H-Shaped Connecting Device for Windscreen Wiper Rigidity
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Solution Overview
Problem
Prior art windscreen wiper devices suffer from insufficient rigidity in the connecting device, leading to deformation under high stresses, which results in the 'fish tailing phenomenon, causing deteriorated wiping performance, especially at high speeds.
Innovation Solution
The connecting device is designed with a substantially H-shaped cross-section, featuring lower legs connected to the wiper blade and upper legs receiving a joint part, with cylindrical protrusions and co-axial through holes, allowing for increased rigidity and a sidelock system with the oscillating arm, preventing deformation and improving interconnection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the connecting device is made with conventional design, then the device complexity is low, but the rigidity and strength are insufficient leading to deformation under high stresses
Solution Approach 1:
The connecting device is divided into distinct functional segments: lower legs for wiper blade connection, upper legs for joint part reception, and a base interconnecting them. This segmentation allows each part to be optimized for its specific function while maintaining overall structural integrity and rigidity.
Solution Approach 2:
The connecting device transitions from a planar or simple three-dimensional form to an H-shaped cross-section that utilizes spatial distribution of material more effectively. The H-shape distributes material along both horizontal and vertical dimensions, creating multiple load paths and significantly increasing moment of inertia and rigidity without proportionally increasing mass.
2Reliability
If the connecting device uses simple connection methods, then the ease of manufacture is high, but the reliability of connection under high stresses deteriorates
Solution Approach 1:
The lower legs, upper legs, and base are merged into a single integrated connecting device component. This merging ensures uniform material properties throughout, eliminates potential weak points at junctions between separate parts, and provides consistent structural behavior under stress while maintaining manufacturability through single-piece construction.
Solution Approach 2:
The connecting device combines different geometric forms (legs and base) into a composite H-shaped structure that functions as a unified load-bearing element. This composite geometry distributes stresses more effectively than simple monolithic designs while remaining manufacturable from single materials.
Data Source
Figure 1~6
AI summary
A windscreen wiper device (1) comprising an elastic, elongated carrier element, as well as an elongated wiper blade (2) of a flexible material, which can be placed in abutment with a windscreen to be wiped, which wiper blade includes at least one longitudinal groove (3), in which groove a longitudinal strip (4) of the carrier element is disposed, which windscreen wiper device comprises a connecting device (5) for an oscillating arm, wherein said oscillating arm can be pivotally connected to said connecting device about a pivot axis near one end, with the interposition of a joint part (6), with the special feature that said connecting device has a substantially H-shaped cross-section, wherein lower legs (9,10) of said H-shaped cross-section are connected to the flexible material of said wiper blade on opposite sides thereof, and wherein upper legs (13,14) of said H-shaped cross-section are adapted to receive said joint part.