Rear Hatch Wiper Bracket Structure for Collision Load Durability
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Solution Overview
Problem
Conventional opening and closing members with lateral reinforcement struggle to withstand long-term loads applied during wiper operation and vehicle collisions, leading to reduced durability and an imbalance in occupant protection structures.
Innovation Solution
The design incorporates a wiper bracket member with a protruding part aligned with the inner panel's bracket attaching part, featuring fixing parts, a cut-out part, ribs, and a flange part to distribute loads and enhance stiffness, while allowing for the attachment of a liner material, thereby increasing strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If only lateral reinforcement provides support against loads, then the structure is simple, but the housing cannot withstand long-term loads and durability decreases
Solution Approach 1:
The patent combines the wiper bracket member with the inner panel by aligning and integrating their ridge lines, creating a unified load-bearing structure. This merging allows the inner panel to actively participate in supporting loads, transforming the previous structure where only lateral reinforcement provided support into a composite structure where multiple components work together, thereby improving both strength and durability without significantly increasing complexity
Solution Approach 2:
The patent creates a composite structure by integrating the wiper bracket member (metal) with the inner panel (resin or plastic). The aligned ridge lines form a composite load-bearing system that combines the high strength of metal with the formability and weight advantages of resin, achieving enhanced durability and load-bearing capacity while maintaining a balanced occupant protection structure
2Reliability
If the housing structure is strengthened to withstand collision loads, then occupant protection is improved, but the structure becomes more complex and heavier
Solution Approach 1:
The patent merges the load-bearing functions into an existing structural component (the inner panel) by aligning its ridge lines with the wiper bracket member. This integration allows the inner panel to contribute to collision load support without adding separate reinforcement structures, thereby improving occupant protection capability while avoiding increased structural complexity
Solution Approach 2:
The inner panel is designed to serve multiple functions: it provides the housing structure, supports the wiper bracket member through aligned ridge lines, and actively participates in withstanding both operational loads and collision loads. This multi-functionality allows the same component to contribute to occupant protection without requiring additional specialized structures
Data Source
AI summary
An opening and closing member is attachable to a rear opening of a vehicle body in an openable and closable manner. The opening and closing member includes an inner panel disposed to face a vehicle body inner side and a wiper bracket member via which a wiper is attached to an inner side of the inner panel. The inner panel has a bracket attaching part protruding toward the vehicle body inner side. The wiper bracket member has a protruding part protruding toward the vehicle body inner side. The wiper bracket member is attached to the bracket attaching part such that a ridge line of the protruding part is aligned with a ridge line of the bracket attaching part.