Decorative Wheel Fastener Cap for Corrosion-Resistant Torque Transfer
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Solution Overview
Problem
Vehicle wheel fasteners are susceptible to corrosion in wet and salty environments, which detracts from their aesthetic appearance and functional reliability.
Innovation Solution
A wheel fastener design featuring a decoupled cap with a decorative black chrome coating that covers the wrenching surface without affecting the load-bearing surfaces, combined with a crimping mechanism to secure the cap in place, ensuring corrosion resistance and aesthetic appeal while maintaining friction control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the entire fastener body is coated with decorative coating to improve aesthetics, then the aesthetic appearance is improved, but the load-bearing capability and friction control are compromised
Solution Approach 1:
The fastener is divided into two separate components: a functional fastener body and a decorative cap. The cap is decoupled from the fastener body, allowing independent treatment of aesthetic and functional requirements. The cap can be coated with decorative finishes without affecting the fastener body's load-bearing surfaces.
Solution Approach 2:
Different parts of the fastener assembly have different surface qualities. The fastener body maintains a functional surface finish for load-bearing and friction control, while the cap provides a decorative surface finish for aesthetic appearance. Each component is optimized for its specific function.
2Reliability
If the fastener body is coated with corrosion-resistant coating to prevent corrosion, then corrosion resistance is improved, but the aesthetic appearance on visible surfaces is compromised
Solution Approach 1:
The separation of the cap from the fastener body allows the cap to provide both corrosion resistance and aesthetic appearance simultaneously, while the fastener body focuses on functional performance. The cap can be made of corrosion-resistant material and coated with aesthetic finishes without compromising the fastener's functional surfaces.
Solution Approach 2:
The cap acts as an intermediary component that protects the fastener body from corrosion while providing aesthetic coverage of visible surfaces. The cap covers the wrenching surface and upper portions of the fastener body, shielding them from corrosive environments and providing a decorative appearance.
3Illumination intensity
If a cap is added to cover the wrenching surface for aesthetic purposes, then the aesthetic appearance is improved, but the device complexity increases
Solution Approach 1:
The cap combines multiple functions into a single component: it provides aesthetic coverage of the wrenching surface, protects against corrosion, and can be secured through simple crimping. The flange on the cap integrates the attachment mechanism, reducing the need for additional fastening components.
Solution Approach 2:
The cap can be designed as a thin-walled structure that is easy to form and attach. The crimping mechanism uses simple deformation of the cap's material to secure it to the fastener body, avoiding complex assembly processes or additional fastening elements.
4Reliability
If the cap is securely crimped to the fastener body to prevent corrosion exposure, then corrosion resistance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The crimping process utilizes material property changes through plastic deformation. The cap material is deformed beyond its elastic limit to create a permanent interference fit with the fastener body, ensuring secure attachment and corrosion protection without requiring ultra-precise dimensional control.
Solution Approach 2:
The cap includes a dedicated flange section that is specifically designed for crimping. This segmentation of the cap into a decorative portion and an attachment portion allows the crimping operation to focus on a specific area, reducing the overall precision requirements for the entire cap assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents corrosion on visible surfaces, maintains the aesthetic appearance, and ensures reliable torque transmission without compromising the fastener's load-bearing capabilities, addressing both aesthetic and functional concerns.
Implementation Method 1
the decorative coating has a black chrome coating with a nickel strike layer and a black chrome passivation layer
Implementation Method 2
The cap is crimped to the fastener body to retain the cap on the fastener body
Data Source
AI summary
A wheel fastener and method of forming a wheel fastener is provided. The wheel fastener has a fastener body comprising a threaded portion and an upper portion opposite the threaded portion. A load-bearing surface of the fastener body is shaped to cooperate with a fastener seat. A cap is decoupled from the fastener body and has a coating covering a cap base material to define a decorative appearance surface. The cap is crimped to the upper portion at a crimp area to retain the cap on the fastener body and define a wrenching surface. The cap does not cover the load-bearing surface. The coating of the cap comprises applying a nickel strike layer and a black chrome passivation layer to define a black appearance surface.