Wiper Blade Spring Strip Torsional Resistance via Reinforcing Element
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Solution Overview
Problem
Wiper blades with two spring strips tend to twist easily due to low torsional resistance, leading to deterioration in functional performance.
Innovation Solution
The spring strips are rigidly connected by a reinforcing element that engages with the wiper blade body on the side opposite the wiper lip, increasing torsional resistance and preventing deformation, with the reinforcing elements being U-shaped and made of plastic to minimize material usage and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If two spring strips are used to reinforce the wiper rubber, then the contact pressure uniformity is improved, but the torsional resistance decreases causing the wiper blade to twist easily
Solution Approach 1:
The patent combines the two separate spring strips into a single integrated spring rail structure. This merging of the two strips into one unified component with a specific cross-sectional geometry (where the distance between outer surfaces is greater than the distance between inner surfaces) simultaneously provides the necessary contact pressure uniformity and torsional resistance, resolving the contradiction between these two requirements.
2Device complexity
If the spring strips are not rigidly connected, then the device complexity is reduced, but the wiper blade body twists and the spring strips rotate out of their mounts
Solution Approach 1:
The patent merges the two spring strips into a single integrated spring rail that inherently provides structural stability. This integration eliminates the need for additional connecting elements between separate strips, maintaining structural simplicity while significantly improving the stability of the wiper blade body and preventing rotation out of mounts.
3Strength
If reinforcing elements are added to increase torsional resistance, then the wiper blade stability is improved, but the material requirements and interference with the wiper blade body increase
Solution Approach 1:
The patent implements local quality by designing the spring rail with a non-uniform cross-section where the distance between outer surfaces is greater than the distance between inner surfaces. This localized geometric variation optimizes the distribution of material to maximize torsional resistance exactly where needed, while minimizing overall material usage and avoiding interference with the wiper blade body.
Data Source
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AI summary
The invention relates to a wiper blade (10) for the cleaning of vehicle windows, with a wiper blade body (12), which is able to be connected to a wiper arm (1) via preferably a wiper blade adapter (11) arranged approximately centrally on the wiper blade body (12), wherein the wiper blade body (12) has a wiper rubber (13) with a wiper lip (14), and wherein a receiving groove (16, 17) which is U-shaped in cross section is formed and in which a strip-shaped spring strip (18, 19) engages in the wiper rubber (13) on both longitudinal sides lying opposite each other. According to the invention, it is provided that the two spring strips (18, 19) are rigidly connected to each other by means of at least one reinforcing element (25), wherein the reinforcing element (25) engages over the wiper blade body (12) on the side facing away from the wiper lip (14) and is connected at least indirectly to the two spring strips (18, 19).