Bearing Oil Distributor Ring Locking Against Nut Unscrewing
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Solution Overview
Problem
In aircraft turbomachines, existing oil distribution systems for rolling bearings face challenges in ensuring the immobilization of components relative to each other within the restricted environment, particularly in preventing accidental unscrewing and loosening of the nut, while maintaining effective lubrication and cooling.
Innovation Solution
An oil distribution device with a nut screwed onto the distribution ring to tighten the internal ring axially, utilizing the dynamic seal track for rotation blocking, thereby ensuring immobilization without adding extra parts, optimizing cost, mass, and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a nut is screwed onto the distribution ring to tighten the internal ring axially, then the axial immobilization of the bearing is improved, but the risk of accidental unscrewing and loosening increases
Solution Approach 1:
The dynamic seal track serves as an intermediary element that provides rotation blocking features (teeth or protrusions) to prevent unscrewing of the nut. This mediator component transforms the simple nut into a secured fastening system without requiring a completely different fastening mechanism.
Solution Approach 2:
The dynamic seal track is designed to perform multiple functions: it provides the sealing function for the oil chamber and simultaneously provides rotation blocking features to prevent nut loosening. This multi-functionality eliminates the need for separate anti-loosening components.
2Reliability
If rotation locking elements are added to prevent nut loosening, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The dynamic seal track is designed to perform multiple functions: it provides the sealing function for the oil chamber and simultaneously provides rotation blocking features to prevent nut loosening. This multi-functionality eliminates the need for separate anti-loosening components.
Solution Approach 2:
The rotation blocking features are merged into the existing dynamic seal track structure. The teeth or protrusions are integrated into the seal track's design, combining the sealing and anti-loosening functions into a single component rather than using separate elements.
3Reliability
If additional parts are added for rotation locking, then the reliability is improved, but the overall mass and axial size increase
Solution Approach 1:
The dynamic seal track is designed to perform multiple functions: it provides the sealing function for the oil chamber and simultaneously provides rotation blocking features to prevent nut loosening. This multi-functionality eliminates the need for separate anti-loosening components.
Solution Approach 2:
The existing dynamic seal track structure is utilized to provide the rotation blocking function. The seal track's own geometry (teeth or protrusions) serves the dual purpose of sealing and preventing nut loosening, making the system self-sufficient without external additions.
4Reliability
If the nut is locked in rotation by the dynamic seal track, then the reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The rotation blocking function is achieved through discrete teeth or protrusions on the dynamic seal track that engage with corresponding features on the nut. This segmentation approach provides defined engagement points that are easier to manufacture with standard tolerances compared to continuous engagement surfaces.
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 effectively immobilizes the nut and internal ring, preventing accidental unscrewing while maintaining efficient lubrication and cooling, thus enhancing the mechanical integrity and operational reliability of the turbomachine's rolling bearings.
Implementation Method 1
a nut screwed onto a thread of the distribution ring and bearing axially on a second axial end of the internal ring to tighten it axially against said shoulder
Implementation Method 2
said annular track is configured to bear axially on said distribution ring and comprises rotation locking elements cooperating with complementary elements of the nut
Implementation Method 3
said annular track is configured to bear axially on said distribution ring
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Device for distributing oil from a rolling bearing (8) for an aircraft turbine engine, comprising: - a rolling bearing (8), - an oil distributor ring (5) and - an annular track (26) of a dynamic seal (22), characterised in that it further comprises a nut (16) screwed on to a thread (5d) of the distributor ring and bearing axially against an axial end of the inner ring so as to clamp it axially, and in that the annular track is configured to bear axially against the distributor ring and comprises rotating locking elements (27) engaging with the additional elements (28) of the nut.