Wiper Structure With Sliding Blocks For Curved Windshields
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Solution Overview
Problem
Existing wiper structures struggle to maintain even pressure on vehicle windshields with varying curvatures, leading to inconsistent attachment and ineffective dirt removal.
Innovation Solution
A wiper structure featuring a main frame, secondary frames with flexible sheets and engaging frames, where sliding blocks with neck bars pass through openings in the flexible sheets, allowing for balanced force distribution and even pressure on the wiper blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rigid wiper blade structure is used, then the structure is simple and easy to manufacture, but the pressure distribution on curved windshields is uneven
Solution Approach 1:
The wiper blade incorporates a flexible sheet with sliding blocks that can dynamically adjust their positions along sliding troughs. This dynamic structure allows the blade to adapt its shape and pressure distribution to match the curvature of the windshield, resolving the contradiction between structural simplicity and pressure uniformity.
Solution Approach 2:
The flexible sheet changes its physical parameters (bending shape, local curvature) in response to external forces from the windshield surface. This parameter change enables the rigid-looking structure to achieve conformal contact with curved surfaces while maintaining manufacturing simplicity.
2Stress or pressure
If a flexible wiper blade structure is used, then the pressure distribution on curved windshields is even, but the structure becomes complex
Solution Approach 1:
The wiper blade is segmented into multiple discrete components: a flexible sheet, multiple sliding blocks, and engaging frames. Each segment can independently adjust its position, allowing complex pressure distribution control while keeping individual components simple and manageable.
Solution Approach 2:
The sliding blocks act as intermediaries between the flexible sheet and the engaging frames. They transmit forces while allowing relative movement, enabling the system to achieve even pressure distribution without requiring a fully complex flexible mechanism.
3Ease of manufacture
If the sliding block diameter is large, then the structure is simpler to manufacture, but the sliding block cannot move freely in the sliding trough
Solution Approach 1:
The sliding block has different dimensional characteristics in different directions: a larger diameter for structural stability and ease of manufacture, and a smaller passing diameter in the sliding direction to enable free movement. This local quality differentiation resolves the contradiction between manufacturing simplicity and operational mobility.
4Strength
If the wiper blade is pressed hard on the glass, then the attachment is stronger, but the pressure becomes uneven on curved surfaces
Solution Approach 1:
The engaging frames can dynamically adjust their pressing force distribution through the sliding blocks moving along the sliding troughs. This allows the blade to maintain strong overall attachment while distributing pressure evenly across curved surfaces, preventing both weak attachment and uneven pressure.
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 balanced pressure distribution ensures the wiper blade is evenly pressed onto the windshield, enhancing its attachment and effectiveness in sweeping operations, particularly on curved surfaces.
Implementation Method 1
The sliding block is slidable in each sliding trough with a change of an external force exerted on corresponding one of the secondary wiper frames
Data Source
AI summary
The disclosure is a wiper structure. The main wiper frame includes a fixing seat. A pair of secondary wiper frames is connected to two ends of the main wiper frame. Each secondary wiper frame includes a flexible sheet. The flexible sheet is disposed with sliding troughs. A length of the sliding trough is greater than a width of the sliding trough. Multiple engaging frames are evenly disposed on each secondary wiper frame. Each engaging frame includes a pressing wing and a sliding block. The sliding block includes a neck bar with a passing diameter. The passing diameter is less than the trough width. The sliding block of each engaging frame passes through the opening and abuts against each sliding trough through the neck bar. The sliding block is slidable in each sliding trough with a change of an external force exerted on corresponding one of the secondary wiper frames.