Self-Lubricating Bearing Liners for Turbine Engine Hinges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bell crank assemblies in turbine engine nozzle assemblies face frequent maintenance and replacement due to inadequate lubrication of ball bearings under high temperature and vibration conditions, leading to increased operational costs.
Innovation Solution
A self-lubricating bearing assembly comprising a sleeve, bushings, liners, a thrust washer, and a nut, where the liners are made of woven fluorocarbon-based polymer fabric material, such as PTFE, providing hard and smooth surfaces to reduce friction and wear, and absorb vibrations and high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ball bearings are used in the bell crank assembly, then friction is reduced and wear is minimized under normal conditions, but the ball bearings cannot be sufficiently lubricated under high temperature and high vibration conditions, leading to frequent maintenance and replacement
Solution Approach 1:
The bearing assembly incorporates self-lubricating liners made of woven fluorocarbon-based polymer fabric material that provide continuous lubrication without external intervention. The liners are impregnated with lubricant that is released gradually during operation, enabling the bearing to service itself and eliminate the need for frequent maintenance and replacement under high temperature and vibration conditions.
Solution Approach 2:
The invention uses composite construction combining metal bushings with woven fluorocarbon-based polymer fabric liners. This composite material structure provides both the structural integrity of metal and the self-lubricating properties of the polymer fabric, creating a bearing surface that maintains reliability under extreme operating conditions while reducing maintenance requirements.
2Productivity
If ball bearings are installed in the bell crank assembly to reduce friction, then performance is improved under normal conditions, but the bearings require frequent maintenance and replacement due to inadequate lubrication in the high temperature environment
Solution Approach 1:
The self-lubricating liners provide continuous automatic lubrication throughout the bearing's operational life, ensuring consistent friction reduction and wear protection without requiring external maintenance. This self-servicing mechanism maintains high productivity while extending bearing life cycle under high temperature and vibration conditions.
Solution Approach 2:
The invention changes the lubrication parameter from intermittent external lubrication to continuous internal lubrication through the self-lubricating liner material. This parameter change ensures adequate lubrication under high temperature conditions, extending bearing life while maintaining operational efficiency and productivity.
3Device complexity
If conventional ball bearings are used without adequate lubrication under high temperature conditions, then the assembly structure remains simple, but friction increases and wear accelerates, requiring frequent maintenance
Solution Approach 1:
The bearing assembly uses a composite structure with metal bushings and woven fluorocarbon-based polymer fabric liners. This composite design provides enhanced wear resistance and self-lubricating properties while maintaining relatively simple assembly structure. The liners are pressed into the bushings, creating a reliable bearing surface that resists wear under high temperature and vibration without significantly increasing structural complexity.
Solution Approach 2:
The self-lubricating liners are applied specifically to the bearing surface areas that experience friction and wear. This local quality enhancement provides targeted wear protection and lubrication where needed most, maintaining overall assembly simplicity while significantly improving wear resistance and reliability at the critical bearing interfaces.
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 self-lubricating bearing assembly enhances reliability and performance without increasing weight or cost, maintaining equivalent weight to conventional assemblies while improving wear life and reducing maintenance needs.
Implementation Method 1
the liners are made of woven fluorocarbon-based polymer fabric material, such as PTFE, providing hard and smooth surfaces to reduce friction and wear
Implementation Method 2
absorb vibrations and high temperatures
Implementation Method 3
absorb vibrations and high temperatures
Data Source
AI summary
A self-lubricating bearing assembly for a hinge of a turbine engine nozzle is described. The hinge includes a bolt and a bell crank housing. The bearing assembly includes a sleeve, a pair of bushings, liners, a thrust washer and a nut. The sleeve includes a tubular and a shoulder portion. Each bushing has an inner and an outer diameter. The liners include first liners, each bonded to the inner diameter of a respective one of the bushings, a second liner disposed between the shoulder portion and a bushing, and a third liner disposed between the thrust washer and a bushing. When assembled, the tubular portion is disposed over an outer diameter of the bolt, the outer diameters of the bushings are disposed within an inner diameter of the bell crank housing, and the nut is affixed between the thrust washer and the bolt to secure the hinge assembly.