Rainwater-Reserving Wiper Blade Tip to Prevent Centrifugal Flow
Solution Overview
Problem
Conventional windshield wiper blades allow trapped rainwater to escape due to centrifugal force, reducing visibility by flowing off the windshield.
Innovation Solution
A wiper blade design featuring rainwater reserving portions on the tip end of the lip portion, with a concave rearward surface and reduced thickness and stiffness from the bottom to the tip, preventing rainwater escape and maintaining visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiper portion is moved on the windshield surface to remove rainwater, then the wiping function is achieved, but the trapped rainwater flows off the windshield due to centrifugal force, reducing visibility
Solution Approach 1:
The patent extracts the rainwater retention function from the main wiper body by adding a separate rainwater reserving portion. This reserving portion is formed as a protrusion extending from the wiper portion, creating a dedicated space that captures and holds rainwater separately from the wiping action, preventing it from flowing off the windshield.
Solution Approach 2:
The rainwater reserving portion extends in a direction substantially perpendicular to the wiping direction. This dimensional change creates a three-dimensional structure where the reserving portion protrudes outward from the wiper portion, allowing rainwater to be captured and held in a different spatial dimension rather than along the wiping path.
2Adaptability or versatility
If the tip end portion of the lip portion is made thinner for flexibility, then the wiper can conform to the windshield surface, but the tip end turns over during movement, causing rainwater to escape
Solution Approach 1:
The patent applies local quality by creating a rainwater reserving portion specifically at the tip end region of the lip portion. This localized structure provides enhanced stability and rainwater retention capability exactly where needed (at the tip end), while the rest of the wiper portion maintains its original thin, flexible design for conforming to the windshield surface.
3Reliability
If rainwater is trapped by the wiper portion, then the wiping effectiveness is improved, but the trapped rainwater escapes due to centrifugal force during movement
Solution Approach 1:
The patent converts the harmful effect of centrifugal force (which causes rainwater to escape) into a beneficial function. The rainwater reserving portion is specifically designed to utilize centrifugal force to press rainwater against the inner surface of the reserving portion, thereby enhancing rainwater retention rather than allowing escape. The centrifugal force that would normally be harmful is now harnessed to improve the sealing and retention effect.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The rainwater reserving portions effectively retain trapped water, preventing it from flowing off the windshield, thus maintaining visibility and preventing the tip end from turning over during movement.
Implementation Method 1
the rainwater etc. trapped by the wiper portion 4 flows in a direction A from a free end portion 4a of the wiper portion 4 to the surface of the windshield by the centrifugal force applied to the trapped rainwater etc.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
[Task] A conventional wiper blade has such drawbacks that during the wiper portion is moved on the surface of the windshield in order to remove rainwater etc. attached on the surface of the windshield, the rainwater etc. trapped by the wiper portion flows from a free end portion of the wiper portion to the surface of the windshield by the centrifugal force applied to the trapped rainwater etc., so that the visibility of the windshield is lowered. [Manner for solving the Task] The wiper device of the present invention comprises a wiper portion having a lip portion sliding on a surface of the vehicle windshield for wiping the surface of the windshield, and a rainwater reserving portion formed on one side surface of a tip end portion of the lip portion, the rainwater reserving portion being extending normally to and outwardly from one side surface of the tip end portion of the lip portion and having a concave rearward surface. The concave surface and an end surface of the rain water receiving portion form a sharp tip end.