Bumper Reinforcement Rigidity Control for Center Pole Collision
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Solution Overview
Problem
In vehicle collisions, existing bumper reinforcement designs fail to control the position of bending during a center pole collision, leading to local pressure on the vehicle body due to shear forces, which can cause the engine unit to split and press against the vehicle body.
Innovation Solution
A bumper reinforcement design featuring a body portion with varying rigidity regions and a reinforcing member that overlaps specific boundary positions, ensuring controlled bending during a center pole collision, thereby dispersing loads and preventing local pressure on the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bumper reinforcement is made with uniform rigidity, then the structure is simple and easy to manufacture, but the bending position cannot be controlled during center pole collision, causing local pressure on the vehicle body
Solution Approach 1:
The bumper reinforcement employs local quality by creating regions with different rigidity characteristics. Specifically, the reinforcement has a first region with lower rigidity and a second region with higher rigidity, where the rigidity ratio between them is controlled within a specific range. This allows the lower rigidity region to bend first during collision, controlling the bending position and preventing local pressure on the vehicle body, while maintaining overall structural integrity.
Solution Approach 2:
The invention applies parameter changes by controlling the rigidity parameter of different regions of the bumper reinforcement. By adjusting the rigidity ratio between the first and second regions to be within a specific range, the invention optimizes the bending behavior during collision. This parameter control ensures that the reinforcement bends at the desired location rather than causing uncontrolled local pressure on the vehicle body.
2Strength
If the bumper reinforcement has high rigidity throughout, then the strength is improved, but the bending position cannot be controlled, leading to shear forces that may split the engine unit
Solution Approach 1:
The bumper reinforcement uses local quality by dividing the structure into regions with different rigidity characteristics. The first region has lower rigidity and the second region has higher rigidity, with their rigidity ratio controlled within a specific range. This allows the lower rigidity region to yield first during collision, controlling the bending position and preventing shear forces that could split the engine unit, while the higher rigidity region maintains overall strength.
Solution Approach 2:
The invention applies segmentation by dividing the bumper reinforcement into distinct regions with different rigidity properties. The first region and second region are segmented along the longitudinal direction, with the segmentation line positioned at a specific location. This segmentation allows different parts of the reinforcement to perform different functions during collision, with the lower rigidity region absorbing initial impact through controlled bending.
3Object-affected harmful factors
If the bumper reinforcement bends in front of the first mechanical portion, then the shear force may split the engine unit, but if it bends in front of the second mechanical portion, the load is dispersed and the body is protected
Solution Approach 1:
The bumper reinforcement employs local quality by creating a specific rigidity distribution pattern. The first region has lower rigidity and the second region has higher rigidity, with their rigidity ratio controlled within a specific range and the segmentation line positioned at a specific location. This configuration ensures that during center pole collision, the reinforcement bends in the lower rigidity region, causing the bent portion to contact the engine unit and disperse loads, thereby protecting the vehicle body from local pressure while maintaining engine unit integrity.
Data Source
AI summary
A bumper reinforcement includes a body portion joined to a vehicle body front end portion through portions of the body portion on a first direction side and a second direction side in the vehicle width direction, and a reinforcing member joined to the body portion along the body portion. The body portion includes a first standard rigidity region, a high rigidity region, and a second standard rigidity region arrayed next to each other in this order in the vehicle width direction. The high rigidity region has rigidity higher than rigidity of the first standard rigidity region and rigidity of the second standard rigidity region and is positioned in a center of the body portion in the vehicle width direction. The reinforcing member is provided so as to at least partially overlap the high rigidity region and the first standard rigidity region through a first boundary position.