Non-pneumatic Tire Spoke Segmentation for Vibration Control
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Solution Overview
Problem
Conventional non-pneumatic tires lack the shock-absorbing effect and handling ability required for high-speed vehicles due to non-uniform rigidity and noise issues caused by continuous spoke structures, limiting their application to general vehicles.
Innovation Solution
A non-pneumatic tire design featuring a band part with an inner and outer band separated by a distance, and a spoke part extending in a circumferential direction with holes in both axial and circumferential views, made of thermoplastic elastomer materials with specific tensile and flexural modulus ranges to enhance load support, vibration reduction, and noise dampening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a continuous spoke structure is used, then structural simplicity is achieved, but non-uniform rigidity causes vibration and noise
Solution Approach 1:
The continuous spoke structure is segmented into multiple sections along the circumferential direction. Each section is separated by gaps, creating a discontinuous structure that allows uniform rigidity distribution while maintaining structural simplicity. This segmentation eliminates the vibration and noise caused by non-uniform rigidity in continuous spokes.
Solution Approach 2:
Different sections of the spoke structure are designed with varying local properties including different rigidity values, cross-sectional areas, and material distributions. This local quality variation ensures uniform rigidity across the entire tire structure, reducing vibration and noise while maintaining overall structural integrity.
2Reliability
If non-pneumatic tire structure is used, then puncture resistance is improved, but shock-absorbing effect is reduced
Solution Approach 1:
The spoke structure is designed with dynamic characteristics that allow it to flex and absorb shock impacts. The segmented structure with varying rigidity enables the spokes to deform elastically under impact loads, providing shock-absorbing effect while maintaining puncture resistance through the overall structural integrity.
Solution Approach 2:
The rigidity parameters of the spoke sections are optimized to balance puncture resistance and shock absorption. By adjusting the cross-sectional area, material properties, and spacing of the segmented spokes, the structure achieves both high puncture resistance and effective shock-absorbing capability.
3Ease of manufacture
If uniform spoke rigidity is used, then manufacturing simplicity is maintained, but handling ability deteriorates
Solution Approach 1:
The spoke structure incorporates local quality variations with different rigidity values in different sections. This allows optimization of handling ability by placing higher rigidity sections where structural support is needed and lower rigidity sections where flexibility improves handling, while still maintaining relatively simple manufacturing processes.
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 tire achieves excellent driving performance, load-bearing ability, reduced vibration, and noise, while maintaining rigidity, making it suitable for various vehicle environments, including high-speed applications.
Implementation Method 1
made of thermoplastic elastomer materials with specific tensile and flexural modulus ranges to enhance load support, vibration reduction, and noise dampening
Data Source
AI summary
A non-pneumatic tire comprises: a band part including an inner band and an outer band, the outer band being separated from the inner band by a predetermined distance to surround the inner band; and a spoke part provided to extend in a circumferential direction of the tire between the inner band and the outer band, the spoke part including one or more holes when viewed in the circumferential direction and one or more holes when viewed in an axial direction of the tire.