Wiper Blade Cover Member Fluid Flow Segmentation
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Solution Overview
Problem
Existing wiper blades suffer from low visibility during high-speed vehicle travel due to fluid penetration through the hollow structure between the cover member and the wiper strip, causing streaks on the windshield.
Innovation Solution
A wiper blade design incorporating a flow regulating means, including a flow regulating plate and strategically designed cover member openings, to limit fluid flow in the longitudinal direction within the interior space, reducing fluid intrusion and discharge towards the wiping surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lever member is received through the cover opening of the cover member, then the cover member protects the wiper strip and improves total appearance, but a hollow structure exists due to the interior space between the cover member and the wiper strip, causing fluid penetration and discharge toward the wiping surface at high vehicle speeds
Solution Approach 1:
The interior space between the cover member and wiper strip is divided into multiple separate spaces by partition walls extending from the cover member. This segmentation prevents fluid from flowing continuously through the hollow structure, thereby eliminating the harmful effect of fluid discharge toward the wiping surface while maintaining the protective function of the cover member
Solution Approach 2:
Partition walls are introduced as intermediary structures within the interior space. These partition walls act as mediators that block the direct path of fluid flow from the cover opening to the wiping surface, preventing fluid discharge while allowing the cover member to maintain its protective function
2Device complexity
If the hollow structure with interior space is maintained, then the cover member can be simplified in design, but fluid flows along the interior space toward the distal end of the wiper blade and collides against holding parts, forming streaks on the wiping surface
Solution Approach 1:
The interior space is segmented into multiple separate spaces using partition walls, which prevents fluid from flowing continuously toward the distal end and colliding with holding parts. This segmentation approach maintains relative structural simplicity while effectively preventing streak formation on the wiping surface
3Object-affected harmful factors
If the interior space is completely closed, then fluid flow is completely prevented, but the cover member cannot receive the lever member and the wiper strip cannot be held properly
Solution Approach 1:
The interior space is divided into multiple separate spaces that remain open to the exterior, allowing the lever member to be received and the wiper strip to be held properly. At the same time, these segmented spaces prevent continuous fluid flow, achieving both assembly ease and fluid flow prevention
Solution Approach 2:
Different regions of the interior space are given different qualities through the partition walls. The spaces near the cover opening allow fluid entry but the partitioned structure prevents continuous flow toward the wiping surface, while maintaining open access for assembly operations
Data Source
AI summary
A wiper blade includes a wiper strip, a lever assembly and a cover member. The lever assembly has a connecting arrangement and holding claws. The connecting arrangement is connected to a wiper arm. The holding claws hold the wiper strip. The cover member has a cover opening, which is opened on a wiper strip side thereof. The cover member receives the lever assembly through the cover opening. In an interior space between the cover member and the wiper strip, holder end side openings, each of which is a part of the cover opening, are covered by two connecting arrangement end side cover parts. In this way, in the interior space between the cover member and the wiper strip, spaces, into which fluid intrudes, are reduced.