Wiper End Cap Aerodynamic Profiles for Uniform Blade Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wiper systems for vehicles suffer from non-uniform wiping and cleaning effectiveness, particularly at the longitudinal ends where the scraper blade may detach from the glazed surface, leading to wiping defects.
Innovation Solution
The endpiece of the wiper features distinct first and second aerodynamic profiles, with a step between them, ensuring consistent pressing force along the entire length, including the ends, by enveloping the longitudinal frame and utilizing different surface profiles to maintain contact with the glazed surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single aerodynamic profile is used along the entire length of the wiper, then the structure is simple, but the pressing force is non-uniform causing poor wiping at the ends
Solution Approach 1:
The endpiece is divided into a first zone with a first aerodynamic profile and a second zone with a second aerodynamic profile. This segmentation allows different sections to generate different aerodynamic forces, ensuring uniform pressing along the entire wiper length while maintaining a relatively simple overall structure.
Solution Approach 2:
Different aerodynamic profiles are applied to different zones of the endpiece. The first zone has a first aerodynamic profile optimized for its location, while the second zone has a second aerodynamic profile optimized for its location. This local optimization ensures effective pressing force distribution without requiring complete structural redesign.
2Reliability
If the scraper blade is pressed hard against the glazed surface, then cleaning effectiveness improves, but the blade may detach at the longitudinal ends
Solution Approach 1:
The endpiece with its specific aerodynamic profiles is installed at the longitudinal end of the wiper frame before operation. This preliminary configuration ensures that aerodynamic pressing force is applied to the scraper blade at the very beginning of the wiping action, preventing detachment before it can occur and maintaining stable attachment throughout operation.
Solution Approach 2:
The endpiece acts as an intermediary component between the wiper frame and the scraper blade. It transmits and distributes aerodynamic forces uniformly along the blade, including at the longitudinal ends, thereby maintaining both cleaning effectiveness and attachment stability without direct mechanical intervention.
3Ease of manufacture
If the wiper is designed with uniform aerodynamic profile, then manufacturing is easier, but pressing force distribution is non-uniform
Solution Approach 1:
The endpiece is segmented into zones with different aerodynamic profiles that can be manufactured as integrated features of a single component. This segmentation achieves non-uniform pressing force distribution while avoiding the need for multiple separate parts, thus maintaining ease of manufacture.
Solution Approach 2:
Multiple functional zones with different aerodynamic profiles are merged into a single integrated endpiece component. This combining approach achieves the complex pressing force distribution pattern while maintaining a simple single-part structure that is easy to manufacture as one piece.
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
Ensures effective wiping and cleaning over the entire length of the wiper, preventing detachment of the scraper blade and enhancing aerodynamic thrust for improved contact with the glazed surface.
Implementation Method 1
the first and second aerodynamic profiles of the endpiece which ensure that the wiper is pressed against the glazed surface over the entire length thereof
Data Source
AI summary
The invention relates to an endpiece of a wiper for a vehicle, this endpiece being arranged to be mounted at an end of a longitudinal frame which bears a scraper blade for cleaning a glazed surface, the endpiece having a first zone which is arranged to receive an end portion of the longitudinal frame and includes a first aerodynamic profile and a second zone which includes a second aerodynamic profile, this second zone being arranged such that the end portion of the longitudinal frame received in the first zone is set back from this second zone, and that the first aerodynamic profile of the first zone is different from the second aerodynamic profile of the second zone.