Wiper Blade Adapter Venting for Water Pullback Reduction
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Solution Overview
Problem
Existing wiper blades experience a 'water pullback' error due to negative pressure at the rear side when moving counter to the incident flow direction, causing water to be returned to the field of view.
Innovation Solution
The wiper blade design includes a wiper blade adapter with a second adapter element receiving the S-shaped end portion of the wiper arm and through openings in the adapter elements to allow wind flow, reducing negative pressure and preventing water pullback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the wiper blade adapter has a compact structure with reduced overall height, then the negative pressure at the rear side is reduced, but the through openings must be carefully positioned to maintain structural integrity
Solution Approach 1:
The adapter is divided into two separate adapter elements (first adapter element and second adapter element) with through openings positioned at specific heights. This segmentation allows the wind flow to pass through multiple levels, effectively reducing negative pressure while maintaining a compact overall structure.
Solution Approach 2:
The through openings are arranged at different heights (vertical dimension) rather than just lateral positions. The first through opening is positioned at a first height and the second through opening at a second height, creating a multi-level flow path that reduces negative pressure without increasing the horizontal footprint of the adapter.
2Object-affected harmful factors
If through openings are added to the adapter elements to allow wind flow, then negative pressure is reduced and water pullback is prevented, but the adapter structure becomes more complex
Solution Approach 1:
The harmful negative pressure is extracted or vented through the through openings in the adapter elements. By providing dedicated flow paths at different heights, the harmful pressure buildup is actively removed, preventing water pullback without requiring complex active control systems.
Solution Approach 2:
The through openings act as intermediary channels that mediate between the incident wind flow and the interior space of the adapter. These openings allow the wind to pass through and equalize pressure, serving as a simple passive intermediary structure that eliminates the water pullback problem.
3Length of stationary object
If the overall height of the wiper blade adapter is reduced for a compact design, then space is saved, but the negative pressure reduction effect is diminished unless through openings are strategically positioned
Solution Approach 1:
Instead of uniformly reducing the adapter height, the design applies local quality by positioning through openings at specific critical heights. The first through opening at a first height and the second through opening at a second height create localized flow channels that maximize pressure equalization efficiency within the compact overall height constraint.
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
This design effectively reduces and potentially eliminates the water pullback error by minimizing negative pressure at the wiper blade adapter, ensuring a more effective cleaning action.
Implementation Method 1
the wiper blade adapter has at least one through opening for flow to pass through the wiper blade adapter in a direction running transversely to the longitudinal direction of the wiper blade
Implementation Method 2
the relative wind flows through the wiper blade adapter, with the result that a further significant reduction in the negative pressure in the region of the wiper blade adapter can be achieved
Data Source
AI summary
The invention relates to a wiper blade for cleaning a vehicle windscreen, wherein the wiper blade has a wiper blade body of flat construction and a wiper blade adapter connected to the wiper blade body, wherein the wiper blade adapter has a first adapter element, which is connected to the wiper blade body, and a second adapter element, which is connected pivotably to the first adapter element and is designed to receive an end portion of a wiper arm.