Windscreen Wiper Arm Nozzle Dynamics
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Solution Overview
Problem
Existing windscreen wiper systems are inefficient in cleaning the windshield due to the nozzle emitting washing fluid at a large distance, resulting in excessive liquid consumption and potential damage to the car's body from corrosive components.
Innovation Solution
A windscreen wiper arm with a U-shaped cross-section and a detachably connected nozzle inside the wiper arm member, allowing the nozzle to follow the oscillatory movement and spray washing fluid directly onto the windshield from multiple locations, reducing liquid consumption and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the nozzle is fixedly mounted on the bonnet at a large distance from the windscreen, then the washing fluid can be sprayed onto the windscreen, but a relatively large amount of washing fluid does not effectively reach the wiping pattern and excessive liquid consumption occurs
Solution Approach 1:
The nozzle is made detachably connectable to the wiper rod, allowing it to move together with the wiper arm and follow the oscillatory movement. This dynamic positioning ensures the nozzle remains close to the windscreen throughout the wiping cycle, directing washing fluid precisely onto the wiping pattern and reducing fluid consumption.
Solution Approach 2:
The wiper rod serves as an intermediary carrier that connects the nozzle to the wiper arm mechanism. By mounting the nozzle on the wiper rod inside the U-shaped cross-section, the nozzle is transported along with the wiper arm's oscillatory motion, maintaining optimal positioning near the windscreen surface.
2Object-affected harmful factors
If the nozzle is positioned at a large distance from the windscreen, then the washing fluid can be sprayed, but the corrosive components may damage the car's body parts such as paint, rubber, car wax and plastics
Solution Approach 1:
The detachable connection to the wiper rod enables the nozzle to dynamically follow the wiper arm's oscillatory movement, maintaining a consistent close proximity to the windscreen. This prevents washing fluid from contacting other car body parts, eliminating the harmful corrosive effects on paint, rubber, car wax and plastics.
3Productivity
If the nozzle is detachably connected to the wiper rod inside the U-shaped cross-section, then the nozzle can follow the oscillatory movement and spray washing fluid directly onto the windscreen, but the nozzle mounting structure becomes more complex
Solution Approach 1:
The nozzle is integrated with the wiper rod through a detachable connection, merging the spraying function with the existing wiper arm oscillation mechanism. This allows the nozzle to automatically follow the wiper's motion path without requiring separate positioning systems, maintaining cleaning efficiency while limiting structural complexity.
Solution Approach 2:
The wiper rod serves multiple functions: it acts as the structural element of the wiper arm, the mounting carrier for the nozzle, and the mechanism that transports the nozzle through oscillatory movement. This multi-functionality reduces the need for additional components, balancing productivity improvement with acceptable device complexity.
Data Source
AI summary
A windscreen wiper arm comprising a wiper arm member having a substantially U-shaped cross-section arranged to be pivotally connected to a mounting head mounted on a drive shaft, and a wiper rod having a first end rigidly connected to and extending inside said wiper arm member and a second end arranged to be connected to an elongated wiper blade to be placed in abutment with a windscreen to be wiped. The windscreen wiper arm includes a nozzle for spraying a washing liquid onto said windscreen to be wiped, where said nozzle is detachably connected to said wiper rod inside the U-shaped cross-section of the wiper arm member.