Wiper Blade Backing Curvature Optimization
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Solution Overview
Problem
Existing wiper blades face challenges in achieving uniform contact pressure across the entire wiping area of a curved glass surface, requiring skilled technicians and extensive time for adjustment, which limits their wiping performance.
Innovation Solution
A wiper blade partial pressure setting method that virtually divides the backing into regions, discretizes the wiping area, and adjusts the curvature and rigidity of each region to minimize contact pressure variations, allowing for easier computation and improved wiping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the load applied to each holding claw is adjusted only by the space between holding claws, then the contact pressure against the glass surface can be adjusted in the longitudinal direction of the blade rubber, but the wiping performance over the entire wiping area cannot be optimized and the adjustment process requires extensive time and skilled technicians
Solution Approach 1:
The backing is divided into multiple regions along the longitudinal direction, with each region having independently adjustable curvature and rigidity parameters. This segmentation allows precise control of contact pressure at different locations without requiring extensive manual adjustment of holding claw spacing, thereby reducing adjustment time while improving contact pressure uniformity.
Solution Approach 2:
Different regions of the backing are assigned different curvature and rigidity characteristics tailored to specific locations. This local differentiation enables optimized wiping performance across the entire glass surface by addressing varying contact pressure requirements at different positions, eliminating the need for time-consuming trial-and-error adjustments by skilled technicians.
2Reliability
If the curvature and rigidity of backing regions are optimized for best wiping performance, then the wiping performance over the entire wiping area is maximized, but the complexity of determining optimal parameters increases
Solution Approach 1:
Optimal curvature and rigidity parameters for each backing region are predetermined through computational analysis before manufacturing. This preliminary determination of parameters eliminates the need for complex on-site adjustments while ensuring best wiping performance, as the backing is designed with pre-calculated geometric characteristics that optimize contact pressure distribution across the glass surface.
Solution Approach 2:
The invention systematically varies curvature and rigidity parameters across different backing regions based on computational optimization. By changing these geometric parameters in a structured manner rather than through trial-and-error, the complexity of parameter setting is reduced while achieving reliable wiping performance across the entire wiping area.
3Ease of manufacture
If a straight shape backing is used, then the manufacturing is simple, but the contact pressure cannot be unified across the curved glass surface
Solution Approach 1:
The backing is designed with curved shapes instead of straight lines, with different regions having specific curvature radii. This curvature allows the backing to conform to the curved glass surface, unifying contact pressure across the wiping area. The curved geometry is incorporated into the manufacturing process, maintaining simplicity while achieving precise contact pressure distribution.
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 method ensures uniform contact pressures across the entire wiping area, enhancing wiping performance and simplifying adjustments, even for non-skilled technicians, while reducing the complexity of computations.
Implementation Method 1
Each backing is made from a metal plate material and is formed into a straight shape (a linear shape) or a curved shape that has a predetermined curvature in the longitudinal direction thereof, and the backing has a resiliency in a plate thickness direction thereof.
Data Source
AI summary
A backing of a wiper blade (53) is virtually divided into a plurality of regions in a longitudinal direction of the backing. A wiping area (B) of the wiper blade (53) in a glass surface (50a) is discretized in a wiping direction (x direction) of the wiper blade (53) and in a longitudinal direction (z direction) of the wiper blade (53). A curvature of each of the plurality of virtually divided regions of the backing is set in such a manner that a sum of variation differences of contact pressures (Fyij) at respective discretized points (Pij) is minimized. With such a wiper blade partial pressure setting method, a wiping performance of the wiper blade (53) can be easily and reliably improved over the entire wiping area of the wiping surface.