Asymmetric Wiper Middle Blade Structure to Prevent Jumping
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Solution Overview
Problem
Existing wiper structures suffer from insufficient or excessive downward pressure, leading to ineffective windshield cleaning and potential jumping during the brushing process, and are prone to wear and noise due to poor structural design.
Innovation Solution
A middle blade structure with a single-sided bending design, featuring a pivot plate and outer arm arrangement, and an inner angle between 120 to 180 degrees, which prevents excessive pressure and enhances structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the downward pressure of the wiper is increased to improve cleaning effectiveness, then the cleaning ability is improved, but the wiper may generate loud frictional sound or jump during the brushing process
Solution Approach 1:
The wiper blade incorporates a flexible middle section that can dynamically adjust its curvature during operation. This dynamic flexibility allows the blade to adapt to varying windshield surfaces and pressure conditions, maintaining optimal contact without excessive force that would cause jumping or noise
Solution Approach 2:
The patent changes the physical parameter of the middle blade structure by introducing a bent part with a specific inner angle (120-180 degrees). This geometric parameter change creates a built-in pressure distribution mechanism that provides sufficient downward force for cleaning while preventing excessive pressure that would lead to harmful friction and jumping
2Object-generated harmful factors
If the downward pressure of the wiper is decreased to avoid frictional sound and jumping, then the noise and instability are reduced, but the cleaning ability becomes insufficient
Solution Approach 1:
The wiper blade employs an asymmetric structure where the middle section has a bent part with unequal arm lengths (first inner arm longer than second inner arm). This asymmetry creates a natural pressure gradient along the blade, ensuring adequate contact pressure for cleaning while distributing force to prevent concentrated excessive pressure that would cause noise and jumping
Solution Approach 2:
The bent part of the middle blade structure introduces a controlled curvature with an inner angle between 120 and 180 degrees. This curvature allows the blade to conform better to the windshield surface, maintaining consistent contact pressure for effective cleaning without the excessive force that leads to frictional noise and jumping
Data Source
AI summary
A middle blade structure of a wiper includes a pivot plate and an outer arm. The pivot plate includes a pivot part disposed thereon. The pivot part includes a first inner arm extended from one end thereof, the first inner arm includes a fixed hole defined thereon, the pivot part including a second inner arm extended from another end thereof, a length of the second inner arm is shorter than a length of the first inner arm, the second inner arm including a bent part disposed on one end thereof, wherein the pivot part, the first inner arm, and the second inner arm are arranged on a same straight line. The outer arm, extended from the bent part, and including a connection part disposed on one end thereof, the connection part including a connection hole defined thereon.