Wiper Mount Segmentation for Force Transmission
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Solution Overview
Problem
Existing rear window windscreen wiper devices face issues with force transmission due to plastic components, leading to potential breakage under snowy or icy conditions, and reinforced designs make it difficult to snap or clip the wiper in place.
Innovation Solution
A wiper mount design with separate molded snap-on and guide elements, featuring a frame-like structure with U-shaped recesses and elastic snap fingers, allows for low-force actuation while transmitting large wiping forces through geometric separation and increased rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the clip connection is reinforced to transmit larger forces, then the force transmission capability is improved, but the actuation forces become too great to be closed or separated manually
Solution Approach 1:
The wiper mount is divided into functionally separate elements: guide projections for force transmission and snap-on projections for connection. The guide projections are designed to be geometrically separate from the snap-on projections, allowing the snap-on elements to be smaller and easier to actuate while the guide projections handle the force transmission. This segmentation resolves the contradiction by distributing functions to appropriately sized components.
Solution Approach 2:
The guide projections act as intermediary elements that mediate between the wiper forces and the snap-on connection. They receive and transmit the wiping forces to the wiper arm while allowing the snap-on projections to maintain a simpler, more easily actuated design. The guide projections serve as the force transmission pathway, enabling the snap-on elements to be smaller without compromising overall strength.
2Reliability
If the snap connection is designed with a larger load-bearing cross-section to transmit greater forces, then the reliability is improved, but the actuation forces increase significantly
Solution Approach 1:
The connection structure is segmented into snap-on projections for reliable connection and guide projections for force transmission. The snap-on projections can be designed with smaller cross-sections since they only need to provide the snap-in connection, while the guide projections handle the heavy force transmission loads. This segmentation allows reliable connection without requiring large actuation forces.
Solution Approach 2:
Different parts of the wiper mount have different structural qualities optimized for their specific functions. The snap-on projections have geometry optimized for easy actuation and connection, while the guide projections have increased rigidity and stiffness optimized for force transmission. This local differentiation of structural properties resolves the contradiction between connection reliability and actuation force.
3Ease of operation
If the clip connection is designed to be simple for easy actuation, then the ease of operation is improved, but the force transmission capability is insufficient under snowy or icy conditions
Solution Approach 1:
The wiper mount structure is segmented into snap-on projections for easy actuation and guide projections for force transmission. The snap-on projections provide simple clip-in operation, while the separate guide projections ensure sufficient force transmission capability even under heavy snowy or icy conditions. This functional segmentation resolves the contradiction between simplicity and strength.
Solution Approach 2:
The guide projections serve as intermediary force transmission elements that protect the simple snap-on connection from bearing the full force loads. They transmit the wiping forces directly to the wiper arm, allowing the snap-on projections to remain simple and easy to actuate while still achieving reliable force transmission under adverse weather conditions.
Data Source
Figure 1~2
Figure 3~4
Figure 4a~4b
AI summary
Window wiper device (1), preferably for a rear windscreen of a motor vehicle, with a wiper arm (2) which executes a wiping movement over a window of the motor vehicle and on which a wiper (3) is held by means of a wiper receptacle (4) which is formed at one end of the wiper arm (2), wherein the wiper receptacle (4) interacts with a receptacle web (5) which is formed on the wiper (3), wherein the wiper receptacle (4) has at least one clip-in extension (6) for clipping in the receptacle web (5) and guide extensions (7) which are spatially separated from the clip-in extension (6) and have the purpose of transmitting the wiper forces to the wiper arm (2).