Side Cowl Top Cover Hook Design for Mold Freedom
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Solution Overview
Problem
Existing side cowl top cover designs face challenges in facilitating mold design flexibility and shape diversity due to the presence of undercut portions, which restrict the placement of V-shaped and rectangular pawls on the same plane, and struggle with water retention issues that can lead to improper attachment.
Innovation Solution
A side cowl top cover design featuring a hook with a holder and vertical rib structure where the bottom surfaces are on the same plane, eliminating undercut portions and allowing for enhanced mold design freedom, along with a curved lower portion to improve water drainage and attachment stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a V-shaped pawl and a rectangular pawl are placed on the same plane to meet design requirements, then the degree of freedom for designing the shape is improved, but an undercut portion is formed that complicates mold design and requires additional slide-type molds
Solution Approach 1:
The hook is designed to extend in the depthwise direction (third dimension) from the front surface of the cover body, rather than placing both pawls on the same plane. This dimensional transition allows the V-shaped pawl and rectangular pawl to be positioned at different depths, eliminating the undercut portion while maintaining the ability to engage with components on the same plane, thus resolving the contradiction between design freedom and mold complexity
Solution Approach 2:
The holder is positioned inside the cover body at a recessed location, with the hook extending from the front surface. This nested arrangement allows the rectangular pawl (holder) to be housed within the cover body structure while the V-shaped pawl extends outward, enabling both pawls to function on the same plane without creating external undercuts that would complicate mold design
2Ease of manufacture
If the rectangular pawl is placed sufficiently apart from the V-shaped pawl in the depthwise direction to avoid collision with the slide-type mold, then mold collision is prevented, but the design freedom for shaping the top cover is restricted
Solution Approach 1:
The holder (rectangular pawl) is nested inside the cover body at a recessed position, while the V-shaped pawl extends from the front surface. This nested configuration allows both pawls to be positioned such that they do not interfere with the slide-type mold during demolding, eliminating the need to place them far apart in the depthwise direction, thus maintaining design freedom while preventing mold collision
3Object-affected harmful factors
If rain water remains at the hook structure, then water retention occurs that can freeze and expand, but the space between the end face of the extended portion and the holder is completely opened in the vertical direction, allowing rain water to drain freely
Solution Approach 1:
The lower portion of the vertical wall is formed with a curved surface that slopes downward toward the front surface of the cover body. This curvature creates a self-draining profile that prevents rain water from accumulating at the hook structure, allowing water to naturally drain away due to gravity, thus eliminating water retention and freezing issues without adding complex drainage components
Data Source
AI summary
A side cowl top cover includes a cover body and a hook formed so as to expand at an upper portion of the cover body in order to be engaged with the end flange. The cover body includes: a vertical wall that extends upwardly from a lower side of the windshield; and an extended portion extended from an upper end of the vertical wall toward the front fender. The hook includes: a holder placed at a predetermined gap relative to an end face of the extended portion and extended substantially in parallel with the end face of the extended portion; and a vertical rib extended in a direction intersecting with the direction in which the holder extends, and interconnecting a bottom surface of the extended portion and a bottom surface of the holder.