Clip Pin Structure for Shear-Resistant Watertight Bumper Mounting
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Solution Overview
Problem
The existing clip structures for mounting bumpers to vehicle bodies are prone to deformation and loss of waterproof integrity due to shear forces applied when the bumper retainer shifts, leading to a lack of high shear strength and watertightness.
Innovation Solution
A clip structure featuring a grommet member with a projecting ring-shaped portion and a pin member with a recessed groove and support portion, where the pin's support portion contacts the projecting portion to prevent inclination, and a ribbed leg portion for increased rigidity, ensuring high shear strength and watertight sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the grommet is moved due to bumper load or external force, then the pin is subjected to shear force, but the pin deforms and loses shear strength
Solution Approach 1:
The pin member is segmented into distinct functional portions: a shaft portion for insertion, a support portion for contact with the projecting portion, and a flange portion for sealing. This segmentation allows each portion to specialize in resisting specific forces, with the support portion specifically designed to prevent inclination and maintain shear strength under load.
Solution Approach 2:
The support portion extends in a direction crossing the shaft portion, adding a dimensional element that prevents inclination of the pin. This cross-directional support structure resists shear forces by distributing loads across multiple axes, preventing the pin from deforming under bumper loads or external forces.
2Ease of manufacture
If the pin structure is simplified for ease of manufacture, then the waterproof function may be compromised
Solution Approach 1:
The support portion and flange portion are integrated as a single continuous structure on the pin member. This merging eliminates the need for separate components while maintaining both the structural support function (preventing inclination) and the sealing function (waterproofing), thereby simplifying manufacture without compromising reliability.
Solution Approach 2:
The pin member is designed with multi-functionality: the shaft portion provides insertion and engagement, the support portion prevents inclination and resists shear forces, and the flange portion ensures waterproof sealing. This universal design consolidates multiple functions into a single component, easing manufacture while maintaining reliability.
3Reliability
If the grommet member shifts from the mounting member, then the leg portion experiences stress, but the connection reliability deteriorates
Solution Approach 1:
The support portion is positioned to preemptively counteract inclination forces before they can cause significant stress on the leg portion. By providing cross-directional support that prevents the pin from tilting, the structure anticipates and resists shear forces, maintaining connection stability even when the grommet shifts under bumper loads or external forces.
Data Source
AI summary
A clip structure and a pin member that have a high shear strength are provided. A grommet member includes a projecting portion, which has a ring shape or a cylindrical shape where an insertion hole is centered and which projects, around the periphery of the insertion hole, from the opposite side of a seat portion from leg portions. On the other hand, a pin member includes a recessed groove portion, which has a ring shape whose part is formed by a support portion, which has a ring shape or a cylindrical shape and is connected, on an extension of a shaft portion, between a middle portion of the shaft portion and a flange portion. The projecting portion is inserted into the recessed groove portion behind the seat portion. In the recessed groove portion, the side of the support portion faces the projecting portion behind the seat portion.