Coupling Clip Damper Member for Wiper Juddering Suppression
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Solution Overview
Problem
Existing coupling clips for wiper arms and levers fail to effectively suppress juddering of wiper blades, particularly at low movement speeds or when blade rubber degrades, due to increased friction between the blade rubber and windshield glass.
Innovation Solution
A coupling clip with a damper member that attenuates energy from juddering by deforming between the wiper lever and the clip body, reducing displacement and friction, and is attached to the wiper lever and arm to stabilize the wiper blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coupling clip is used to couple the wiper arm and wiper lever, then the structure is simple and easy to manufacture, but the wiper blade judders when moving at low speed or when the blade rubber degrades due to increased friction
Solution Approach 1:
The coupling clip changes its physical state from rigid to flexible by controlling the elasticity of the resin material. The clip body is designed with specific elastic properties that allow it to deform and absorb juddering energy while maintaining structural integrity for anchoring the wiper arm and lever.
Solution Approach 2:
The coupling clip is made from resin material that combines rigidity for anchoring functions with elasticity for juddering suppression. This composite material approach allows the single component to perform both structural support and vibration damping functions simultaneously.
2Strength
If the coupling clip is made more rigid to maintain structural stability, then anchoring reliability is improved, but juddering suppression capability deteriorates
Solution Approach 1:
The resin material's elastic modulus and hardness are optimized to achieve a balance between rigidity for anchoring and flexibility for damping. The material properties are selected so that the clip maintains sufficient strength for secure anchoring while possessing enough elasticity to suppress juddering motions.
Solution Approach 2:
The coupling clip transitions from a static rigid structure to a dynamic flexible component that can adapt its stiffness characteristics. The elastic deformation capability allows the clip to dynamically respond to juddering forces while maintaining anchoring function.
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 damper member effectively reduces juddering of the wiper blade by up to 75% compared to configurations without it, improving the stability and performance of the wiper system.
Implementation Method 1
The damper member is interposed between the wiper lever and the clip body in a width direction of the wiper lever, and by deforming attenuates energy accompanying juddering of the wiper lever in the width direction
Implementation Method 2
Energy accompanying the width direction juddering of the wiper blade configured including the coupling clip coupled to the wiper arm is thereby attenuated by this deformation of the damper member
Data Source
AI summary
A coupling clip includes a clip body that includes a wiper lever anchor portion to be anchored to a coupling shaft provided at a wiper lever assembly supporting a blade rubber, and a wiper arm anchor portion for anchoring a wiper arm. The coupling clip also includes a damper member that is attached to the clip body. When the wiper lever assembly is displaced with respect to the clip body, the damper member is deformed between the wiper lever assembly and the clip body.