Self-aligning Bearing Unit for Agricultural Tillage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bearing assemblies in agricultural tillage applications face contamination and misalignment issues, leading to premature failure due to exposure to dirt, mud, and water, and requiring frequent relubrication, which is not feasible for maintenance-free units.
Innovation Solution
A self-aligning maintenance-free bearing unit with a multi-part sealing structure and integrated housing, featuring three lubrication zones and an anti-rotation system, which includes a spherical interface and protective shrouds to prevent contamination and misalignment, allowing for extended bearing life without relubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bearings are used in agricultural tillage environments, then they can perform tillage operations, but they are exposed to contaminants such as dirt, mud, and water leading to contamination and premature failure
Solution Approach 1:
The bearing assembly is divided into multiple sealed compartments including a bearing space separated from the external environment by seal structures. The housing is segmented into a bearing assembly housing and a separate contamination-resistant housing, creating physical barriers that prevent contaminant ingress while maintaining operational capability in harsh agricultural environments.
Solution Approach 2:
Seal structures including lip seals and sealing members are used to create flexible barriers between the bearing space and the external contaminated environment. These sealing elements conform to the sliding surfaces and prevent dirt, mud, and water from entering the bearing assembly while allowing the bearing to function in tillage applications.
2Reliability
If frequent relubrication is performed to sustain bearing life, then bearing assembly can be purged of contaminants, but maintenance time and environmental contamination from purged grease increase
Solution Approach 1:
The bearing assembly is designed with contamination-resistant seal structures that actively prevent contaminant ingress without requiring external maintenance intervention. The sealed design allows the bearing to sustain itself by excluding contaminants at the source, eliminating the need for frequent disassembly, relubrication, and purging operations that waste time and contaminate the environment.
Solution Approach 2:
The bearing space is pre-filled with lubricant and sealed before deployment in the field. The seal structures are installed beforehand to create a protective barrier that cushions the bearing from contaminant exposure throughout its operational life, preventing contamination accumulation that would otherwise require frequent maintenance purging.
3Adaptability or versatility
If bearing assembly allows dynamic misalignment to accommodate deflections, then it can handle tillage operations, but misalignment wear in key areas results in bearing damage after extended operation
Solution Approach 1:
A spherical interface is introduced between the bearing assembly housing and the contamination-resistant housing, allowing the bearing assembly to self-align and accommodate dynamic misalignment during tillage operations. This spherical connection geometry enables angular movement and deflection compensation without creating linear wear paths, maintaining bearing durability while providing the necessary adaptability for varying field conditions.
4Ease of operation
If high pressure washing is used to clean bearings, then contaminants can be removed, but contaminants are forced into the bearing space during cleaning
Solution Approach 1:
The bearing assembly is pre-sealed with robust seal structures before deployment, creating a contamination barrier that prevents dirt, mud, and water from entering during high-pressure washing operations. The seal structures are designed to withstand cleaning pressures while maintaining their sealing effectiveness, allowing the bearing to be cleaned externally without risking contaminant ingress into the protected bearing space.
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 extended bearing life, reduces maintenance costs, minimizes environmental contamination, and accommodates dynamic misalignment, ensuring reliable operation in harsh conditions without the need for frequent relubrication.
Implementation Method 1
The outer ring has a generally spherical outer surface... The self-aligning spherical interface... allows for dynamic misalignment to accommodate deflections encountered during the tillage operation
Implementation Method 2
The first sealing member is in sliding contact with the sliding surface of the other of the inner or outer rings... lubrication of the seal structures as well as creating a grease seal
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A contamination-resistant bearing assembly includes an outer ring mounted within a housing and an inner ring rotatably supported from the outer ring. Inboard and outboard seal structures are disposed within a bearing space defined between the rings and prevent contaminants from entering a rolling element lubrication zone. A surface seal may also be included to protect the spherical interface between the housing and outer ring. The improved structure allows dynamic alignment of the bearing assembly when acted on by outside forces and also allows for extended operation under maintenance free conditions with no need for relubrication.