Microtextured Windscreen Wiper Strip Friction Reduction
Solution Overview
Problem
Conventional windscreen wiper blades face challenges in balancing abrasion resistance, friction, and slip properties, often compromising lifespan and wipe quality, and existing coatings are costly, difficult to apply, and wear out over time.
Innovation Solution
A windscreen wiper device with a longitudinally extending wiper strip featuring a microtextured surface directly integrated into the flexible material, which reduces friction and improves slip properties, allowing for a softer material without compromising lifespan, and includes microtexturing on the channel and hinge portions to prevent debris buildup and on the spoiler to enhance down-force or reduce drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft rubber material is used for the wiper strip, then wipe quality is improved, but frictional resistance increases reducing lifespan
Solution Approach 1:
The patent applies a hydrophobic coating to the wiper strip surface, creating a localized property change. The coating provides low friction and water repellency at the contact surface while the bulk rubber material remains soft for good sealing and wipe quality. This resolves the contradiction by having different properties at different levels: soft rubber for wipe quality, hydrophobic coating for reduced friction and extended lifespan.
Solution Approach 2:
The patent combines soft rubber material with a hydrophobic coating layer to create a composite wiper strip. The rubber provides flexibility and sealing, while the coating provides low friction and water repellency. This composite structure allows the wiper to achieve both good wipe quality (from soft rubber) and extended lifespan (from reduced friction via coating).
2Duration of action of moving object
If a hydrophobic coating is applied to the wiper strip, then friction is reduced and lifespan is extended, but cost increases and the coating may wear out
Solution Approach 1:
The patent modifies the surface properties of the wiper strip by applying a hydrophobic coating, changing parameters such as surface energy, friction coefficient, and water repellency. This allows the base rubber material to remain soft for good wipe quality while the coating provides durable low-friction performance. The parameter changes at the surface level resolve the contradiction between lifespan extension and manufacturing simplicity.
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 microtextured surface enhances wipe quality, reduces friction, and extends the lifespan of the wiper blades while preventing debris accumulation and improving aerodynamics, offering improved performance and manufacturing advantages through reduced internal stresses and easier extrusion.
Implementation Method 1
The microtexturing reduces the friction between the wiper strip and the vehicle's windshield, thereby allowing the wiper strip to be formed of a softer material, thus further improving wipe quality without compromising the windscreen wiper device's lifespan
Implementation Method 2
The microtexturing provides the wiping portion with hydrophobic properties to improve the wiper quality of the windscreen wiper device
Implementation Method 3
The microtexturing reduces the friction between the wiper strip and the carrier to reduce internal stresses within the wiper strip that could otherwise form when the wiper strip is biased into a curved configuration by the carrier
Data Source
AI summary
A windscreen wiper device is provided including a longitudinally extending wiper strip of a flexible material. At least one carrier of a spring-like material operatively supports and biases the wiper strip into a predetermined configuration. The windscreen wiper device further includes a connecting device for connection with a wiper arm. At least a portion of the wiper strip has a microtextured surface formed directly into the flexible material. The microtextured surface may be on, for example, any one of or any combination of a wiping portion, a channel, a hinge portion and a spoiler portion of the wiper strip.