Vehicle Window Glass Corner Molding to Suppress Sink Marks
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Solution Overview
Problem
Window glass for vehicle windows experiences cracking or distortion at sharp corners due to material processing, and while shortening the inner edge portion can prevent cracking, it often results in undesirable sink marks on the resin molding surface.
Innovation Solution
A window glass design featuring a glass plate with a resin molding and a design member that covers the corner, incorporating an insert member or gas bubble portion within the resin molding, where the insert member or gas bubble diameter is larger than the distance from the glass plate to the inner edge of the design member, effectively suppressing sink marks while maintaining design integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the design member is shaped to match the sharp corner angle, then the design property is improved, but cracking or distortion occurs at the inner edge portion
Solution Approach 1:
An insert member is introduced as an intermediary component between the resin molding and the design member at the corner region. This insert member has a shape that matches the corner angle and provides structural support, preventing the design member from cracking or distorting while maintaining the desired sharp corner appearance.
Solution Approach 2:
The corner structure uses a composite construction combining the resin molding, the insert member (made of different material properties), and the design member. This composite approach allows each component to fulfill its specific function - the resin provides the base structure, the insert provides corner-specific support, and the design member provides the aesthetic finish.
2Strength
If the inner edge portion of the design member is shortened to prevent cracking, then cracking and distortion are suppressed, but sink marks are generated on the resin molding surface
Solution Approach 1:
The insert member serves as a mediator that fills the corner region of the resin molding. By providing this intermediate structure, the insert member prevents sink marks from forming on the resin molding surface while allowing the design member to maintain its proper length and shape without cracking.
3Shape
If one design member is used to cover the corner, then the design property is improved, but the manufacturing complexity increases due to shaping requirements
Solution Approach 1:
The corner covering function is segmented into multiple components: the insert member that matches the corner angle and the design member that provides the aesthetic finish. This segmentation allows each component to be manufactured more easily with simpler shaping requirements, while together they achieve the desired corner coverage and design property.
Data Source
AI summary
To provide a window glass for a vehicle window, capable of suppressing generation of sink marks in a resin molding while securing the design property of a design member. A window glass for a vehicle window according to the present disclosure includes a glass plate; and a resin molding provided in a peripheral edge portion of the glass plate. The glass plate and the resin molding constitute an integrated article. The window glass for a vehicle window further includes a design member that covers a corner of the resin molding. The design member is arranged at a vehicle outside of the resin molding when the window glass for a vehicle window is attached to a vehicle. The corner has a sharp angle. An insert member or a gas bubble portion is provided inside the corner of the resin molding.