Headlamp Wiper Layout for Weather-Protected Lens Cleaning
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Solution Overview
Problem
Existing motor vehicle headlights suffer from wiper blades that are exposed to weather conditions, reducing their service life and the effectiveness of lens cleaning.
Innovation Solution
The wiper blade is positioned below the screen's upper edge in the starting position and extends over it in the end position, protected from the weather, and the lens is composed of materials with varying hardness to minimize mechanical damage during cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wiper blade is exposed to clean the lens, then the lens cleaning effectiveness is improved, but the wiper blade service life is reduced due to weather exposure
Solution Approach 1:
The lens is divided into two material areas with different hardness properties. The first area has lower hardness for better wiper blade contact and cleaning effectiveness, while the second area has higher hardness for durability and weather resistance. This segmentation allows the lens to simultaneously achieve effective cleaning and protect the wiper blade from excessive wear.
Solution Approach 2:
Different regions of the lens are assigned different material properties. The first area (with lower hardness) is optimized for wiper blade interaction and cleaning performance, while the second area (with higher hardness) is optimized for structural integrity and weather resistance. This local differentiation resolves the contradiction by providing the right material properties in the right locations.
2Strength
If the lens is made from a single hard material, then the mechanical strength is improved, but the cleaning quality is reduced due to increased mechanical damage
Solution Approach 1:
The lens incorporates two material areas with different hardness levels. The first area has lower hardness to minimize mechanical damage during cleaning and maintain high cleaning quality, while the second area has higher hardness to provide the necessary mechanical strength and durability. This local quality differentiation allows the lens to achieve both strong performance and gentle cleaning.
Solution Approach 2:
The lens is constructed as a composite structure with two different materials having different hardness properties. This composite approach enables the lens to combine the benefits of hard materials (strength, durability) with soft materials (gentle cleaning, reduced mechanical damage), thereby resolving the contradiction between mechanical strength and cleaning quality.
Data Source
AI summary
Motor vehicle headlight (1), comprising a lens ( ) a screen (3), a windscreen wiper (4) with a wiper blade (4a), which is arranged between the screen (3) and the lens (4a), a drive device (5), which is designed to move the wiper blade (4a) back and forth between a starting position and an end position, wherein an area (2b) of the lens (2) to be cleaned can be cleaned by moving the wiper blade (4a) from the starting position to the end position or from the end position to the starting position and by the contact of the wiper blade (4a) with the outside of the lens (2), wherein the wiper blade (4a) is located completely below an upper edge (3a) of the screen (3) in the starting position, and extends partially or completely over the upper edge (3a) of the screen (3) in the end position.