Vehicle Rear Structure Joint Rigidity via Segmented Frame
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Solution Overview
Problem
Existing vehicle body rear structures face challenges in improving joint rigidity between the side sill and rear side frame, particularly due to weight increases from battery installations and the need to prevent breakage under collision loads without adding reinforcing members.
Innovation Solution
A vehicle body rear structure design featuring two rows of joint portions between the side sill and rear side frame, with the rear side frame divided into upper and lower components connected via extension members and bead portions, dispersing loads and enhancing rigidity without the need for additional cross members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear side frame is extended to increase joint rigidity, then the joint rigidity between side sill and rear side frame is improved, but the vehicle weight increases
Solution Approach 1:
The rear side frame is divided into upper and lower portions, with the lower portion extending backward from the side sill. This segmentation allows the frame to be optimized for rigidity at critical joints without unnecessarily extending the entire frame structure, thereby reducing overall weight.
Solution Approach 2:
The patent applies local reinforcement by extending the rear side frame lower portion specifically at the joint region where it connects to the side sill. This localized extension provides the necessary rigidity at the critical joint without adding weight to the entire frame structure.
2Reliability
If reinforcing members such as cross members are added to prevent breakage, then the reliability under collision load is improved, but the device complexity and weight increase
Solution Approach 1:
The rear side frame lower portion is designed with a predetermined extension and specific geometric features (such as flanges and web portions) that are formed in advance during manufacturing. This preliminary structural preparation provides breakage resistance under collision loads without requiring additional reinforcing members to be added later.
Solution Approach 2:
The patent modifies the geometric parameters of the rear side frame lower portion, including the extension length, flange dimensions, and web thickness, to optimize the structure for collision resistance. These parameter optimizations provide the necessary strength and rigidity without adding complex reinforcing members.
Data Source
AI summary
A vehicle body rear structure, disposed in a vehicle, includes: a floor panel; a side sill, disposed on an outer side of the floor panel in a width direction of the vehicle and extending along a front-rear direction of the vehicle; and a rear side frame, connected to a rear portion of the side sill and extending at a rear portion of the vehicle along the front-rear direction of the vehicle. The rear side frame includes: a rear side frame upper located above the vehicle; and a rear side frame lower located below the vehicle. The side sill includes: a first joint portion, connected to the rear side frame lower; and a second joint portion, connected to the rear side frame upper. The first joint portion and the second joint portion are juxtaposed in the width direction of the vehicle and extend in the front-rear direction of the vehicle.