Polymeric Composite Thermal Expansion Reduction in Metal Assemblies
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Solution Overview
Problem
The use of lightweight metal components in automotive systems leads to uneven thermal expansion due to their high linear coefficients of thermal expansion, causing performance issues and reduced fuel efficiency, particularly in bearing assemblies where traditional materials with lower expansion coefficients are present.
Innovation Solution
Incorporating a polymeric composite structure with a lower coefficient of linear thermal expansion into mechanical interlock features on lightweight metal components to reduce thermal expansion and minimize separation from adjacent components with different thermal expansion coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lightweight metal components (aluminum, magnesium) are used to reduce vehicle weight, then fuel economy improves, but linear thermal expansion increases causing uneven thermal expansion and performance loss
Solution Approach 1:
The patent applies composite materials by bonding a metal component (with high CLTE) to a polymeric composite structure (with low CLTE). This composite assembly creates an effective CLTE that matches adjacent components, resolving the thermal expansion instability while maintaining the weight benefits of lightweight metals.
Solution Approach 2:
The patent changes the effective thermal expansion parameter of the metal component by attaching a polymeric composite with different thermal properties. This modifies the overall thermal behavior of the assembly without changing the base metal component, allowing weight reduction while controlling thermal expansion.
2Weight of moving object
If components with different linear coefficients of thermal expansion are assembled together, then weight reduction is achieved, but bearing clearance and preload stability deteriorate due to uneven thermal expansion
Solution Approach 1:
The patent creates a composite structure combining metal and polymeric composite materials with different CLTEs. The polymeric composite layer compensates for the metal's high thermal expansion, maintaining stable bearing clearance and preload across temperature variations while keeping the component lightweight.
Solution Approach 2:
The patent applies the polymeric composite material locally to specific surfaces of the metal component where thermal expansion control is critical. This localized application stabilizes the interface with adjacent components without requiring the entire component to be made of heavy materials.
3Stability of the object's composition
If traditional materials (steel, ceramic) are used for bearing components, then thermal expansion stability is maintained, but vehicle weight increases reducing fuel efficiency
Solution Approach 1:
The patent uses composite materials to achieve the thermal expansion stability of traditional materials while maintaining the weight advantages of lightweight metals. The polymeric composite structure bonded to the metal component creates an assembly with steel-like or ceramic-like CLTE without the associated weight penalty.
4Reliability
If polymeric composite structure is attached to lightweight metal component, then thermal expansion is reduced and bearing preload is stabilized, but device complexity increases
Solution Approach 1:
The patent integrates the polymeric composite structure directly onto the metal component to form a bonded composite assembly. This approach stabilizes preload and thermal expansion in a single integrated solution rather than requiring separate adjustment mechanisms or complex multi-component systems.
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
This approach stabilizes bearing preloads, improves fuel economy, reduces drag loss, and enhances gear stiffness and noise reduction by effectively managing thermal expansion in automotive systems with components of varying thermal expansion coefficients.
Implementation Method 1
these metals also have relatively high linear coefficients of thermal expansion, as compared to traditional steel or ceramic materials
Implementation Method 2
forming one or more mechanical interlock features disposed along discrete discontinuous regions in a first planar metal component
Data Source
AI summary
Methods of producing an assembly, e.g., a bearing assembly, for a vehicle, with reduced thermal expansion in a linear direction as well as methods for minimizing linear thermal expansion in an assembly, are provided. The assembly has at least two components with substantially different linear coefficients of thermal expansion (CLTEs). The assembly has a lightweight planar metal component (e.g., a housing) with a first CLTE, a second component (e.g., a bearing component) having a second CLTE, and a polymeric composite with a third CLTE. The first CLTE is greater than the second CLTE. The third CLTE is less than or equal to the second CLTE, so that the polymeric composite structure attached to the first planar metal component reduces thermal expansion of the first planar metal component in at least one linear direction and minimizes separation of the second surface of the first planar metal component from the second component.