Wiper Blade Elastic Member Pressure Distribution
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Solution Overview
Problem
Conventional wiper blade assemblies face challenges in achieving superior wiping characteristics due to inadequate control over the distribution of pressing pressure and contact force, which affects the contact member's ability to effectively remove rain or dirt from vehicle windshields.
Innovation Solution
A wiper blade assembly design that includes an elastic member with specific pressure distribution patterns, where the pressing pressure is evenly distributed between defined points and increases towards the ends, allowing for controlled contact force distribution to improve contact with the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiper arm presses the wiper blade assembly with a certain force, then the wiper blade assembly is pressed against the windshield to perform wiping function, but the distribution of pressing pressure on the elastic member cannot be controlled, resulting in poor contact characteristics
Solution Approach 1:
The elastic member is designed with non-uniform cross-sectional areas along its length, creating different local stiffness characteristics. The cross-sectional area is larger in the central region and smaller at the end regions, which causes the pressing pressure to be distributed more evenly across the contact surface. This local variation in geometry allows different portions of the elastic member to exert different contact forces on the windshield, improving overall contact characteristics.
Solution Approach 2:
The patent modifies the physical parameters of the elastic member by varying its cross-sectional area along the length. This parameter change transforms the pressure distribution pattern from concentrated to evenly distributed, allowing the elastic member to adapt to the windshield's curvature and maintain reliable contact throughout the wiping surface.
2Ease of manufacture
If the elastic member has uniform structure, then manufacturing is simple, but the pressing pressure is not evenly distributed, affecting wiping performance
Solution Approach 1:
Instead of using a uniform structure throughout, the elastic member incorporates local variations in cross-sectional area. The central portion has a larger cross-section while the end portions have smaller cross-sections. This local differentiation optimizes pressure distribution and wiping performance without requiring completely complex manufacturing processes, maintaining a balance between ease of manufacture and productivity.
3Device complexity
If the wiper blade assembly uses conventional design, then the structure is simple, but it cannot follow the windshield's curvature, especially at sharply curved areas
Solution Approach 1:
The elastic member's cross-sectional area varies locally along its length, with the central region having a larger area and the end regions having smaller areas. This creates a gradient in stiffness that allows the blade to flex and conform to curved windshield surfaces, particularly at the sharply curved end areas, while maintaining structural integrity and simple overall design.
Solution Approach 2:
The non-uniform cross-sectional design allows the elastic member to dynamically adapt its flexibility along its length. The smaller cross-sectional areas at the ends provide greater flexibility to follow curved surfaces, while the larger central area maintains structural stability. This dynamic adaptation enables the blade to effectively follow various windshield geometries.
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 design enhances the wiper blade's ability to follow the windshield's curvature, improving wiping efficiency and contact characteristics, especially at sharply curved areas.
Implementation Method 1
an elastic member which supports the contact member, wherein the elastic member includes a body and a central portion which is located in a central area of the body
Data Source
AI summary
According to the inventive concept, the distribution of the pressing pressure applied to the elastic member is controlled, and the contact force with which the contact member is pressed against the windshield of a vehicle is controlled by controlling the distribution of the pressing pressure of the elastic member, and, this improves the ability of the contact member to follow the windshield of the vehicle, thereby improving wiping characteristics of the wiper blade assembly.