Self-Lubricated Track Roller Assembly for Excavators
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Solution Overview
Problem
Track rollers on track-type machines, such as excavators and tractors, face high stress and wear due to operating conditions, leading to frequent lubricant leakage and increased service costs, as well as complex manufacturing processes and high part counts in existing designs.
Innovation Solution
A track roller assembly featuring self-lubricated bushings and a retention pin, with a shaft that rotates relative to collars, and sealed clearance gaps to prevent lubricant leakage and reduce wear, eliminating the need for external lubrication and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid lubricant channels and ports are used in track roller assembly, then lubrication is provided to reduce wear, but lubricant leakage occurs under extreme operating conditions
Solution Approach 1:
The patent removes liquid lubricant channels and ports from the track roller assembly, eliminating the source of lubricant leakage. Instead of using liquid lubrication systems that require seals and channels prone to failure, the invention employs a solid lubricant coating applied directly to the bearing surface, thereby extracting the harmful lubricant delivery system while preserving the lubrication function.
Solution Approach 2:
The track roller assembly uses a solid lubricant coating that is self-contained and does not require external lubricant supply systems. The solid lubricant is applied directly to the bearing surface and provides continuous lubrication without needing channels, ports, or seals, making the system self-sufficient and eliminating leakage issues.
2Reliability
If traditional bearing assemblies with liquid lubrication are used, then lubrication function is achieved, but service costs increase due to frequent leakage repairs
Solution Approach 1:
The patent eliminates the complex liquid lubrication system with its channels, ports, and seals by using a solid lubricant coating. This extraction of the problematic lubricant delivery system reduces maintenance needs and service costs while maintaining effective lubrication function through the solid coating.
Solution Approach 2:
The solid lubricant coating is applied directly to the bearing surface and provides lubrication for the service life of the track roller. This approach uses a simple, cost-effective coating method rather than expensive liquid lubrication systems that require periodic maintenance and repair, effectively treating the lubricant as a consumable applied during manufacturing.
3Reliability
If existing track roller designs with multiple components are used, then bearing function is achieved, but manufacturing complexity and part count increase
Solution Approach 1:
The patent combines the bearing surface and lubricant delivery function into a single integrated component. The solid lubricant coating is applied directly to the bearing surface of the track roller, merging what were previously separate systems (bearing structure and lubricant supply) into one unified component, thereby reducing part count and manufacturing complexity.
Solution Approach 2:
The invention removes intermediate components such as lubricant channels, ports, and seals by using a solid lubricant coating applied directly to the bearing surface. This extraction of unnecessary intermediate parts simplifies the overall assembly and reduces the total part count while maintaining bearing function.
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 solution provides a durable, reliable, and cost-effective track roller assembly with reduced maintenance needs, as it prevents lubricant leakage and minimizes wear, enhancing the stability and longevity of the assembly under extreme conditions.
Implementation Method 1
press fitting a first bushing to a first cylindrical bore of a first collar; press fitting a second bushing to a second cylindrical bore of a second collar
Data Source
AI summary
A track roller assembly for a track-type machine such as an excavator or a tractor includes an outer surface with no fluid ports and an inner surface free from any fluids. The track roller includes a shaft resting on self-lubricated bushings, which include a substrate that has lubricating properties, such as a substrate that carries a solid lubricant. The track roller assembly also includes a collar on either side of the shaft, with a retention pin passing through the shaft and connecting the two collars.