Variable Pitch Nozzle Windshield Wiper Blade for Homogeneous Cleaning
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Solution Overview
Problem
Current windshield wiper systems with uniform nozzle distribution fail to provide effective cleaning, especially in areas swept by both blades, leading to persistent dirt and uneven water distribution due to varying brush movement speeds and overlapping zones.
Innovation Solution
A wiper blade system with nozzles positioned such that the pitch between consecutive nozzles is reduced at the top and increased at the bottom, optimizing nozzle density to ensure homogeneous washing across the windshield, particularly by adjusting the nozzle pitch between two thirds and one third of the upper part's pitch in the lower part for the driver's blade and vice versa for the passenger's blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform nozzle distribution is used along the wiper blade, then manufacturing is simple, but cleaning effectiveness deteriorates due to uneven water distribution in overlapping zones
Solution Approach 1:
The patent applies local quality by varying the nozzle pitch along the length of the wiper blade. The pitch between consecutive nozzles is not uniform but changes progressively: smaller in the lower part and larger in the upper part. This local variation optimizes water distribution in different zones of the windshield, particularly addressing the overlapping area where two blades meet, thereby improving cleaning effectiveness without compromising manufacturing feasibility.
Solution Approach 2:
The patent implements parameter changes by modifying the pitch parameter of the nozzles along the blade length. Specifically, the pitch increases from the lower part to the upper part of the blade. This parameter variation ensures that the water flow density is adapted to the local cleaning needs, with higher density in areas requiring more water (lower part) and lower density in areas swept by both blades (upper part), thus resolving the contradiction between manufacturing simplicity and cleaning effectiveness.
2Device complexity
If constant pitch between nozzles is maintained, then device complexity is low, but water distribution homogeneity deteriorates in overlapping zones
Solution Approach 1:
The patent applies local quality by varying the nozzle pitch along the length of the wiper blade. The pitch between consecutive nozzles is not uniform but changes progressively: smaller in the lower part and larger in the upper part. This local variation optimizes water distribution in different zones of the windshield, particularly addressing the overlapping area where two blades meet, thereby improving cleaning effectiveness without compromising manufacturing feasibility.
Solution Approach 2:
The patent implements parameter changes by modifying the pitch parameter of the nozzles along the blade length. Specifically, the pitch increases from the lower part to the upper part of the blade. This parameter variation ensures that the water flow density is adapted to the local cleaning needs, with higher density in areas requiring more water (lower part) and lower density in areas swept by both blades (upper part), thus resolving the contradiction between manufacturing simplicity and cleaning effectiveness.
3Reliability
If nozzle pitch is reduced at the top of the blade, then water distribution in overlapping zones improves, but nozzle density increases leading to higher manufacturing complexity
Solution Approach 1:
The patent applies local quality by varying the nozzle pitch along the length of the wiper blade. The pitch between consecutive nozzles is not uniform but changes progressively: smaller in the lower part and larger in the upper part. This local variation optimizes water distribution in different zones of the windshield, particularly addressing the overlapping area where two blades meet, thereby improving cleaning effectiveness without compromising manufacturing feasibility.
Solution Approach 2:
The patent implements parameter changes by modifying the pitch parameter of the nozzles along the blade length. Specifically, the pitch increases from the lower part to the upper part of the blade. This parameter variation ensures that the water flow density is adapted to the local cleaning needs, with higher density in areas requiring more water (lower part) and lower density in areas swept by both blades (upper part), thus resolving the contradiction between manufacturing simplicity and cleaning effectiveness.
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 configuration ensures thorough cleaning of all windshield zones by adjusting nozzle density to match the areas' specific needs, reducing dirt persistence and improving water distribution, especially in central and edge areas swept by both blades.
Implementation Method 1
at least one means for spraying said window with a washing liquid, said means comprising a plurality of nozzles positioned along at least one side of said brush
Data Source
Figure 1~2
Figure 3
AI summary
A windshield wiper blade (2c) for a vehicle window, comprising at least one means for projecting washing fluid onto said window, said means comprising a plurality of nozzles (3) positioned along at least one side of said blade, characterized in that, on the same side, the spacing between at least two consecutive nozzles (3) in a portion of the blade (2c) is shorter than the spacing between at least two consecutive nozzles (3) located in a higher portion of the blade. Preferably, it comprises a lower portion and an upper portion, the spacing between the nozzles (3) of the lower portion being shorter than the spacing between the nozzles (3) of the upper portion.