Windshield Wiper Pivot Axis Tilt for Curved Glass
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Solution Overview
Problem
Conventional windshield wipers fail to effectively wipe aerodynamically curved windshields, particularly in the A-pillar area of commercial vehicles, due to the lifting of wiper blades caused by greater curvature, resulting in poor wiping quality and incomplete coverage.
Innovation Solution
The windshield wiper features a pivot axis and wiping plane aligned at an angle of inclination α, allowing the wiper to intersect and reduce the normal error angle in the outer wiping position, thereby improving wiping quality and expanding the wiping field towards the vehicle's A-pillars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wiper systems with perpendicular pivot axes are used, then the wiping mechanism is simple and reliable, but the wiper blade lifts off the curved windshield in the A-pillar area, resulting in poor wiping quality and incomplete coverage
Solution Approach 1:
The patent changes the geometric parameter of the pivot axis by tilting it at a specific angle (15-25 degrees) relative to the perpendicular direction. This parameter modification allows the wiper blade to maintain optimal contact angle with the aerodynamically curved windshield surface throughout the wiping stroke, preventing blade lift-off in the A-pillar area while ensuring complete coverage of the curved surface
2Reliability
If the pivot axis is tilted at an angle of inclination to reduce the normal error angle, then the wiping quality in outer areas is improved, but the device complexity increases
Solution Approach 1:
The invention modifies a single geometric parameter (the tilt angle of the pivot axis) within a specific range (15-25 degrees) to achieve optimal wiping performance. This parameter change is implemented through the bearing point configuration and does not require additional mechanical components, control systems, or complex mechanisms, thereby improving wiping quality while maintaining device simplicity
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3C
AI summary
The invention relates to a windshield wiper (S) for a curved windshield (WSS) for a vehicle, preferably a commercial vehicle, in particular a truck or a bus. The windshield (WSS) comprises a central area (A) and two lateral outer areas (B) with a particularly greater curvature than in the central area (A). The windshield wiper (S) comprises a wiping element (2) that can act/be aligned in a wiping plane (1) for wiping the windshield (WSS) and a bearing point (3) that defines a pivot axis (4) about which the windshield wiper (S) can pivot from a parked position to an outer wiping position. The windshield wiper (S) is characterized in particular by the fact that the pivot axis (4) and the wiping plane (1) are inclined relative to each other at an angle (α).