Wiper Blade Lip Structure With Cavity Damping for Stable Wiping
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Solution Overview
Problem
Existing wiper blades with triangular lip portions and parallel incisions do not achieve optimal wiping results without increasing costs, and they lack secure mounting and effective moisture removal from windshields.
Innovation Solution
A wiper blade design featuring a cavity portion between the fastening and lip portions, with a T-shaped fastening portion, symmetrically formed lip with incisions creating tilt bars, and spring bar arrangements between the cavity and upper bar, providing secure mounting and improved wiping efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a triangular lip portion with parallel incisions is used, then the wiper blade structure is simple, but the wiping result is not optimal
Solution Approach 1:
The lip portion is segmented into multiple tilt bars through parallel incisions, creating distinct segments that can independently adapt to the windshield surface. This segmentation improves wiping reliability by ensuring continuous contact across the lip width while maintaining a relatively simple overall structure.
Solution Approach 2:
The incisions create local variations in the lip portion structure, forming tilt bars with different flexibility characteristics. This local quality enhancement allows specific regions to better conform to the windshield curvature, improving the wiping result without significantly increasing overall structural complexity.
2Reliability
If the wiper lip slides over the windshield, then moisture removal is effective, but the mounting security is insufficient
Solution Approach 1:
The tilt bars are designed to be flexible and dynamic, allowing them to bend and adapt to the windshield surface during operation. This dynamic behavior ensures effective moisture removal while the overall mounting structure remains secure through the fastening portion's rigid connection.
3Ease of manufacture
If the cavity portion is significantly wider than the lip portion, then extrusion of the wiping strip is favorable, but the manufacturing complexity increases
Solution Approach 1:
The cavity portion dimensions are optimized with a width significantly larger than the lip portion, creating favorable parameters for the extrusion process. This parameter change allows the wiping strip to be properly formed and secured during manufacturing, improving ease of manufacture while the geometric complexity remains manageable.
Data Source
AI summary
A wiper blade (10), in particular for a motor vehicle, is proposed with a wiping strip (16) mounted between a first spring bar portion (34) and a second spring bar portion (36) by a fastening portion (24) and having a substantially triangular lip portion (18). According to the invention, between the fastening portion (24) and the lip portion (18), a cavity portion (22) is provided, on which dampening means (52) are provided, in particular fastened thereto or formed in one piece therewith.