Viscous Coupling Wiper Stop for Wear-Limited Fluid Scraping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Viscous couplings experience premature failure due to wear and abrasion of the wiper, leading to inefficiency and potential breakdown, especially in heavily used systems.
Innovation Solution
Incorporating a stop mechanism that allows the wiper to initially bear against the rotor for efficient fluid scraping, but engages only when significant wear occurs, preventing further contact and maintaining functionality until failure is imminent, thereby reducing the risk of wiper failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wiper continuously bears against the rotor to efficiently scrape fluid, then fluid scraping efficiency is improved, but wear and abrasion increase leading to premature failure
Solution Approach 1:
The stop is pre-positioned at a distance from the rotor such that it will engage with the wiper after a predetermined amount of wear has occurred. This preliminary arrangement allows the wiper to initially contact the rotor for efficient fluid scraping, while the stop stands ready to prevent further contact and protect against premature failure.
Solution Approach 2:
The stop acts as an intermediary element between the wiper and the rotor. It mediates the interaction by allowing initial contact for efficient operation, then intervening to prevent excessive wear when the wiper has worn to a predetermined extent, thus protecting the wiper from failure.
2Reliability
If the stop is positioned to prevent wiper contact with the rotor, then wiper failure is prevented, but fluid scraping efficiency is reduced
Solution Approach 1:
The stop is pre-positioned at a specific distance from the rotor surface, calculated to allow the wiper to wear to a predetermined extent while maintaining efficient fluid scraping. Only after this predetermined wear occurs does the stop engage to prevent further contact, thus balancing efficiency and durability.
Solution Approach 2:
The system transitions from a static stop position to a dynamic wear-compensation mechanism. The stop's effective position changes relative to the rotor as the wiper wears, initially allowing full contact for efficiency, then progressively limiting contact as wear increases, optimizing the balance between scraping efficiency and wiper protection throughout the component's life.
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
Substantially reduces the risk of failure in heavily used viscous couplings without compromising efficiency in less used ones, ensuring continued operation by preventing excessive wear-related issues.
Implementation Method 1
a wiper (28), which, in operation, bears against a rotor (22) arranged in a working chamber (60), so as to scrape off fluid
Data Source
AI summary
Disclosed is a viscous coupling that has a housing that carries ribs that are arranged concentrically about a central axis. A rotor is provided that can rotate relative to the housing about the central axis in a predetermined direction. The rotor also carries ribs, and the ribs of the housing and the rotor are arranged in a working chamber surrounded by the housing. Also provided is a fluid reservoir. A fluid discharge line leads from the working chamber to the fluid reservoir. A wiper is moveably arranged between the housing and the rotor and scrapes fluid from the rotor and feeds it to the fluid discharge line. A stop is provided for the wiper and is arranged next to the rotor.