Vehicle Lower Frame Guide Projections Reduce Insertion Friction
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Solution Overview
Problem
Existing vehicle body lower portion structures face difficulties in inserting reinforcing members due to high frictional forces, which complicates the produceability and affects collision safety performance.
Innovation Solution
The structure incorporates a lower frame member with a guide portion and a reinforcing member with projections that contact the guide portion during insertion, reducing friction and improving produceability, while also overlapping with the battery frame to enhance collision safety by distributing collision loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the reinforcing member is inserted into the chamber of the lower frame member with the outer surfaces of wall portions contacting the guide portion, then the positioning accuracy is improved, but the frictional force increases making insertion difficult
Solution Approach 1:
The outer surface of the reinforcing member is segmented into multiple projections rather than a continuous surface. These projections contact the guide portion at discrete points, reducing the total contact area and frictional force while maintaining positioning accuracy through the distributed contact points.
Solution Approach 2:
The contact interface is modified to have non-uniform local quality - the projections concentrate contact at specific locations rather than distributing it uniformly across the entire outer surface. This localizes the interaction to reduce friction while preserving the guiding function at critical positions.
2Reliability
If the reinforcing member overlaps with the battery or battery frame in side view, then the collision safety is improved by transmitting collision load, but the device complexity increases
Solution Approach 1:
The reinforcing member is positioned to overlap with the battery frame structure, merging the load-bearing functions of both components. The reinforcing member and battery frame work together as an integrated load transmission path during side collisions, improving safety without requiring separate dedicated load transmission components.
Solution Approach 2:
The reinforcing member serves multiple functions: it provides structural reinforcement to the lower frame member, guides insertion during assembly, and transmits collision loads to the battery frame. This multi-functionality improves collision safety without increasing overall structural complexity.
Data Source
AI summary
A vehicle body lower portion structure includes: a lower frame member formed as a chamber that extends in a vehicle body longitudinal direction, having a guide portion at inner surfaces of wall portions that structure the chamber, the lower frame member being disposed at a vehicle body lower side; and a reinforcing member formed as a second chamber that extends in the vehicle body longitudinal direction, having a plurality of projections at outer surfaces of wall portions that structure the second chamber, the reinforcing member being provided within the chamber of the lower frame member in a state in which the plurality of projections are made to contact the guide portion.