Flexible Metal-Polymer Wheel Weights for Rim Conformance
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Solution Overview
Problem
Existing vehicle wheel weights face environmental concerns, inflexibility, and inadequate adherence to wheel geometry, leading to suboptimal rotational balance and frequent rebalancing needs.
Innovation Solution
A composite material comprising strain hardening thermoplastic polyolefin elastomer and interfacially modified metal particulates, coated with a thin interfacial modifier, allowing for high density, flexibility, and precise adherence to wheel rims using a pressure-sensitive adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional lead weights or metallic weights are used, then high density is achieved, but environmental harm and inflexibility occur
Solution Approach 1:
The patent uses a composite material system consisting of metal particulates (providing density) dispersed in a thermoplastic elastomer matrix (providing flexibility and environmental compatibility). This composite approach allows the wheel weight to achieve high density from the metal particles while the polymer matrix provides flexibility and eliminates the environmental hazards associated with pure lead or metallic weights.
2Temperature
If metallic weights are used, then high density is achieved, but flexibility and adherence to wheel geometry are lost
Solution Approach 1:
The composite structure combines rigid metal particulates for density with a flexible thermoplastic elastomer matrix that can conform to various wheel rim geometries. The polymer matrix accommodates the metal particles while providing the necessary flexibility to adapt to different wheel shapes and sizes, enabling proper placement and adherence.
Solution Approach 2:
The invention applies different material properties to different components: metal particulates provide localized density where needed, while the thermoplastic elastomer matrix provides localized flexibility and conformability to the wheel surface. This local differentiation of material properties allows the composite to simultaneously achieve high density and geometric adaptability.
3Adaptability or versatility
If the composite material is made flexible, then adherence to wheel geometry is improved, but adhesive bonding strength may be compromised
Solution Approach 1:
The patent utilizes the temperature-dependent properties of thermoplastic elastomers. During application, the material is heated to become soft and pliable, allowing it to conform to the wheel geometry and be pressed into place. Upon cooling, the material solidifies and maintains its shape while preserving strong adhesive bonding to the rim surface. This parameter change with temperature resolves the contradiction between flexibility and bonding strength.
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 composite material provides a flexible, environmentally friendly wheel weight that maintains precise balance by adhering to various wheel geometries, ensuring long-term rotational stability without contamination or premature adhesion, facilitating easy application and removal.
Implementation Method 1
The composite uses a metallic particulate with a coating of an interfacial modifier combined with a strain hardening thermoplastic polyolefin elastomer
Implementation Method 2
The term 'strain hardening' means the increase in stress that accompanies increase in strain in plastic deformation beyond the strength at yield point
Implementation Method 3
The weight must obtain sufficient flexibility such that the wheel weight can adhere to the rim with substantial adhesive (peel) strength
Data Source
AI summary
A material comprising a metal particulate having an interfacial modifier coating and a strain hardening thermoplastic polyolefin elastomer. The composite can be extruded into a variety of cross-sectional shapes and can be formed into a flexible adhesive wheel weight that can be used to rotationally balance vehicle wheels.