Vehicle Subframe Mount Reinforcement for Impact Detachment
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Solution Overview
Problem
Conventional vehicle body structures that aim to protect occupants by causing subframes to come off under excessive loads often result in increased vehicle weight and manufacturing costs due to the need for high rigidity around bolt fastening parts.
Innovation Solution
A vehicle body structure featuring a subframe with a plate-shaped reinforcing member having flanges that surround the fastener, positioned to increase the rigidity of subframe mount parts without adding weight or cost, allowing the subframe to detach under impact while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing plates and box-shaped reinforcing members are added to increase rigidity around bolt fastening parts, then the rigidity is improved, but vehicle weight and manufacturing costs increase
Solution Approach 1:
The patent applies local quality by providing reinforcing members only at specific locations where rigidity is needed (around bolt fastening parts and subframe mount parts) rather than reinforcing the entire subframe. The reinforcing members are strategically positioned to provide local structural support exactly where required for impact absorption and rigidity maintenance.
Solution Approach 2:
The patent segments the reinforcing structure into multiple discrete reinforcing members distributed at different locations on the subframe. Instead of using a single large reinforcing plate, multiple smaller reinforcing members are placed at critical areas such as bolt fastening parts and subframe mount parts, allowing for targeted reinforcement without excessive weight addition.
2Strength
If reinforcing plates and box-shaped reinforcing members are added to increase rigidity around bolt fastening parts, then the rigidity is improved, but manufacturing costs increase
Solution Approach 1:
The patent applies local quality by providing reinforcing members only at specific locations where rigidity is needed (around bolt fastening parts and subframe mount parts) rather than reinforcing the entire subframe. The reinforcing members are strategically positioned to provide local structural support exactly where required for impact absorption and rigidity maintenance.
Solution Approach 2:
The patent segments the reinforcing structure into multiple discrete reinforcing members distributed at different locations on the subframe. Instead of using a single large reinforcing plate, multiple smaller reinforcing members are placed at critical areas such as bolt fastening parts and subframe mount parts, allowing for targeted reinforcement without excessive weight addition.
3Reliability
If the rigidity of bolt fastening parts is reduced to allow subframe detachment under excessive load, then occupant protection is improved, but the structural integrity is compromised
Solution Approach 1:
The patent creates a gradient of rigidity by providing reinforcing members at specific locations (bolt fastening parts and subframe mount parts) while leaving other areas with standard rigidity. This allows the structure to maintain overall integrity through reinforced areas while permitting controlled detachment at designated locations when excessive loads are applied, protecting occupants without compromising overall structural strength.
Data Source
AI summary
A vehicle body structure includes: a subframe arranged in front of an occupant compartment; a subframe rear base arranged in a width direction of a vehicle on a lower surface of the occupant compartment; a floor frame arranged in a longitudinal direction of the vehicle on the lower surface of the occupant compartment; a subframe mount part placed at a portion where the subframe rear base overlaps with the floor frame, to support the subframe; a mounting seat formed along a horizontal plane; a fastener to fix the subframe to the mounting seat; and a reinforcing member placed to overlap with the mounting seat. The reinforcing member includes a flange, which is continuous to surround a periphery of the fastener and is arranged in a vertical direction of the vehicle, at a portion thereof closer to the subframe, and outer in the width direction, than the fastener.