Roller Collar Design for Carrier Roller Seal Protection
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Solution Overview
Problem
Track-type machines experience increased wear and lubricant loss due to abrasive material accumulation in the seal cavities of carrier rollers, leading to premature failure, especially in environments with debris and abrasive materials.
Innovation Solution
The implementation of a roller assembly with an annular seal and collar configuration that creates a seal cavity in fluid communication with the ambient atmosphere, featuring decreasing diameters and additional design elements such as flanges and teeth to impede the accumulation of abrasive material, thereby protecting the seals from compaction and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seal cavity is left open to ambient atmosphere, then the seal can be accessed for installation and maintenance, but abrasive material accumulates in the cavity causing seal displacement and abrasion
Solution Approach 1:
The collar is divided into multiple functional surfaces with decreasing diameters, creating segmented zones that progressively impede material flow toward the seal cavity while maintaining accessibility
Solution Approach 2:
The collar acts as an intermediary element between the ambient environment and the seal cavity, filtering and impeding abrasive material through its decreasing diameter surfaces while allowing controlled access to the seal
2Object-affected harmful factors
If the seal cavity is sealed off completely, then abrasive material accumulation is prevented, but seal installation and maintenance become difficult
Solution Approach 1:
Different portions of the collar have different diameters, creating localized zones with varying degrees of material impedement, allowing the seal cavity to be partially protected while maintaining access pathways
Solution Approach 2:
The collar's decreasing diameter configuration creates a dynamic flow path that adapts to material size, allowing smaller particles to pass while impeding larger abrasive materials, and maintaining flexible access for maintenance operations
3Productivity
If the roller operates in abrasive environments, then productivity is maintained, but wear and lubricant loss increase due to seal failure
Solution Approach 1:
The collar's decreasing diameter surfaces create preliminary resistance to abrasive material flow before the material can reach and damage the seal, preventing seal failure before it occurs
Solution Approach 2:
The collar structure provides beforehand protection to the seal against abrasive material, cushioning the seal from direct exposure to harmful particles and extending its service life
Data Source
AI summary
A roller collar is provided in a roller assembly of a machine, such as a track carrier roller of a track-type undercarriage. The roller assembly includes a roller mounted on a shaft and having a seal retaining lubricant between the roller and the shaft. The collar and an inner surface of the roller form a seal cavity placing the seal in fluid communication with an ambient atmosphere surrounding the roller. The roller collar extends over an opening into the seal cavity, such as with an outwardly extending flange or teeth or with an outer surface configured to increase a distance to be traveled to enter the seal cavity, and to reduce the amount of abrasive material entering the seal cavity and potentially compromising the integrity of the seal.