Wiper Blade Washer Unit With Compact Elastic Check Valve
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Solution Overview
Problem
The structure of existing wiper blades, particularly the washer nozzle, is complicated, making assembly difficult and leading to a large size, which hinders efficient operation and miniaturization.
Innovation Solution
A wiper blade design featuring a simplified check valve structure with a hollow, elastically deformable check valve that opens and closes based on internal pressure changes, integrated into a washer unit with a slit that simplifies assembly and reduces the overall size of the washer unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve with valve body and coil spring is accommodated within the nozzle body, then the check valve function is achieved, but the structure of the washer nozzle becomes complicated and its size increases
Solution Approach 1:
The invention extracts the coil spring from the nozzle body structure, removing the problematic component that caused complexity. The check valve is reduced to just the valve body with an elastic deformable portion, eliminating the need for separate spring accommodation space while maintaining the check valve function through pressure-driven elastic deformation.
Solution Approach 2:
The invention changes the physical state and properties of the valve body by making it elastically deformable. This allows the valve body itself to function as both the structural component and the elastic element, replacing the need for a separate coil spring. The material properties are modified to enable elastic deformation under pressure differential.
2Reliability
If a check valve with valve body and coil spring is accommodated within the nozzle body, then the check valve function is achieved, but assembly work becomes difficult
Solution Approach 1:
By removing the coil spring from the assembly, the number of components to be assembled is reduced. The simplified check valve structure with only the elastic deformable valve body requires fewer assembly steps and eliminates the need to install and position the spring, significantly improving assembly workability.
Solution Approach 2:
The invention merges the functions of the valve body and the coil spring into a single integrated component. The elastic deformable portion of the valve body simultaneously provides structural support and elastic restoring force, eliminating the need for separate spring installation and simplifying the assembly process.
3Reliability
If a check valve with valve body and coil spring is accommodated within the nozzle body, then the check valve function is achieved, but the washer nozzle size becomes large
Solution Approach 1:
Extracting the coil spring from the nozzle body eliminates the space required for spring accommodation. This significantly reduces the internal volume of the nozzle body needed for check valve functionality, enabling miniaturization of the overall washer nozzle assembly.
Solution Approach 2:
By combining the structural and elastic functions into a single valve body component, the invention eliminates the additional volume required for separate spring housing. The integrated design allows the check valve to occupy minimal space within the nozzle body, achieving compact dimensions.
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
This design enhances assembly workability and achieves miniaturization of the washer unit while maintaining effective cleaning performance by simplifying the check valve structure and reducing the overall size of the washer nozzle.
Implementation Method 1
a check valve which is disposed on an upstream side of the flow path, and which is hollow and elastically deformable. The check valve has a slit. The slit is opened against a restoring force of the check valve when an internal pressure of the check valve increases, and is closed by the restoring force of the check valve when the internal pressure of the check valve decreases
Data Source
AI summary
The wiper blade includes a washer unit mounted on a second long side wall portion of a connecting member and spraying a washer fluid toward a surface of a windshield glass. The washer unit includes a cover member disposed facing the second long side wall portion, a valve member disposed between the second long side wall portion and the cover member, and a flow path which is disposed between the cover member and the valve member and through which the washer fluid W flows. The valve member includes a hollow check valve which is disposed on the upstream side of the flow path and is elastically deformable. The check valve has a slit, which is opened against the restoring force of the check valve when the internal pressure of the check valve increases, and is closed by the restoring force of the check valve when the internal pressure of the check valve decreases.