Vehicular Resin Panel Parting Line Positioning
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Solution Overview
Problem
Conventional vehicular back door structures experience noise issues due to burrs at the parting line of resin inner panels when joined with outer panels, as the burrs can scrape against the outer panel, leading to noise and potential water ingress.
Innovation Solution
The vehicular resin panel structure features a resin inner panel with a parting line formed at a location separated from the leading end portion, which abuts the outer panel, and includes an inner sloped face with decreasing plate thickness and a circular arc cross-section, reducing contact surface area and improving joint accuracy, while the outer panel is made of resin to minimize weight and enhance strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the parting line is formed at the leading end portion of the fold portion during molding, then the manufacturing process is simplified, but burr occurs at the parting line causing noise when the inner panel abuts the outer panel
Solution Approach 1:
The harmful burr is extracted or removed from the critical area by positioning the parting line away from the leading end portion. The patent specifically designs the fold portion such that the parting line is formed at a location that does not include the leading end portion, thereby eliminating the burr source from the noise-generating area while maintaining manufacturing simplicity
Solution Approach 2:
The patent applies preliminary action by pre-positioning the parting line at a specific location during the molding design phase. The fold portion is configured with a predetermined shape where the parting line is intentionally placed away from the leading end portion, preventing burr formation at the critical abutting area before the panels are assembled
2Device complexity
If the leading end portion of the inner panel abuts the outer panel, then the joint structure is simplified, but burr at the leading end portion causes noise and potential water ingress
Solution Approach 1:
The harmful element (burr) is removed from the abutting interface by strategic parting line positioning. The fold portion design ensures that the parting line is located away from the leading end portion, so even if burr forms, it is extracted from the critical noise-generating and water-ingress-prone area
Solution Approach 2:
The fold portion acts as an intermediary element that connects the inner panel to the outer panel. By configuring the fold portion with a specific shape where the parting line is positioned away from the leading end, it mediates between the simple abutting joint structure and the requirement for noise suppression and watertight performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses noise, improves joint accuracy, and ensures watertight performance by preventing burr contact with the outer panel, while also reducing weight and enhancing the structural integrity of the back door panel.
Implementation Method 1
an inner panel main body that is joined to the outer panel main body by an adhesive
Data Source
AI summary
A vehicular resin panel structure including: an outer panel that includes an outer panel main body and an outer edge portion formed by bending an edge portion of the outer panel main body toward one side in a plate thickness direction of the outer panel main body; and a resin inner panel that includes an inner panel main body that is joined to the outer panel main body by an adhesive, and an inner edge portion that is formed by bending an edge portion of the inner panel main body toward another side in the plate thickness direction. A leading end portion of the inner edge portion abuts the outer panel main body, and a parting line during molding is formed at a location separated from the leading end portion.