Headlamp Thermal-Expansion Compensator With Adjustable Expansion Length
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Solution Overview
Problem
Existing thermal-expansion compensators for headlamp light modules are specific to each vehicle model, requiring custom design and material selection, leading to increased product diversity, complexity, and development costs, as they must account for unique geometric relationships and thermal expansion calculations.
Innovation Solution
A universal thermal-expansion compensator with a compensation insert and holder system that includes stop elements and receptacles, allowing for adjustable expansion length and direction, enabling flexible use across various headlamps by preventing relative movement and transferring forces along the compensation axis, thus compensating for thermal expansion without the need for precise sensors or complex control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a universal thermal-expansion compensator design is used, then product diversity and development costs are reduced, but adapting to specific geometric relationships and thermal expansion characteristics of different headlamps becomes more difficult
Solution Approach 1:
The thermal-expansion compensator is divided into separate modular components: a compensator body, a compensator element, and a mounting structure. This segmentation allows the same basic design to be adapted to different headlamp applications by configuring or selecting different components rather than redesigning the entire compensator for each application.
Solution Approach 2:
The mounting structure is designed with universal features that can accommodate different geometric relationships and thermal expansion characteristics across various headlamp models. The structure includes adjustable mounting positions and configurable attachment mechanisms that can be adapted to different headlamp geometries without requiring a completely new compensator design for each application.
2Measurement precision
If precise sensors and fine driving actuators are used for temperature regulation, then cut-off line positioning precision is improved, but device complexity and cost increase
Solution Approach 1:
The thermal-expansion compensator utilizes the natural thermal expansion and contraction properties of its components to automatically compensate for temperature-induced positioning changes. The compensator element expands and contracts in response to temperature changes, passively maintaining the correct geometric relationship between headlamp components without requiring active sensing or actuation systems.
Solution Approach 2:
The compensator is designed to exploit thermal expansion effects rather than fight them. By carefully selecting materials and geometries for the compensator body and compensator element, the system allows controlled thermal expansion that directly counteracts the thermal expansion of other headlamp components, thereby maintaining precise cut-off line positioning through passive thermal compensation.
3Manufacturing precision
If FEM simulations and complex thermomechanical modeling are performed, then thermal effects on light module tilting are better understood, but development time and computational resources increase
Solution Approach 1:
The compensator design incorporates pre-calculated compensation geometries and material selections that account for typical thermal expansion characteristics of headlamp assemblies. Rather than performing complex FEM simulations for each design iteration, the compensator elements are designed with predetermined dimensions and material properties that provide effective thermal compensation based on established thermal behavior patterns.
Solution Approach 2:
The compensator uses simple, inexpensive materials and geometries that can be quickly manufactured and tested without requiring extensive simulation and analysis. The design favors straightforward structural elements over complex optimized shapes, reducing the need for iterative FEM modeling while still achieving effective thermal compensation.
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 compact, stable, and cost-effective thermal-expansion compensator that can be adapted to different headlamps, reducing production complexity and costs while maintaining precise light distribution by canceling out thermal expansions, thereby maintaining the desired cut-off line positioning without the need for complex temperature regulation systems.
Implementation Method 1
The temperatures and thermal-expansion coefficients of the materials are being used to produce different thermal expansions, that is, different geometrical dimensions for the headlamp
Implementation Method 2
The compensation insert can be held selectively in one of the at least two stop receptacles of the compensation holder for forming the effective expansion length
Data Source
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AI summary
The invention relates to a thermal-expansion compensator (1) for holding a light module (103) in a housing (101) of a headlamp (100) of a vehicle (200), comprising: a compensation insert (10) extending along a compensation axis (A), the compensation insert (10) comprising a stop element (13) and the compensation insert (10) comprising a first cavity (11) therein, a compensation holder (20) extending along the compensation axis (A), the compensation holder (20) having at least two stop receptacles (23), whereby each of the at least two stop receptacles (23) is configured for holding the stop element (13) of the compensation insert (10), whereby the stop element (13) of the compensation insert (10) can be held selectively in one of the at least two stop receptacles (23) of the compensation holder (20) to form an effective expansion length, and a connection element (30), the connection element (30) being connectable to the compensation insert (10) inside of the first cavity (11) and being connectable to the housing (101) and/or light module (103) of the headlamp (100), such that the compensation insert (10) can expand or contract freely in the compensation holder (20) along the compensation axis (A) with its effective expansion length.