Die-Cast Rear Body Structure With Forward Rear Frame Coupling

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Solution Overview

Problem

The integration of rear frames with a die-cast rear floor body structure results in an increased vehicle body length, leading to weight gain and reduced design flexibility.

Innovation Solution

A vehicle body rear structure with rear wheel housing parts and rear frame coupling parts integrated by die-cast molding, featuring bulged parts inward in the vehicle width direction and rear frame coupling parts positioned in front of the bulged parts, along with a rear floor panel part and ribs for improved rigidity and load transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If rear frames are coupled to the die-cast rear floor body structure at a rear of the rear wheel covers, then the vehicle body rear structure provides sufficient coupling strength and structural stability, but the entire length of the vehicle body becomes longer, increasing weight and reducing design flexibility

Engineering Contradiction:

Improvecoupling strengthVSAvoidvehicle body length

Core Design Contradiction:

StrengthVSLength of moving object

Solution Approach 1:

The patent positions the rear frame coupling parts in the vehicle width direction rather than extending the vehicle length. By placing coupling parts at the inner ends of bulged parts in the width direction, the design shifts from a length-extension approach to a width-utilization approach, thereby maintaining coupling strength while reducing rear overhang

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Instead of extending the vehicle body rearward to accommodate coupling parts, the patent inverts the approach by positioning coupling parts forward at the inner ends of bulged parts. This inversion allows the rear frames to be coupled without increasing the overall vehicle body length, thus reducing weight while maintaining structural integrity

Inventive Principle:

Principle #13The other way round (Inversion)

2Stability of the object's composition

If rear frames are coupled at the rear of the rear wheel covers, then structural stability is improved, but design flexibility of the vehicle body is reduced

Engineering Contradiction:

Improvestructural stabilityVSAvoiddesign flexibility

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by creating bulged parts with inwardly protruding coupling parts at specific locations. This localized structural feature provides stable coupling points without requiring a uniform extension of the vehicle body, thereby maintaining structural stability while preserving design flexibility for various vehicle configurations

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The rear wheel housing parts are segmented with distinct bulged parts that contain coupling parts. This segmentation allows independent optimization of coupling locations without affecting the entire vehicle body structure, enabling flexible design while maintaining local structural stability for frame coupling

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260062064A1Vehicle body rear structure

Publication Date: 2026.03.05 HONDA MOTOR CO LTD

AI summary

A vehicle body rear structure includes rear wheel housing parts and a rear floor panel part having rear frame coupling parts to be coupled with rear frames, which are integrally provided by die-cast molding. The rear wheel housing parts include bulged parts which are bulged inward in a vehicle width direction to cover rear wheels, and at least a part of the rear frame coupling parts is arranged in front of rear ends of the bulged parts.