Motor Vehicle Headlamp Adjustment for Thermal Distortion Compensation
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Solution Overview
Problem
Motor vehicle headlamps experience irreversible dimensional distortion due to thermal and thermomechanical loads, causing shifts in light distribution, which require manual readjustment by specialists.
Innovation Solution
Incorporating a heat-induced contraction element in the setting device that compensates for dimensional changes by rotating the light module, using a thermoplastic polymer that contracts irreversibly when heated, aligned with the adjusting screw axis, to maintain the factory default light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic supporting components are used for light modules, then ease of manufacture is improved through injection molding, but manufacturing precision deteriorates due to irreversible dimensional distortion under thermal and thermomechanical loads
Solution Approach 1:
The patent introduces a setting element made of thermoplastic material that undergoes controlled dimensional changes in response to temperature variations. This element is integrated into the setting device to actively compensate for the dimensional distortion of light modules under thermal and thermomechanical loads, thereby maintaining manufacturing precision while preserving the ease of manufacture of thermoplastic components
Solution Approach 2:
The setting device combines a setting element made of thermoplastic polymer with metallic components (adjusting screw, holder section, mounting section). This composite structure allows the thermoplastic setting element to provide thermal compensation while the metallic components provide mechanical strength and stability, resolving the contradiction between ease of manufacture and manufacturing precision
2Reliability
If light modules are fixed in target position using setting device, then reliability of light distribution is improved, but device complexity increases due to multiple adjusting screws and setting elements
Solution Approach 1:
The setting element is designed to automatically compensate for dimensional changes in light modules through its inherent thermoplastic properties. When temperature changes occur during operation, the setting element expands or contracts to maintain the light module in its target position, providing self-service compensation without requiring additional active control mechanisms or increasing device complexity
3Manufacturing precision
If manual readjustment is performed in specialist garage, then manufacturing precision is restored, but loss of time increases due to service intervention requirement
Solution Approach 1:
The setting element continuously compensates for dimensional distortion of light modules during operation through automatic thermal expansion and contraction. This self-service mechanism maintains manufacturing precision throughout the headlamp's operational life without requiring periodic manual readjustment in specialist garages, thereby eliminating time loss associated with service interventions
Solution Approach 2:
The setting device is pre-configured during manufacturing with the setting element positioned to provide optimal compensation. This preliminary setup ensures that the compensation mechanism is already in place and functional before the headlamp enters service, preventing the need for future service interventions and time loss
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
Prevents or reduces shifts in light distribution by automatically adjusting the light module's position, ensuring consistent light emission patterns without manual intervention.
Implementation Method 1
the setting device features a setting element held by the adjusting screw that is arranged on a side of the holder section facing away from the pretensioning element and is designed for a heat-induced contraction or shrinkage
Data Source
AI summary
A headlamp for a motor vehicle is provided with a light module, a carrier frame, and a setting device. The light module is accommodated at the carrier frame so that it can be rotated around a rotary axis (D). The setting device features an adjusting screw that connects a holder section of the light module radially at a distance from the rotary axis (D) to a mounting section of the carrier frame in such a way that the light module is arranged in a target position. The setting device features a pretensioning element held by the adjusting screw that pretensions the light module in the target position. The setting device features a setting element held by the adjusting screw that is arranged on the side of the holder section facing away from the pretensioning element and is designed to undergo heat-induced contraction or shrinkage.