Check Link Stopper Curved Surface Load Dispersion
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Solution Overview
Problem
Existing check link apparatuses face issues with the strength and durability of the stopper portion, leading to potential separation of the resin material from the metal core due to concentrated loads, and high production costs due to complex bending and cutting processes.
Innovation Solution
A check link apparatus with a stopper core portion that expands in the width direction, featuring a curved surface on the end face covered with resin material to disperse loads and prevent separation, and a design that allows the stopper portion to be formed from a single sheet of steel, enhancing workability and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stopper portion is formed by bending an expanded portion of a metal core and covering it with resin material, then the strength of the metal core at the stopper portion is increased, but the resin material may separate from the stopper portion due to concentrated load impact
Solution Approach 1:
The patent applies curvature to the end face of the stopper core portion by providing a curved surface that extends in the thickness direction of the metal core. This curved surface configuration disperses the load applied by the holding member across a wider area rather than concentrating it at corner portions, preventing resin material separation while maintaining structural strength.
2Reliability
If the vertical dimension of the stopper portion is increased to prevent resin material separation, then the load receiving area is increased and angle difference is decreased, but the stopper portion becomes enlarged
Solution Approach 1:
Instead of increasing the vertical dimension, the patent uses a curved surface on the end face of the stopper core portion. This curved surface extends in the thickness direction of the metal core, dispersing loads effectively without requiring additional vertical space, thus preventing resin separation while avoiding enlargement of the stopper portion.
3Strength
If the projecting portion is formed by bending the expanded portion formed by cutting a sheet material, then the strength is increased, but the workability is deteriorated and production costs increase
Solution Approach 1:
The curved surface is formed directly on the end face of the stopper core portion during the sheet metal forming process, eliminating the need for separate bending operations to create projecting portions. This approach maintains strength while significantly improving workability and reducing production costs by simplifying the manufacturing process.
Data Source
AI summary
A cheek link apparatus includes an arm in which a stopper portion is formed by covering a stopper core portion with a resin material and a holding member which defines a full open position of a door by being brought into abutment with the stopper portion. The stopper core portion has curved surfaces on end faces which face an abutment surface of the holding member at least when the abutment surface of the holding member is brought into abutment with the stopper portion. The stopper core position is positioned such that extensions extending in a direction in which a load is applied to the stopper core portion by the holding member pass the curved surfaces.