Wiper Blade Adapter Aerodynamics for High-Speed Contact Force
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Solution Overview
Problem
Existing wiping devices require a high contact force to ensure sufficient wiping performance, which can lead to increased complexity and cost in the wiper arm mechanism, and may result in unfavorable aerodynamics that hinder wiping performance at high speeds.
Innovation Solution
An adapter unit with a wind deflector that includes a first part and a second part area, each with a different orientation and geometry, designed to absorb and direct wind flow, thereby reducing the required contact force and improving aerodynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high contact force is applied by the wiper arm to press the wiper blade against the windshield, then wiping performance is improved, but the device complexity and cost increase due to stronger springs and mechanisms being required
Solution Approach 1:
The patent converts the harmful aerodynamic lift force that acts on the wiper blade at high speeds into a beneficial effect. By designing the adapter unit with a specific aerodynamic profile, the airflow generated during vehicle motion creates a downforce that presses the wiper blade against the windshield, complementing the mechanical contact force and reducing the burden on the wiper arm mechanism
Solution Approach 2:
The patent utilizes aerodynamic forces (a form of pneumatic effect) by designing the adapter unit with surfaces that interact with oncoming airflow. The aerodynamic profile generates pressure differences that create a force component pressing the wiper blade against the windshield, supplementing the mechanical spring force
2Reliability
If a high contact force is applied by the wiper arm, then wiping performance is improved, but the required spring force increases leading to higher energy consumption and greater mechanical stress
Solution Approach 1:
The patent converts the harmful aerodynamic lift into a beneficial downforce that supplements the spring force. This reduces the total force requirement from the spring, lowering energy consumption and mechanical stress while maintaining adequate contact force for effective wiping
Solution Approach 2:
The aerodynamic downforce generated by the adapter unit acts as a counterbalance to the aerodynamic lift that would otherwise reduce contact force. This natural counterweight effect reduces the burden on the mechanical spring system
3Reliability
If the wiper arm exerts high contact force to maintain blade contact with the windshield, then wiping performance is improved, but unfavorable aerodynamics at high speeds can generate opposing forces that reduce contact force and impair wiping
Solution Approach 1:
The patent directly addresses this contradiction by converting the harmful aerodynamic lift into a beneficial effect. The adapter unit's aerodynamic profile is designed to generate downforce from the same airflow that would otherwise create lift, turning the harmful factor into an ally that enhances contact force at high speeds
Solution Approach 2:
The patent introduces a dynamic component to the contact force system. The aerodynamic forces acting on the adapter unit vary with vehicle speed, providing speed-dependent supplementation to the mechanical spring force. At higher speeds, the aerodynamic downforce increases, automatically compensating for the tendency of mechanical systems to lose contact pressure
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 adapter unit effectively reduces the contact force needed to press the wiping blade onto the vehicle window, enhances wiping performance, and improves aerodynamics by utilizing wind deflection to maintain contact and prevent turbulence.
Implementation Method 1
the wind deflector surface has at least a first partial surface and a second partial surface... configured to deflect oncoming airflow and press the wiper blade against a vehicle window
Data Source
Figure 1
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AI summary
The invention relates to an adapter unit which is provided for coupling, in particular releasably coupling, a wiper blade to a wiper arm, having a wind deflecting surface which is designed to deflect inflowing air and press the wiper blade against a vehicle windshield. According to the invention, the wind deflecting surface has at least one first sub-surface and a second sub-surface, wherein the first sub-surface has a different orientation than the second sub-surface and/or the first sub-surface has a different geometry than the second sub-surface.