Aircraft Disc Brake Retaining Ring Vibration Control
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Solution Overview
Problem
Aircraft disc braking systems experience premature wear and vibrations due to pulsating forces and oscillations between the brake disc and rim, leading to fatigue stresses and audible vibrations, which reduce the system's service life.
Innovation Solution
A braking system with a retaining ring that allows relative movement between the brake disc and rim while transmitting braking loads, reducing contact risks and facilitating machining, and featuring elastically deformable retaining rings to absorb axial displacements and angular deviations, thereby optimizing the system's life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake disc is rigidly fixed to the rim, then the braking force transmission is efficient, but the pulsating forces cause vibrations and premature wear
Solution Approach 1:
The brake disc is designed with teeth that can move axially within notches in the rim, transforming the rigid connection into a dynamic one. This allows the teeth to self-adjust their position during braking, absorbing pulsating forces and eliminating vibrations while maintaining effective braking force transmission through the elastic deformation of the retaining ring.
Solution Approach 2:
The system changes the physical state of the connection between brake disc and rim from rigid to elastic. The retaining ring is designed to deform elastically under braking loads, allowing controlled movement of the brake disc teeth relative to the rim notches. This parameter change enables the system to absorb shock and vibration while maintaining structural integrity.
2Object-generated harmful factors
If the brake disc is allowed to move freely within the rim, then vibrations are reduced, but the braking force transmission becomes inefficient
Solution Approach 1:
The retaining ring acts as a flexible element that connects the brake disc teeth to the rim notches. It provides controlled flexibility, allowing the brake disc to move enough to eliminate vibrations but restraining it sufficiently to maintain effective braking force transmission. The elastic deformation of the retaining ring ensures power transmission while accommodating positional adjustments.
3Productivity
If the brake disc and rim are tightly connected, then the braking efficiency is high, but the wear and fatigue stresses increase
Solution Approach 1:
The elastic retaining ring provides beforehand cushioning by absorbing shock loads and pulsating forces before they can cause damage to the brake disc or rim. The notches in the rim and the movable teeth design create a cushioning mechanism that protects the mating surfaces from high-stress contact, reducing wear while maintaining braking efficiency.
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 reduces the risk of interference between brake components, minimizes vibrations, and extends the service life of the braking system by allowing controlled movement and deformation of the retaining ring, thus reducing wear and fatigue stresses.
Implementation Method 1
a retaining ring (60), this retaining ring being elastically deformable parallel to said axial direction to give each first tooth freedom of movement in a notch
Data Source
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AI summary
The present invention relates to a braking system (10) equipped with a brake disc (40) and a rim (20). Said brake disc (40) comprises a plurality of first teeth (42), each positioned in a notch (29) of the rim. To optimize its service life, said braking system (10) includes a retaining ring (60), said retaining ring (60) being fixed to each end face (26) and to each rear face (45), a circumferential gap (80) separating each first tooth (42) from two second teeth (25) between which the first tooth (42) is circumferentially arranged.