Axially Loaded Bearing with Independent Hydraulic and Spring Loading
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Solution Overview
Problem
Existing bearing systems in multi-powerplant aircraft struggle to maintain optimal load balance across varying power output conditions, particularly during idle cruise regimes where one engine operates at low power and the other at high power, leading to extra-marginal loads that can reduce component lifespan.
Innovation Solution
A bearing system with a loading system comprising an oil piston and a spring mechanism that provides compensatory and independent axial loads to maintain optimal load balance, using an oil piston for hydraulic load and a spring for passive load compensation, ensuring the load remains within a target range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bearings are designed for high power output conditions, then they can support axial loads under high power, but they generate extra-marginal loads during idle cruise regime that reduce component lifespan
Solution Approach 1:
The bearing system employs a dynamic loading mechanism that automatically adjusts the axial load applied to the bearing based on operating conditions. During high power output, the bearing receives full design load. During idle cruise regime, the loading mechanism reduces the applied load to match actual operational requirements, preventing extra-marginal loads and extending component lifespan while maintaining the bearing's inherent strength capability.
2Loss of energy
If one powerplant operates at lower power output during idle cruise, then overall energy consumption is reduced, but the bearing system experiences uneven load distribution
Solution Approach 1:
The system employs a counterbalancing loading mechanism that compensates for the uneven load distribution caused by differential powerplant operation during idle cruise. The mechanism applies compensatory axial loads to maintain balanced bearing loading even when one powerplant operates at lower power output, enabling energy-efficient operation while preserving load stability and preventing bearing damage from unbalanced forces.
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 system effectively maintains load balance across varying power conditions, reducing wear and extending component lifespan by damping vibrations and insulating components from excessive loads.
Implementation Method 1
a first axial loading structure (60) configured to impart a first axial load (L1) to the component of interest
Implementation Method 2
a second axial loading structure (70) arranged for imparting a second axial load (L2) to the component of interest
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A bearing system (20) for supporting a shaft (18), comprising: a bearing (30) including: an inner race (32b) about an axis (A), the inner race (32b) having an interior coupled to the shaft (18); rolling elements (34b) about the axis (A) and around the inner race (32b); and an outer race (38b) about the axis (A) and around the rolling elements (34b); a housing (50) having a cavity (52) defining an axial location (X) relative to the axis (A), the bearing (30) received by the cavity (52); a first axial loading structure (60) in the cavity (52) and operatively connected to the bearing (30); and a second axial loading structure (70) in the cavity (52) extending axially away from the axial location (X) in a first axial direction, the second loading structure (70) opposing movement of the bearing (30) relative to the axial location (X) in a second axial direction when the bearing (30) loads the second axial loading structure (70) in the second axial direction, the first and second axial loading structures operationally independent from one another.