Hole Plug Abutting Structure to Prevent Over-Insertion
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Solution Overview
Problem
Existing hole plugs can deform and pass through burring holes when pushed too forcefully, leading to improper attachment in attachment members.
Innovation Solution
A hole plug design featuring a tubular outer periphery wall, an annular flange portion, a pawl portion that engages with the burring hole, a closure portion to seal the hole, and an abutting portion that overlaps with the burring hole's edge to prevent deformation and passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the hole plug is pushed more strongly than necessary into the burring hole, then the insertion depth increases, but the flange portion deforms and is dragged into the interior of the burring hole, causing the hole plug to pass through the burring hole
Solution Approach 1:
The abutting portion is designed to preemptively contact the periphery edge portion of the burring hole before excessive insertion can occur. This preliminary contact creates a mechanical stop that prevents the flange portion from deforming and being dragged into the hole, thereby counteracting the harmful effect of over-insertion before it happens.
Solution Approach 2:
The abutting portion is positioned to overlap with the periphery edge portion of the burring hole in advance, creating a pre-positioned mechanical barrier. This preliminary arrangement ensures that when insertion force is applied, the abutting portion will engage the hole edge first, preventing excessive insertion and flange deformation before they can occur.
2Length of moving object
If the hole plug is pushed more strongly than necessary into the burring hole, then the insertion depth increases, but the hole plug passes through the burring hole
Solution Approach 1:
The abutting portion creates a preliminary mechanical barrier that contacts the periphery edge portion of the burring hole before excessive insertion can occur. This prevents the hole plug from passing through the hole, thereby maintaining attachment reliability while still allowing proper insertion depth to be achieved.
Solution Approach 2:
The abutting portion is pre-positioned to overlap with the periphery edge portion of the burring hole, creating an advance warning mechanism. When insertion is attempted, the abutting portion engages the hole edge first, providing immediate feedback and physical prevention of over-insertion, thus ensuring reliable attachment.
3Length of moving object
If the hole plug is pushed more strongly than necessary into the burring hole, then the insertion depth increases, but the flange portion deforms
Solution Approach 1:
The abutting portion is designed to contact the periphery edge portion of the burring hole before excessive insertion force can deform the flange portion. This preliminary mechanical engagement creates a stop that prevents further insertion, thereby protecting the flange portion's shape while still allowing adequate insertion depth.
Solution Approach 2:
The abutting portion is pre-positioned to overlap with the periphery edge portion of the burring hole, creating a pre-established mechanical barrier. When insertion force is applied, the abutting portion engages the hole edge first, preventing the transmission of excessive force to the flange portion and thus preserving its shape.
Data Source
AI summary
A hole plug includes: a tubular outer periphery wall portion for insertion into a burring hole formed in an attachment member; an annular flange portion that protrudes toward a radial direction outer side of the outer periphery wall portion, from an end portion side of the outer periphery wall portion at an opposite side from an insertion direction side of the outer periphery wall portion; a pawl portion that projects toward the radial direction outer side from the outer periphery wall portion; a closure portion that extends between inner sides of the outer periphery wall portion; and an abutting portion provided at at least one of the flange portion or the outer periphery wall portion, the abutting portion overlapping with a periphery edge portion of the burring hole as seen in the insertion direction, and the abutting portion configured to abut the periphery edge portion.