Seal Assembly Axial Thrust Load Management Track Joint
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Solution Overview
Problem
Track-type machines experience excessive endplay and 'pin walking' issues due to loose or disconnected track sections, leading to significant productivity losses, as existing seal assemblies fail to effectively withstand axial thrust loads and prevent contaminants from entering the track joints.
Innovation Solution
A seal assembly comprising a seal member and a thrust ring, with a frusto-conical inner relief surface and an outer relief surface, is designed to be mounted on a track pin, allowing for axial movement while preventing over-strain during assembly and operation, and is made using simplified tooling for increased production yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing seal assemblies are used in track joints, then they can provide basic sealing function, but they fail to withstand axial thrust loads and prevent contaminants from entering
Solution Approach 1:
The seal member is divided into multiple functional surfaces: a first engagement surface for sealing against the bushing, a second engagement surface for sealing against the link, a frustoconical relief surface for load distribution, and an outer relief surface. This segmentation allows each surface to perform its specific function optimally, with the relief surfaces specifically designed to handle axial thrust loads and prevent contaminant intrusion.
Solution Approach 2:
The frustoconical inner relief surface introduces a conical geometry dimension to the seal member, allowing it to withstand axial thrust loads by distributing forces across the conical surface. This dimensional change from simple planar sealing surfaces to a three-dimensional frustoconical structure enables the seal to handle complex load conditions while maintaining sealing effectiveness.
2Ease of manufacture
If simplified tooling is used for seal assembly production, then manufacturing complexity is reduced, but production precision may be affected
Solution Approach 1:
The seal member is designed with pre-formed frustoconical relief surfaces and precise engagement surfaces that are built-in during molding. This preliminary formation of critical surfaces during the molding process, rather than requiring post-manufacturing machining or adjustment, allows simplified tooling to produce seals with the necessary precision for withstanding axial thrust loads and maintaining effective sealing.
Data Source
AI summary
A seal assembly can be incorporated into a track joint assembly of an undercarriage of a track-type machine. The track joint can have a first member pivotable about a rotational axis relative to a second member thereof. The first member includes a seal member engagement surface defining, at least in part, an axially-extending seal cavity about the rotational axis and within which the seal assembly is disposed. The seal assembly can include a thrust ring and a seal member mounted to the thrust ring. The seal member includes a first member engagement surface, a second member engagement surface, a frusto-conical inner relief surface, a thrust ring engagement surface, and an outer relief surface.