach 1:
The patent merges the left and right reinforcing members by making their front end portions overlap and join to each other directly, eliminating the need for a separate connecting member. This integration maintains connection strength while reducing structural complexity and size.
Solution Approach 2:
The reinforcing members are designed to serve dual functions: they provide structural reinforcement and simultaneously act as their own connecting element through the overlapping front end portions, eliminating the need for a dedicated connecting member.
2Strength
If thick and large-sized reinforcing members and connecting member are used, then the rigidity and strength are improved, but the rear seat living space becomes narrow
Solution Approach 1:
By merging the connecting function into the reinforcing members themselves through overlapping front end portions, the patent eliminates the need for additional thick connecting members, thereby reducing overall structural size while maintaining strength.
Solution Approach 2:
The reinforcing members are configured to extend obliquely forwardly and inwardly, utilizing three-dimensional spatial arrangement to achieve effective load transmission with reduced vertical thickness, thereby preserving rear seat living space.
3Volume of moving object
If the reinforcing members are made simple and compact, then the rear seat living space is improved, but the connection strength may be compromised
Solution Approach 1:
The overlapping front end portions of the reinforcing members create an integrated connection structure that achieves adequate connection strength through direct joining, eliminating the need for additional connecting members and reducing overall structural size.
Solution Approach 2:
The front end portions of the reinforcing members are designed with curved surfaces that facilitate overlapping and joining, creating a compact yet strong connection that minimizes space requirements while maintaining structural integrity.
Data Source
AI summary
A rear vehicle-body structure comprises a floor of the vehicle-body, a right-and-left rear frame extending in a vehicle longitudinal direction on both-sides of a rear of the floor, a rear cross member extending in a vehicle width direction and interconnecting a front of the right-and-left rear frame, and a right-and-left reinforcing member directly or indirectly connecting a tunnel portion provided in front of the rear cross member. The right-and-left reinforcing member is provided on the floor so as to extend forwardly and inwardly in the vehicle width direction from the rear cross member toward the tunnel portion, and respective front end portions of the right-and-left reinforcing member overlap each other and are joined to the floor.