Vehicle Rear Side Frame Close Plate Ridge Line Design
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Solution Overview
Problem
The existing vehicle body rear part structure struggles to efficiently transmit impact loads from the rear side frame to the side sill without causing irregular bend deformations, due to the straight inner side wall of the rear side frame preventing the formation of a straight ridge line on the close plate.
Innovation Solution
The vehicle body rear part structure incorporates a close plate with an outer ridge line extending forward and an inner ridge line curving along the inner side wall, both converging at the joint part of the rear side frame and side sill, along with auxiliary ridge lines to distribute the impact load effectively, and a close plate joined to the side sill and cross members for enhanced load transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the inner side wall of the rear side frame is curved along the outer side wall, then the rear side frame can follow the curve shape of the rear wheel house, but a straight ridge line cannot be formed on the close plate and impact load transmission is inhibited
Solution Approach 1:
The patent divides the ridge line structure into multiple segments: an outer ridge line extending straight from the outer side wall, and an inner ridge line curving along the inner side wall. These segmented ridge lines work together to transmit impact loads effectively while accommodating the curved shape of the rear side frame.
Solution Approach 2:
The patent introduces a vertical dimension by forming ridge lines that extend in the vehicle forward/rearward direction (third dimension) while maintaining the curved horizontal profile. This allows the close plate to transmit loads along the vertical ridge line structures even when the horizontal geometry is curved.
2Reliability
If the inner side wall extends straight forward, then a straight ridge line can be formed for efficient load transmission, but the rear side frame cannot follow the curve shape of the rear wheel house
Solution Approach 1:
The ridge line system is segmented into two functional parts: the outer ridge line that provides straight load transmission path from the outer side wall, and the inner ridge line that adapts to the curved inner side wall geometry. This segmentation allows each part to optimize for its specific function.
Solution Approach 2:
Different regions of the close plate are given different ridge line configurations tailored to their local requirements: the outer region has a straight ridge line for efficient load transmission, while the inner region has a curved ridge line that follows the local geometry of the rear side frame.
Data Source
AI summary
A vehicle body rear part includes a side sill, a rear wheel house, a rear side frame, and a close plate. An outer curve part and an inner curve part are provided in a region close to a front part of the rear wheel house of the rear side frame. An outer ridge line that extends straight in a vehicle forward direction from a position substantially directly above the vicinity of a rear end portion of the outer curve part of the rear side frame and an inner ridge line that extends to be curved to a vehicle forward side substantially along the inner curve part at a position substantially directly above the inner curve part of the rear side frame are provided on the close plate. The outer ridge line and the inner ridge line converge in an inner region in the vehicle width direction of a joint part of the rear side frame and the side sill.