Rear Body Hook Reinforcement Layout for Controlled Collision Bending
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Solution Overview
Problem
Existing vehicle body rear structures face challenges in reducing damage during rear collisions, particularly due to the movement of trailer hitch devices, and require a safety structure that effectively manages deformation to prevent damage to electrical components while maintaining towing capability.
Innovation Solution
A vehicle body rear structure featuring a hook reinforcement part with multiple independent members connected in series, a weakened part for controlled deformation, and a lower hook position, which allows the hook reinforcement part to bend at a target position, preventing invasion into the vehicle's electrical housing and enhancing towing force capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-element reinforcing member with a bracket is used, then the structure is simple, but the bracket position becomes too high for vehicles with high chassis rear, requiring additional lowering structures
Solution Approach 1:
The reinforcing member is divided into multiple segments (first reinforcing member, second reinforcing member, third reinforcing member) connected in series. This segmentation allows the bracket to be positioned at the end of the third reinforcing member, achieving a lower effective bracket position relative to the chassis rear while maintaining structural simplicity through modular design
Solution Approach 2:
The multiple reinforcing members are arranged in a stepped configuration along the width direction of the vehicle, creating a multi-level structure. This dimensional arrangement allows the bracket to be positioned lower relative to the chassis rear by utilizing the width-directional offset between segments
2Object-affected harmful factors
If the reinforcing member is made rigid to prevent invasion into electrical housing during collision, then protection is improved, but the member cannot deform to absorb collision energy
Solution Approach 1:
Different sections of the reinforcing member have different mechanical properties. The first reinforcing member has high rigidity to prevent invasion into electrical housing, while the second and third reinforcing members have lower rigidity to allow controlled deformation and energy absorption during collision
Solution Approach 2:
The weaker second and third reinforcing members are designed to deform plastically during rear-end collision, converting the harmful collision energy into beneficial deformation work. This controlled deformation absorbs energy while the stronger first reinforcing member maintains its position to protect electrical components
3Ease of manufacture
If the hook reinforcement part is positioned higher to match the chassis rear, then installation is simplified, but the towing force capacity is reduced
Solution Approach 1:
The hook reinforcement part is segmented into multiple members arranged in series, creating a stepped structure that extends downward. This allows the hook to be positioned lower for increased towing capacity while the upper segments maintain connection to the chassis rear for simplified installation
Solution Approach 2:
The reinforcing members are arranged in a stepped configuration along the width direction, allowing the hook to be positioned at a lower vertical level while maintaining horizontal connection to the chassis. This multi-dimensional arrangement preserves installation simplicity while achieving lower hook position for enhanced towing capacity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure effectively reduces damage during rear collisions by controlling deformation and maintaining the integrity of electrical components, while increasing the towing force capacity and improving workability through strategic welding bead placement.
Implementation Method 1
the joint boundary part is disposed with a weakened part on a side close to the chassis rear... the hook reinforcement part can be bent at a target position through the disposition of the weakened part
Data Source
AI summary
The disclosure provides a vehicle body rear structure, which can reduce damage to the vehicle during a collision from the rear. The vehicle body rear structure includes a chassis rear, a hook reinforcement part fixed to a lower surface of the chassis rear; and a hook fixed on a back side of the chassis rear through the hook reinforcement part, in which the hook reinforcement part includes a plurality of part members independent from each other, the plurality of part members are connected in series and joined in a front-back direction of the vehicle to form a joint boundary part, and the joint boundary part is disposed with a weakened part on a side close to the chassis rear.