Windscreen Wiper Arm Segmented Mounting Head Corrosion Prevention
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Solution Overview
Problem
Existing windscreen wiper arms are prone to corrosion at the interconnection of the mounting head and arm member, leading to potential blockage of pivotal movement and corrosion flow.
Innovation Solution
The design incorporates a partly open ring with interruptions around the transverse bush on the mounting head, allowing paint to enter between the mounting head and arm member surfaces, ensuring complete coverage and preventing corrosion, with a rivet pivot pin and plastic arm member for added protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mounting head and arm member are connected with tight-fitting surfaces, then structural strength and stability are improved, but corrosion resistance deteriorates due to trapped moisture and lack of paint penetration
Solution Approach 1:
The ring is segmented into a partly open structure with interruptions, dividing what would be a continuous barrier into discrete sections. This allows paint to penetrate through the interruptions to the interconnection surfaces while maintaining structural integrity and strength of the overall assembly.
Solution Approach 2:
The ring structure is designed with different properties in different locations: the main body of the ring provides structural strength and stability, while the interruptions in the ring allow paint penetration and corrosion protection at specific critical locations (the interconnection surfaces between mounting head and arm member).
2Stability of the object's composition
If a closed ring is used around the transverse bush, then structural completeness is improved, but paint penetration capability deteriorates
Solution Approach 1:
The ring is intentionally designed as a partly open ring with interruptions rather than a complete closed ring. This segmentation maintains sufficient structural stability while creating pathways for paint to reach the interconnection surfaces between the mounting head and arm member.
Solution Approach 2:
The partly open ring acts as an intermediary structure that balances two competing requirements: it provides structural completeness and stability while simultaneously allowing paint penetration through its interruptions. The ring mediates between the need for structural integrity and the need for corrosion protection.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A windscreen wiper arm (1), particularly for automobiles, comprising a mounting head (2) mountable on a drive shaft (3) and an arm member (4) pivotally connected to the mounting head (2) by means of a pivot pin (5), wherein the arm member (4) has a substantially U-shaped cross-section near said pivot pin (5) comprising two side walls (6,7), wherein a part of the mounting head (2) extends between the side walls and beyond said pivot pin (5), and wherein said part is provided with opposite surfaces (8,9) each facing towards a respective side wall of the arm member (4), with the special feature that each surface of said part of said mounting head (2) is positioned spaced-apart from its respective side wall of said arm member (4), so as to allow paint to enter a space defined between each surface of said part of said mounting head (2) and its respective side wall of said arm member (4).