Split Spherical Plain Bearing Half-Ring for Inward Grease Flow
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Solution Overview
Problem
Split metal/metal spherical plain bearings face lubrication issues due to grease flowing out via the split interface between half-rings, leading to pressure loss and inadequate lubrication of the bore zone.
Innovation Solution
The inner half-ring design features radial central grooves, cutouts, and channels on both the outer and inner surfaces to direct grease flow inwardly, enhancing lubrication by creating pathways for grease to reach the bore zone effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner ring is split into two half-rings, then the bearing can be assembled onto the shaft, but grease flows out via the split interface causing pressure loss and inadequate lubrication
Solution Approach 1:
The inner ring is divided into two half-rings that can be separately assembled onto the shaft, maintaining the assemblability benefit while introducing grooves and sealing features to control grease flow and prevent leakage through the split interface
Solution Approach 2:
A sealing element or groove structure acts as an intermediary at the split interface between half-rings, directing grease flow inward toward the bore zone while preventing outward leakage, thus resolving the contradiction between assemblability and lubrication effectiveness
2Reliability
If PTFE inserts are added to fill the gap between half-rings, then grease flow is improved, but manufacturing cost increases and inserts may detach
Solution Approach 1:
The PTFE material function is extracted and integrated directly into the half-ring structure through grooves or molded features, eliminating the need for separate inserts while maintaining grease flow control and reducing manufacturing complexity
Solution Approach 2:
The half-ring structure combines metal with integrated PTFE features or coatings, creating a composite structure that provides both structural integrity and grease flow management without requiring separate insert components
Data Source
AI summary
An inner half-ring of a spherical plain bearing has a spherical outer surface, a cylindrical inner surface, and a first flat front face and a second flat front face delimiting the half-ring in a circumferential direction. The first and second flat front faces extend between the outer surface and the inner surface, and a first central groove is formed in the first front face and extends between the outer surface and the inner surface.