Wiper Blade Connection Member Vibration Prevention
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Solution Overview
Problem
The existing connection members for wiper blades suffer from insufficient vibration prevention due to resin shrinkage causing inward deformation of the lower side walls, which affects the sliding contact with the blade main body, leading to vibration issues during wiping.
Innovation Solution
The connection member features projections on the outer surfaces of the side walls with larger outward projection amounts on the lower piece compared to the upper piece, allowing for reliable sliding contact with the blade main body even when the lower piece deforms inward, and includes various configurations such as stepped, inclined, and partitioned projections to enhance deformation compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lower piece is separated from the right and left side walls to be elastically deformable for removable attachment, then the ease of operation is improved, but the manufacturing precision deteriorates due to inward deformation at the lower halves
Solution Approach 1:
The patent applies local quality by making the lower piece separable from the right and left side walls specifically at the lower half portion, while maintaining integral formation at the upper half. This localized separation allows the lower piece to be elastically deformable for easy attachment/detachment operations, while the upper half remains precisely formed for stable shaft support. The different structural approaches at different locations resolve the contradiction between operational ease and manufacturing precision.
Solution Approach 2:
The lower piece is segmented from the right and left side walls through grooves, creating an independent elastic component. This segmentation allows the lower piece to function as a separate elastic element that can deform inward for attachment while the main body maintains its precision. The segmentation enables the lower piece to be press-fitted into the wiper arm tip end portion while accommodating deformation without affecting the overall structural precision.
2Reliability
If projections are formed with larger outward projection amounts on the lower piece, then the reliability of sliding contact is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by forming projections specifically on the outer surfaces of the right and left side walls at the lower piece portion, rather than uniformly across the entire connection member. These localized projections with larger outward projection amounts provide reliable sliding contact and vibration prevention exactly where the separable lower piece creates deformation risk, without adding unnecessary complexity to the integral upper half structure.
3Ease of operation
If the connection part is vertically open to be lip-shaped for removable attachment, then the ease of operation is improved, but the manufacturing precision deteriorates due to resin shrinkage causing inward deformation
Solution Approach 1:
The connection part is segmented into an integral upper half and a separable lower half. The vertical opening at the lower half allows the lower piece to be elastically deformed for easy attachment and removal operations. Meanwhile, the integral upper half maintains structural rigidity and precision, preventing resin shrinkage deformation from affecting the sliding contact surfaces. This segmentation resolves the contradiction between operational ease and manufacturing precision.
Solution Approach 2:
The patent applies local quality by providing different structural characteristics at different portions of the connection part. The upper half maintains a closed, integral structure for precision and stability, while the lower half is opened vertically to be lip-shaped, allowing elastic deformation for easy attachment. This localized differentiation resolves the contradiction between operational ease and manufacturing precision.
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 effectively prevents vibration by ensuring secure sliding contact and deformation compatibility, enhancing the wiper blade's ability to maintain attachment and reduce vibration during operation.
Implementation Method 1
projections that come into sliding contact with inner side surfaces at the opening are formed on outer side surfaces of the right and left side walls
Data Source
AI summary
A connection member that includes right and left side walls; a shaft support portion that is swingably fitted onto a support shaft that is provided at the blade main body; upper and lower pieces that are formed so as to be continuous from the shaft support portion; and projections that come into sliding contact with inner side surfaces at the opening are formed on outer side surfaces of the right and left side walls, wherein: the shaft support portion and the upper piece are integrally formed so as to bridge the right and left side walls, the lower piece is formed so as to be separated from the right and left side walls by a groove, and outward projection amounts of the projections are larger at the lower piece than at the upper piece.