Final Drive Seal Guard Labyrinth Radius Design
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Solution Overview
Problem
Final drive assemblies in machines operating in debris-filled environments face issues with debris penetrating the seals, leading to lubricant loss and damage, and the existing protective measures are often difficult to maintain and prone to wear.
Innovation Solution
A seal protection strategy involving a labyrinthine seal protection passageway with an opening positioned at a greater radius than the minimum valley radius, combined with guard ring halves that cover bolt ends and a drain passage to manage liquid debris, enhances debris exclusion and reduces maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a steel labyrinth integrated with Kevlar rope and a protective clam shell are used to guard the seal protection passageway, then debris protection is improved, but maintenance difficulty and complexity increase
Solution Approach 1:
The patent extracts the seal protection passageway from the traditional enclosed labyrinth-clamshell structure and opens it to the outer surface at a strategic location. This allows the passageway to function as both a protective route for the seal and a accessible channel for debris removal, eliminating the need for complex disassembly of protective shells during maintenance.
Solution Approach 2:
The open seal protection passageway acts as an intermediary structure that serves dual purposes: it protects the seal by providing a dedicated protected route while simultaneously serving as an access channel for debris removal. This mediator structure connects the internal seal area with the external environment in a controlled manner.
2Ease of operation
If the seal protection passageway opening is positioned at the minimum valley radius, then ease of debris removal is improved, but seal exposure to debris increases
Solution Approach 1:
The patent applies local quality by positioning the seal protection passageway opening at a specific location on the outer surface that balances accessibility with protection. The opening is strategically placed to allow debris removal while the labyrinthine structure maintains higher protection levels at critical seal areas, creating different protection qualities in different locations.
3Reliability
If traditional seal guarding structures are used, then seal protection is improved, but serviceability and maintenance access worsen
Solution Approach 1:
The patent extracts the seal protection passageway from the enclosed traditional structure and opens it to the exterior, allowing maintenance personnel to access and clear debris from the passageway without disassembling protective shells or labyrinths, significantly improving serviceability while maintaining seal protection.
Solution Approach 2:
The open seal protection passageway enables self-service maintenance by allowing operators to easily remove debris from the passageway opening without requiring specialized tools or extensive disassembly, making routine maintenance simple and quick.
Data Source
AI summary
A final drive assembly is used to support a track chain on a track type machine. The final drive assembly includes a sprocket hub mounted for rotation on a fixed hub. A seal is positioned between the fixed hub and the sprocket hub. The fixed hub and the sprocket hub define a seal protection passageway that extends between an outer surface and the seal. The seal protection passageway includes a labyrinth located between an annular attachment flange and the seal along a rotation axis of the sprocket hub. The outer surface includes a valley between a sprocket mount of the sprocket hub and a machine mount of the fixed hub. The seal protection passageway opens at a greater radius than a minimum radius of the valley.