Wiper Blade Flat Weld Seam Force Transmission
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Solution Overview
Problem
Existing windshield wiper blades experience poor force transmission and uneven contact force distribution due to punctiform welding, which affects the wiping performance.
Innovation Solution
A wiper blade design featuring a flat weld seam between the base connection device and the support rail, with a base connection device having lateral holding members and access openings for precise welding, allowing for improved force distribution and secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If point-like welding is used at four predetermined welding points, then the welding process is simple and quick, but the force transmission is poor and contact force distribution is uneven
Solution Approach 1:
The invention transforms the welding connection from point-like (0D) at four discrete points to linear (1D) through a band-like weld seam that extends along the longitudinal extent of the base connection device. This dimensional change allows forces to be distributed continuously along the weld seam rather than concentrated at discrete points, significantly improving force transmission and contact force distribution while maintaining welding efficiency.
2Device complexity
If point-like welding is used at four predetermined welding points, then the welding process is simple, but the contact force distribution of the wiper lip on the disc is negative
Solution Approach 1:
By extending the weld seam from point-like to band-like along the longitudinal extent, the invention achieves more reliable force distribution and wiping performance without significantly increasing process complexity. The band-like weld seam creates a more robust connection that ensures consistent contact force distribution across the wiper lip.
3Strength
If a flat weld seam is formed over a longitudinal extent, then the force transmission is improved and contact force distribution is uniform, but the welding process becomes more complex
Solution Approach 1:
The invention applies local quality by concentrating the enhanced welding connection specifically at the base connection device where forces are transmitted from the wiper arm to the wiper strip. The band-like weld seam is positioned precisely to optimize force distribution along the support rails, while other parts of the wiper blade maintain their原有 simple structure. This localized approach improves force transmission without requiring complex welding throughout the entire assembly.
4Reliability
If a flat weld seam is formed over a longitudinal extent, then the contact force distribution is uniform, but the welding requires precise energy delivery through through-openings
Solution Approach 1:
The through-openings are positioned locally at specific locations on the base connection device to allow precise energy delivery for weld seam formation. This localized approach ensures that the welding energy is concentrated where needed to create the band-like weld seam, achieving uniform contact force distribution without requiring high precision across the entire welding process. The lateral retaining elements are also positioned to provide localized support during welding.
Solution Approach 2:
The through-openings act as intermediaries that facilitate precise energy delivery from the welding tool to the base connection device and support rail interface. These openings allow the welding energy to be delivered accurately at the critical locations where the weld seam is formed, enabling controlled melt generation and reliable weld seam formation without requiring the entire assembly to be positioned with high 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
The design enhances force transmission from the wiper arm to the wiper strip, reducing pull-off forces and ensuring uniform contact pressure across the wiper lip, leading to improved wiping performance.
Implementation Method 1
The at least one support rail is preferably welded to the base connection device by ultrasonic welding
Implementation Method 2
A plastic adapter unit for linking the wiper blade to a wiper arm is welded to the base connection device
Data Source
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AI summary
The invention relates to a wiper blade for a windscreen wiper, comprising a wiper strip on which at least one support rail (312, 314) is disposed, wherein said support rail has a spring element (412, 415) provided with a plastic sheath (313, 315), and further comprising a base connection device (160), which includes plastic and is welded to plastic sheath (313, 315), wherein a flat weld seam (419, 421) is formed between the base connection device (160) and the at least one support rail (312, 314).