Sealed Windshield Wiper Structure for Moisture Isolation
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Solution Overview
Problem
The existing windshield wiper structures are not airtight, leading to rainwater penetration and corrosion of the metal elastic sheet, which shortens the service life and causes loss of elastic force, especially in icy environments.
Innovation Solution
A sealed type windshield wiper structure is designed with a waterproof cover, a carrying seat, and end plugs to isolate the elastic piece from external moisture, using thermoplastic vulcanization (TPV) for the waterproof cover that maintains strength and flexibility, and includes a rubber wiper with a piercing strip and scraping strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the windshield wiper uses a non-sealed combination structure of wiper cover and metal elastic sheet, then the structure is simple and easy to manufacture, but rainwater penetrates and corrodes the metal elastic sheet, shortening service life
Solution Approach 1:
The patent implements nesting by placing the metal elastic sheet inside the waterproof cover, which is further sealed by end plugs at both ends. This nested structure protects the metal elastic sheet from rainwater corrosion while maintaining a relatively simple overall design. The waterproof cover encapsulates the elastic component, creating a protected internal environment.
Solution Approach 2:
The patent employs a waterproof cover made of flexible material that envelops the metal elastic sheet. This flexible shell provides waterproof protection while allowing the elastic sheet to maintain its functional movement. The cover acts as a protective barrier against moisture ingress.
2Reliability
If the windshield wiper uses a sealed structure with waterproof cover and end plugs, then moisture ingress is prevented and elastic force is maintained, but the structure becomes more complex
Solution Approach 1:
The sealing structure is segmented into distinct functional components: the waterproof cover that encloses the metal elastic sheet, and the end plugs that seal both ends of the cover. This segmentation allows each component to perform its specific sealing function independently, making the overall sealing system more manageable and effective.
Solution Approach 2:
The waterproof cover acts as an intermediary element between the metal elastic sheet and the external environment. It mediates the protection by creating a barrier that prevents direct contact between rainwater and the elastic sheet, while still allowing the sheet to function within the enclosed space.
3Strength
If the waterproof cover uses uniform wall thickness, then manufacturing is simple, but the structure lacks sufficient strength and flexibility, causing wrinkling and poor appearance
Solution Approach 1:
The waterproof cover is designed with non-uniform wall thickness, where the top wall has greater thickness than the side walls. This local quality variation provides enhanced strength and stiffness at the top wall to prevent wrinkling and maintain appearance, while the thinner side walls retain sufficient flexibility for assembly and function. This differential thickness optimization balances structural integrity with manufacturing feasibility.
Data Source
AI summary
This disclosure provides a sealed type windshield wiper structure (1). The carrying seat (20) is combined on the hooking seat (10). The carrying seat (20) includes a carrying board (21) and a carrying frame (22). The carrying board (21) includes a through slot (210), and the carrying frame (22) includes an accommodating slot (220). The elastic piece (30) is inserted in the through slot (210). The waterproof cover (40) includes a shell (41), an inner space (32) and an outer space (43) The carrying seat (20) is inserted in the inner space (42). The rubber wiper (50) includes a piercing strip (51) and a scraping strip (52). The piercing strip (51) is inserted in the outer space (43), and the scraping strip (52) is exposed from the waterproof cover (40) to configure the sealed type windshield wiper structure (1).