Thermoplastic Headlamp Assembly with Molded Interface

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Solution Overview

Problem

Current automotive headlamp assemblies face challenges in achieving a lightweight, low-energy consumption design with recyclability, as they often require incompatible polymer components that cannot be mechanically recycled together, and the use of metal parts increases weight and carbon footprint.

Innovation Solution

A headlamp assembly comprising a thermally conductive housing and bezel made from thermoplastic materials with a high impact strength, where the components are molded together without adhesives or fasteners, using injection molding processes to integrate functional elements like lights and sensors, and utilizing thermoplastic compositions with high thermal conductivity and polycarbonate content for compatibility and recyclability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If metal parts are used in headlamp assemblies, then strength and thermal conductivity are improved, but weight and carbon footprint increase

Engineering Contradiction:

Improvestructural strengthVSAvoidheadlamp weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The patent changes the material parameter from metal to thermoplastic polymer, specifically using polymers with enhanced thermal conductivity and mechanical properties. This substitution maintains structural strength while significantly reducing weight and carbon footprint of the headlamp assembly.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite thermoplastic materials that combine polymer matrices with reinforcing fillers or additives to achieve metal-like strength and thermal conductivity. These composite materials enable the housing to meet structural requirements without using traditional metal components.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If incompatible polymer components are used, then functional requirements are met, but recyclability is lost

Engineering Contradiction:

Improvefunctional compatibilityVSAvoidrecyclability

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent uses homogeneous or compatible polymer materials across different components (housing, bezel, lens) that can be molded together. This material compatibility ensures that all components can be mechanically recycled together as a single stream, eliminating the need for separation and enabling full recyclability of the headlamp assembly.

Inventive Principle:

Principle #33Homogeneity

Solution Approach 2:

The patent merges multiple components (housing, bezel, lens) into a single molded assembly using compatible thermoplastic materials. This integration allows all parts to be manufactured as one piece or easily separated for recycling, improving both manufacturing efficiency and recyclability while maintaining functional requirements.

Inventive Principle:

Principle #5Merging (Combining)

3Strength

If components are assembled with adhesives or fasteners, then mechanical stability is achieved, but device complexity and manufacturing steps increase

Engineering Contradiction:

Improvemechanical stabilityVSAvoidassembly complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent combines the housing, bezel, and lens into a single molded assembly, eliminating the need for separate assembly steps involving adhesives or fasteners. This integration maintains mechanical stability through the molded joints while significantly reducing device complexity and manufacturing steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces mechanical assembly methods (adhesives, fasteners) with a molding process that creates integrated joints. This substitution eliminates the need for secondary assembly operations while maintaining the mechanical stability required for headlamp functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 provides a mechanically stable, lightweight headlamp assembly with integrated functional elements, enabling efficient manufacturing and easy recycling, while reducing carbon footprint and energy consumption.

Implementation Method 1

A headlamp assembly comprising a thermally conductive housing and bezel made from thermoplastic materials

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the lens is thermally welded to the bezel or the housing, preferably laser welded

Methodology Applied

Scientific EffectLaser welding: Laser Beam Welding

Data Source

PatentUS12163640B2Three part headlamp assembly

Publication Date: 2024.12.10 COVESTRO LLC

AI summary

An assembly comprises a housing, a bezel and a lens, or a housing heat sink, a housing rim, a bezel and a lens, wherein the housing or the housing heat sink comprises a first surface and the bezel or the housing rim comprises a second surface, a portion of a first surface of the housing or housing heat sink is molded to a portion of the second surface forming an interface surface, the interface surface having an interface angle that does not deviate more than 90 degrees, measured from a central axis perpendicular to the bezel and the housing around which the bezel and the housing are molded, for all interface angles about the central axis.