Aircraft Tire Tread Protection Layer Cord Segmentation
Solution Overview
Problem
Aircraft pneumatic tires face challenges in maintaining cut resistance and durability due to the stretching of tread protection layer cords when internal pressure increases, leading to potential cord interference and separation.
Innovation Solution
Incorporating cord discontinuity portions along the tire circumferential direction in a wave-shaped tread protection layer, with narrower intervals between these discontinuities in the wide-width rib regions, to prevent cord interference and enhance elongation capacity while maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the amplitude of cords in the tread protection layer is increased to provide more room for elongation, then the elongation capacity is improved, but adjacent cords may interfere with each other causing separation and reduced durability
Solution Approach 1:
The cords in the tread protection layer are segmented into multiple sections along the tire circumferential direction, with cord discontinuity portions created at specific locations. This segmentation prevents continuous cord interference while maintaining elongation capacity in each cord section, thereby resolving the contradiction between elongation room and durability.
Solution Approach 2:
Cord discontinuity portions are strategically positioned at locations where cords are most likely to interfere with adjacent cords. By applying discontinuities only at these critical locations rather than uniformly throughout, the design maintains cord continuity where needed while preventing interference where amplitude increases would cause problems.
2Adaptability or versatility
If the amplitude of cords is increased to accommodate large diametric length increase during internal pressure charging, then the elongation capacity is improved, but cord interference between adjacent cords occurs
Solution Approach 1:
The cords are divided into discrete sections with gaps (cord discontinuity portions) at strategic locations. This segmentation allows each cord section to accommodate amplitude increases during internal pressure charging without continuous contact with adjacent cords, enabling large elongation capacity while preventing harmful cord interference.
Solution Approach 2:
Cord discontinuity portions are pre-positioned at locations where cord interference would occur during inflation. This preliminary structural arrangement anticipates the amplitude increase that occurs during internal pressure charging and prevents cord interference before it can occur, allowing the tire to accommodate pressure changes effectively.
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
This design effectively increases the room for elongation of the tread protection layer, suppressing cord interference and ensuring durability, even with large amplitude waves, by strategically positioning cord discontinuities at inflection points and varying intervals between them.
Implementation Method 1
each of the cords is formed in a wave shape with an amplitude in the tire width direction, thereby securing room for elongation in advance
Implementation Method 2
there are cord discontinuity portions provided in the cords of the tread protection layer, and so interference is not liable to occur between adjacent cords even if the amplitude of the cord is large in the tire width direction
Data Source
AI summary
An object of the invention is to increase the room for elongation of a tread protection layer, while securing durability.An aircraft pneumatic tire 10 includes: a tread protection layer (12) that is provided at a lower layer of a tread section (22), and that includes plural cords (24) that arrayed in a tire width direction and are each disposed along a wave shaped imaginary line extending along a tire circumferential direction with the tire width direction as the amplitude direction; and cord discontinuity portions (14) where locations of close proximity of the cords (24) to each other are partially omitted in the tread protection layer (12).