Thrust Bearing Cage Axial Flange for Shaft Piloting
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Solution Overview
Problem
Conventional axial roller bearings require piloting features on only one shaft to maintain concentric positioning, which can lead to increased part complexity and vulnerability to damage under impact loads when both shafts do not have piloting features, and may not efficiently manage lubricant flow.
Innovation Solution
A bearing design featuring a cage with an axial extension that extends beyond the rollers, allowing for lubricant flow and radial positioning without the need for piloting features on both shafts, reducing part complexity and enhancing robustness under impact loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If piloting features are added to both shafts to improve concentric positioning, then positioning accuracy is improved, but part complexity and vulnerability to damage increase
Solution Approach 1:
The piloting function is extracted from the shafts and transferred to the cage component. The cage includes an axial extension with a piloting surface that contacts the shaft, eliminating the need for piloting features on the shafts themselves. This reduces shaft complexity while maintaining positioning accuracy.
Solution Approach 2:
The cage acts as an intermediary component that provides the piloting function. Instead of requiring direct piloting features on both shafts, the cage mediates the positioning by contacting one shaft with its axial extension and maintaining concentric alignment without requiring shaft modifications.
2Reliability
If washers are added to protect against impact loads, then reliability under impact is improved, but device complexity and assembly cost increase
Solution Approach 1:
The protective function previously requiring separate washers is merged into the cage structure itself. The cage's axial extension and robust design provide both the piloting function and impact load protection, eliminating the need for separate washer components.
Solution Approach 2:
The cage is designed to perform multiple functions: it retains rollers, provides concentric positioning through its axial extension with piloting surface, and protects against impact loads. This multi-functionality eliminates the need for separate dedicated components for each function.
3Ease of manufacture
If conventional cage design is used, then manufacturing is simpler, but lubricant flow management is inefficient
Solution Approach 1:
The cage incorporates holes through its axial extension, creating a porous-like structure that allows lubricant to flow through the cage body. This improves lubricant distribution to the bearing surfaces while maintaining manufacturing simplicity by adding holes to an existing cage design.
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 design reduces the number of distinct parts, lowers assembly costs, and provides improved robustness against impact thrust loads while allowing for efficient lubricant management.
Implementation Method 1
The axial extension may define at least one hole to permit flow of lubricant
Data Source
AI summary
A thrust bearing cage includes a piloting feature to radially locate a thrust bearing with respect to one of the shafts. Specifically, the bearing cage includes an axial extension at an outer diameter that extends beyond the rollers and around an outer diameter of end of the shaft. This feature permits elimination of a washer.