Purgeable Labyrinth Axle Hub Seal Design
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Solution Overview
Problem
Seal failures in axles and hubs of wheeled vehicles lead to contamination and damage from debris and moisture in severe environments, such as mining and construction, due to leakage of lubricants and entry of destructive substances.
Innovation Solution
A purgeable labyrinth seal design featuring an axle annular member and a hub annular member with a cooperative labyrinth gallery and a grease fitting that communicates lubricant outwardly during rotation, restricting contaminants and allowing periodic purging of used grease, thereby maintaining a clean and lubricated environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional seal is used to protect the hub-axle connection, then lubrication is provided and contaminants are blocked, but the seal may fail in severe environments leading to leakage and contamination
Solution Approach 1:
The seal is divided into multiple labyrinthine sections with alternating seal members and retainer members, creating a segmented path that contaminants must navigate. This segmentation increases the complexity of the contamination path while maintaining lubricant containment, directly addressing the reliability issue in severe environments.
Solution Approach 2:
The labyrinth seal structure features nested concentric rings and galleries where smaller seal members are positioned within larger structural elements. The seal members are nested between the hub and axle, creating multiple containment zones that progressively block contaminants while allowing lubricant circulation.
2Loss of substance
If the seal is made more robust to prevent leakage, then lubricant retention improves, but the seal structure becomes more complex and harder to maintain
Solution Approach 1:
The seal incorporates a purge feature that enables periodic removal of contaminated lubricant through the grease fitting. This periodic purging action maintains seal effectiveness without requiring a completely sealed immutable structure, balancing lubricant retention with manageable complexity through routine maintenance intervals.
Solution Approach 2:
The labyrinth gallery structure allows used and contaminated lubricant to be discarded through the purge feature while fresh lubricant is replenished via the grease fitting. This discarding and recovering mechanism maintains lubrication effectiveness without requiring permanent sealing, reducing structural complexity.
3Ease of manufacture
If a simple seal structure is used, then manufacturing and installation are easier, but the seal fails under severe operating conditions
Solution Approach 1:
The seal is segmented into modular seal members and retainer members that can be manufactured separately and assembled together. This segmentation allows each component to be manufactured using standard processes while the assembled labyrinthine structure provides enhanced performance in severe environments, balancing ease of manufacture with reliability.
Solution Approach 2:
The labyrinthine seal structure serves multiple functions simultaneously: it blocks contaminants, retains lubricant, provides circulation paths, and enables purging. This multi-functionality is achieved through the integrated design of seal members, retainer members, and galleries that work together, reducing the need for separate components and simplifying manufacturing while enhancing reliability.
4Object-affected harmful factors
If lubricant is retained completely within the seal, then contamination is prevented, but used lubricant cannot be purged and fresh lubricant cannot be replenished
Solution Approach 1:
The labyrinth gallery acts as an intermediary space between the sealed hub-axle connection and the external environment. It allows controlled interaction where contaminants are blocked from the critical interface while permitting lubricant circulation and purging through the grease fitting, mediating between contamination protection and maintenance accessibility.
Solution Approach 2:
The purge feature enabled by the labyrinth gallery structure allows used lubricant to be discarded from the system through the grease fitting while fresh lubricant is recovered and replenished. This discarding and recovering mechanism maintains contaminant exclusion at the critical interface while enabling easy operation for lubricant management.
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 purgeable labyrinth seal effectively prevents contamination and maintains lubrication by restricting debris and moisture entry while allowing for the periodic ejection and recharging of grease, enhancing the durability and performance of axle-hub connections in harsh conditions.
Implementation Method 1
A purgeable labyrinth axle/hub seal comprises an axle annular member held by an axle mount and a hub annular member held by a hub mount, which axle annular member and hub annular member matingly engage to define the seal... Lubricant communicates through the labyrinth gallery outwardly of the seal during rotation of the hub relative to the steering axle.
Data Source
AI summary
A purgeable labyrinth axle/hub seal for a motor vehicle with an axle annular member that attaches to an end portion of an axle and a hub annular member that attaches to a wheel hub and matingly connect for defining a cavity that receives grease and a labyrinth gallery for a grease path from the cavity, to seal the connection of the axle and hub from water, dirt and other contaminants.