Stud Pin Anisotropic Flange for Icy Road Grip and Installation
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Solution Overview
Problem
Existing stud pins with anisotropic non-arc shaped lower flanges are difficult to install correctly due to poor grip by installation devices, leading to potential misorientation and reduced braking and driving properties on icy roads.
Innovation Solution
A stud pin design featuring a lower flange with an anisotropic profile shape, including four or more first flange protrusion portions projecting in the longitudinal direction and two second flange protrusion portions projecting in the lateral direction, along with body linear portions facing between protrusion portions, to enhance grip and stability during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower flange is given an anisotropic non-arc shape to improve braking and driving properties on icy roads, then the braking and driving properties are improved, but the stud pin becomes difficult to grip and stabilize during installation
Solution Approach 1:
The lower flange is segmented into multiple protrusion portions (first protrusion portions extending in the first direction, second protrusion portions extending in the second direction) that create distinct grip zones. This segmentation allows installing fingers to engage with specific portions of the flange, providing stable orientation during installation while maintaining the anisotropic shape for improved icy road performance.
Solution Approach 2:
The lower flange employs asymmetric protrusion portions extending in different directions (first direction and second direction perpendicular to each other). This asymmetric design creates an anisotropic shape that provides both improved braking/driver properties on icy roads and specific engagement points for installing fingers, resolving the contradiction between performance and installability.
2Reliability
If the lower flange has an anisotropic shape with non-arc profile, then the stud pin prevents falling out better, but mistakes in installation occur easily due to poor grip by installing fingers
Solution Approach 1:
Different portions of the lower flange have different local qualities - the first protrusion portions extend in the first direction to prevent falling out, while the second protrusion portions extend in the second direction to provide grip points for installing fingers. This local differentiation ensures both retention and precise orientation during installation.
Solution Approach 2:
The protrusion portions act as intermediaries between the stud pin and the installing fingers. These protrusions provide mechanical engagement points that mediate the transfer of force and orientation control during installation, ensuring the stud pin is correctly oriented before being set into the tire.
3Strength
If the flange profile shape is anisotropic with protrusion portions, then the stud pin resists shear forces better, but the body portion becomes complex in shape requiring precise alignment
Solution Approach 1:
The body portion is segmented into linear portions that correspond to the protrusion portions of the lower flange. This segmentation simplifies the body profile by using straight lines rather than complex curves, while still providing the structural strength to resist shear forces and maintain alignment with the flange's anisotropic shape.
Solution Approach 2:
The body profile uses linear portions with specific orientations that match the protrusion directions of the lower flange. By changing the body profile parameters to simple linear segments aligned with the flange's principal directions, the design achieves both shear resistance and reduced complexity for easier manufacturing and alignment.
Data Source
AI summary
A stud pin includes a tip, a body portion, and a lower flange. A flange profile shape of the lower flange is an anisotropic shape includes short sides and long sides of different lengths, and includes four or more first flange protrusion portions that project in the longitudinal direction parallel with the long sides and two second flange protrusion portions that project in the lateral direction parallel with the short sides. A body profile shape of the body portion is a shape including body linear portions extending in a linear manner. The body linear portions are disposed facing a portion of the flange profile shape between two adjacent protrusion portions of the first flange protrusion portion and the second flange protrusion portion along the outer circumference of the flange profile shape.