Wiper Lever Assembly with Downward Gradient Fin Surfaces
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Solution Overview
Problem
Existing wiper blades face challenges in achieving uniform pressure distribution and aerodynamic characteristics, with flat type wiper blades struggling to maintain low projection height while maintaining effective wiping performance, and tournament structure wiper blades experiencing increased lift and drag.
Innovation Solution
A wiper lever assembly with a main lever, movable covers, and yoke levers, where the main lever and movable covers have fin surfaces with downward gradients, and yoke levers are housed compactly with greater height at the rear side, allowing for uniform pressure distribution and reduced projection height, enhancing aerodynamic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tournament structure wiper lever assembly is used, then wiping performance is improved through uniform pressure distribution, but projection height increases resulting in greater lift and drag
Solution Approach 1:
The yoke levers are nested inside the housing compartments formed in the main lever and movable covers. This nesting arrangement allows the tournament structure components to be contained within a compact footprint, maintaining low projection height while preserving the uniform pressure distribution benefits of the tournament structure.
Solution Approach 2:
The housing compartments are designed with varying height dimensions - greater at the width direction rear side and lesser at the width direction front side. This local variation in geometry allows optimal positioning of yoke levers to achieve uniform pressure distribution while minimizing overall projection height for improved aerodynamics.
2Object-affected harmful factors
If a flat type wiper blade is used, then aerodynamic characteristics are improved through low projection height, but uniform pressure distribution becomes difficult to attain
Solution Approach 1:
The wiper lever assembly is segmented into a main lever, multiple yoke levers, and movable covers that work together in a tournament structure. This segmentation allows each component to be optimized for both compact positioning (low projection height) and functional performance (uniform pressure distribution through multiple contact points).
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
The solution achieves improved wiping performance with uniform pressure distribution and reduced drag, maintaining a low projection height while securing strength and aerodynamic benefits.
Implementation Method 1
Upper faces of the main lever and the respective movable covers are formed with fin faces to convert travel-induced wind into a pressing force toward a wiping surface
Data Source
AI summary
A wiper blade includes a wiper lever assembly with a tournament structure. The wiper lever assembly includes a main lever and a pair of movable covers. The two length direction sides of the main lever and the movable covers are respectively formed with fin surfaces each having a downward gradient on progression toward a vehicle front side, and main housing compartments and movable housing compartments that are open toward a wiping surface. A pair of yoke levers are respectively housed spanning inside the main housing compartments and inside the movable housing compartments, and are coupled so as to be capable of pivoting to the main lever and to the movable covers. The main housing compartments, the movable housing compartments, and the yoke levers each has a greater height dimension at a rear side than at a front side.