Wiper Wind Deflector Protrusions for Stable Jet Delivery
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Solution Overview
Problem
Existing windscreen wiper systems face challenges in securely retaining the wiper arm and blade at all driving speeds and ensuring effective delivery of cleaning liquid to the windscreen.
Innovation Solution
A wind deflector with integrated wind guiding elements, such as protrusions, that guide airflow to securely hold the wiper arm and blade while directing cleaning liquid from nozzles to the windscreen with minimal deflection, using a combination of hard and elastic plastic components to optimize aerodynamics and liquid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous wind guiding element is used, then aerodynamic retention of the wiper arm and blade is improved, but excessive swirling and deflection of the cleaning liquid jet occurs
Solution Approach 1:
The wind guiding element is segmented into multiple discrete protrusions arranged in a row, rather than using a continuous structure. Each protrusion is spaced at a specific distance from the others, creating gaps that allow the cleaning liquid jet to pass through without excessive swirling while still providing aerodynamic retention of the wiper components.
Solution Approach 2:
The wind guiding element has different local properties: the protrusions provide aerodynamic retention in the regions where they are located, while the gaps between protrusions allow unobstructed passage of the cleaning liquid jet. This local differentiation resolves the contradiction between retention and liquid flow.
2Productivity
If the nozzle is positioned directly facing the windscreen, then cleaning liquid delivery is improved, but the wiper arm and blade are not reliably retained at all driving speeds
Solution Approach 1:
The protrusions act as intermediary elements between the nozzle and the windscreen. They modify the airflow in a way that provides retention force on the wiper components while allowing the cleaning liquid jet to pass through the gaps and reach the windscreen effectively.
3Reliability
If a large wind guiding element is used, then aerodynamic influence is improved, but the cleaning liquid jet path is excessively obstructed and deflected
Solution Approach 1:
By segmenting the wind guiding element into multiple smaller protrusions with gaps between them, the aerodynamic retention function is maintained through the cumulative effect of the protrusions, while the gaps minimize obstruction and deflection of the cleaning liquid jet path.
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 ensures reliable retention of the wiper arm and blade over all speeds and effective, undisturbed delivery of cleaning liquid to the windscreen, preventing excessive swirling and ensuring a direct jet impact.
Implementation Method 1
a wind deflecting contour, by means of which an air flow can be guided in the area of an associated wiper arm and a wiper blade
Implementation Method 2
a kind of slipstream is provided by the respective wind guiding element on the other hand, in which the nozzle can be arranged, and the free path to the windscreen is reduced such that cleaning liquid exiting the nozzle does not excessively swirl
Data Source
AI summary
A wind deflector for a windscreen wiper system of a motor vehicle has a windscreen-cleaning apparatus with at least one nozzle for cleaning a windscreen integrated therein. The wind deflector has a wind deflector contour, by way of which an air flow in the region of an associated wiper arm and a wiper blade can be guided. The wind deflector, on its side that faces the wiper blade, has at least one wind-guiding element, which is arranged in the region of the associated nozzle and protrudes, raised, toward the windscreen.