Rear Vehicle-Body Structure with Spaced Upper and Lower Frames
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Solution Overview
Problem
Existing rear vehicle-body structures face challenges in enhancing the support rigidity of rear suspensions and efficiently transmitting rear-end collision loads to the vehicle front side, particularly in sports cars, where the current configurations of connecting frames do not fully optimize load transmission efficiency.
Innovation Solution
A rear vehicle-body structure design featuring upper and lower frames that connect the rear side housing to the side sill and pillar, with inclined angles and a single-member configuration, including a step portion and raised walls, to securely transmit loads and enhance support rigidity and collision load transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple connecting frames are disposed between rear side housings and side sills with spaced joined portions, then load transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The connecting frame is divided into multiple segments (first connecting frame and second connecting frame) that are spaced apart in the vehicle width direction. Each segment independently transmits loads, creating multiple load transmission paths that improve reliability without requiring complex integration mechanisms.
Solution Approach 2:
The joined portions are positioned at different locations in the vehicle width direction (outer side and inner side), utilizing the width dimension to create spatial separation. This dimensional approach allows multiple connection points without increasing complexity in other dimensions, improving load distribution.
2Reliability
If rear portions of connecting members are coupled to different rigidity members, then load reception capability is improved, but manufacturing complexity increases
Solution Approach 1:
Different portions of the connecting frame are coupled to different rigidity members (horizontal frame portion and lower arm supporting member) based on their specific load reception capabilities. This local optimization allows each connection point to utilize the strengths of specific structural members, improving overall load reception.
Solution Approach 2:
The connecting frame structure serves multiple functions: it connects rear side housings to side sills, transmits rear-end collision loads, supports lower arms, and utilizes existing rigidity members for load reception. This multi-functionality reduces the need for additional specialized components.
3Reliability
If joined portions are spaced apart in vehicle width direction, then load transmission paths are optimized, but structural complexity increases
Solution Approach 1:
The connecting frame is segmented into multiple sections spaced in the vehicle width direction, creating distinct load transmission paths. The first and second connecting frames are positioned at different width locations, allowing independent load routes that improve transmission efficiency.
Solution Approach 2:
Multiple connecting frames are merged into a single integrated structure that spans across different width positions. This merging approach consolidates multiple connection functions into one structural element, reducing overall complexity while maintaining spaced joined portions.
Data Source
AI summary
Upper frames and a lower frame that connect a rear end of a coupled body composed of a side sill and a rear pillar and a rear side housing to each other are spaced apart in a vehicle up-down direction. An inclined angle at which a lower frame is inclined to be closer to a vehicle inner side toward a vehicle rear side is larger than inclined angles at which the upper frames are inclined to be closer to the vehicle inner side toward the rear side. A lower joined portion to which a rear end of the lower frame is joined is on a vehicle-width-direction inner side with respect to an upper joined portion in the rear side housing, which is composed of a single member including at least the lower frame rear-end joined portion, and the first and second upper frame rear-end joined portions, and extending therebetween.