Asymmetric Base Stud Pin for Tire Retention
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Solution Overview
Problem
Conventional stud pins with trapezoidal bodies in a plan view have variable adhesion with tire pin holes, leading to a high likelihood of falling out when force is applied from the road surface.
Innovation Solution
A stud pin with a cylindrical body and an asymmetrically formed arc-shaped base that aligns with the tire's pin hole center axis, providing enhanced retention and resistance against falling off, and a tapered surface for reduced road surface impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a trapezoidal body is used in the stud pin, then the structure is simple to manufacture, but the adhesion with pin holes becomes variable and the stud pin is likely to fall out
Solution Approach 1:
The base is designed with an asymmetric shape featuring an arc-shaped portion that conforms to the curved inner surface of the pin hole. This asymmetric configuration provides consistent adhesion and prevents the stud pin from rotating or falling out, while the arc-shaped base can be efficiently manufactured using injection molding or die casting processes.
2Reliability
If the base is formed asymmetrically in the longitudinal axis direction, then the resistance against falling off is improved in specific direction, but the manufacturing complexity increases
Solution Approach 1:
The asymmetric design is applied locally only to the base portion that contacts the pin hole, specifically the arc-shaped configuration. The body and other components maintain simple geometric shapes. This localized application of complexity achieves the required directional retention while minimizing overall manufacturing complexity.
Data Source
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AI summary
Provided is a stud pin including: a cylindrical body 2; a shaft 5 which protrudes from one end in a center axis direction of the body 2; and a base 4 arranged on the other end in the center axis direction of the body 2, which the base 4 is, in a plan view, formed asymmetrically, with respect to a transverse axis perpendicular to a center axis L of the body 2, in a longitudinal axis direction perpendicular to the center axis L and the transverse axis, and includes an arc-shaped part 12, which is centered on the center axis L, on the one end side in the longitudinal axis direction.