Vehicle Front Structure Load Transfer Block Rib Design
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Solution Overview
Problem
The vehicle body front structure disclosed in Japanese Unexamined Patent Application, First Publication No. 2004-82932 experiences a large moment around the rear parts of the front side frames and the connection part of the load support member when an impact load is input from the front, which hinders the smooth crush of the front side frames.
Innovation Solution
A vehicle body front structure is designed with a load transfer block that connects the rear parts of the front side frames to the front part of the floor member, featuring upper reinforcement ribs on the connecting wall to efficiently receive compression loads and distribute them, ensuring rigid support and smooth crush of the front side frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load support member is positioned offset lower than the front side frames, then the impact load can be received by the load support member, but a large moment occurs around the rear parts of the front side frames and the connection part of the load support member, hindering smooth crush
Solution Approach 1:
A load transfer block is introduced as an intermediary component between the front side frames and the floor member. This block includes a frame fixing part that connects to the rear parts of the front side frames and a floor fixing part that connects to the front part of the floor member, with a connecting wall between them. The connecting wall has upper reinforcement ribs that receive compression loads, effectively mediating the load transfer and reducing the moment at the connection parts.
Solution Approach 2:
The connecting wall is designed with upper reinforcement ribs that extend in the forward/rearward direction and stand upward from the upper surface. These ribs add a vertical dimension to the load-bearing structure, creating a three-dimensional load distribution system that efficiently receives and distributes compression loads from the front side frames to the floor member.
2Reliability
If the load support member is positioned offset lower than the front side frames, then the impact load can be received, but load concentration occurs at the connection part, preventing efficient energy absorption
Solution Approach 1:
The connecting wall is divided into multiple segments by spacing apart several upper reinforcement ribs in the vehicle width direction. This segmentation distributes the compression load across multiple ribs rather than concentrating it at a single location, preventing load concentration and enabling efficient energy absorption through distributed deformation.
Solution Approach 2:
The upper reinforcement ribs are strategically positioned on the upper surface of the connecting wall to locally enhance the load-bearing capacity at critical stress points. Each rib provides localized reinforcement where compression loads are most intense, creating areas of controlled deformation that efficiently absorb energy without compromising overall structural integrity.
Data Source
AI summary
This vehicle body front structure includes a floor member disposed below a passenger compartment, front side frames extending forward from positions above the floor member in front of the passenger compartment, a dashboard lower panel standing forward and upward from a front part of the floor member and configured to cover the front of the passenger compartment, and a load transfer block that is an integrated casting part configured to connect rear parts of the front side frames and the front part of the floor member, the load transfer block having: a frame fixing part to which the rear parts of the front side frames are fixed, a floor fixing part to which the front part of the floor member is fixed, and a connecting wall extending substantially along the dashboard lower panel and configured to connect the frame fixing part and the floor fixing part, and a plurality of upper reinforcement ribs standing upward and extending in a forward/rearward direction being provided on an upper surface side of the connecting wall and spaced apart from each other in a vehicle width direction.