Wiper Blade Rubber Holder Segmented Draft Slopes
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Solution Overview
Problem
Conventional wiper blades experience uneven transmission of urging force from the wiper arm to the backing, affecting wiping performance due to the continuous draft slope in the coupling lever, which is manufactured through injection molding.
Innovation Solution
A wiper blade design featuring a rubber holder with a backing accommodation slot and blade rubber accommodation slot, both with strategically placed draft slopes and a slit, facilitating even force transmission and improved rigidity and elasticity, allowing for enhanced wiping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single continuous draft slope is used in the backing accommodation slot for easy mold removal, then manufacturing ease is improved, but uneven transmission of urging force occurs affecting wiping performance
Solution Approach 1:
The backing accommodation slot is divided into multiple sections with different draft slopes rather than using a single continuous draft slope. The slot includes a first section with a first draft slope and a second section with a second draft slope, allowing segmented force transmission that ensures even urging force distribution while maintaining manufacturability through standard injection molding processes.
2Ease of manufacture
If the parting line is positioned at the longitudinal end of the backing accommodation slot, then mold removal is simplified, but urging force transmission becomes uneven
Solution Approach 1:
Different regions of the backing accommodation slot are assigned different draft slope characteristics optimized for their specific functions. The first section has a first draft slope optimized for one aspect of force transmission, while the second section has a second draft slope optimized for another aspect, creating local quality variations that collectively achieve uniform urging force transmission throughout the backing.
Data Source
AI summary
A wiper blade extends in the longitudinal direction and includes blade rubber, a plate spring-like backing, and a rubber holder. The blade rubber wipes a surface to be wiped. The backing imparts rigidity and elasticity to the blade rubber. The rubber holder holds both the longitudinally intermediate section of the blade rubber and the longitudinally intermediate section of the backing. The rubber holder has a backing housing hole for housing and retaining the backing. The backing housing hole longitudinally extends through the rubber holder. A parting line is set at the longitudinal center of the backing housing hole.