Non-Pneumatic Tire Spoke Structure for Apex Deformation Limiting
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Solution Overview
Problem
Non-pneumatic tires face permanent deformation and damage due to excessive stress in the apex corner area of V-shaped spokes during high-impact events, leading to plastic deformation and reduced tire life.
Innovation Solution
Incorporating resistance parts, such as tile-like bodies or V-shaped bent plates with sliders, between the inclined plates of the spokes to limit deformation and prevent the included angle from decreasing beyond a preset value, thereby applying a reaction force to maintain elastic deformation and avoid plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spokes are designed with V-shape and arc-shaped apex corner area to concentrate deformation in the apex corner area, then the relationship between deformation amount and resistance becomes more constant, but the stress in the apex corner area exceeds the yield strength during great impact, causing plastic deformation
Solution Approach 1:
The resistance part acts as an intermediary element between the two inclined plates of the spoke. It includes a limiting portion that contacts the inclined plates to prevent excessive deformation of the apex corner area, and a buffering portion that provides additional resistance. This intermediary structure distributes the stress and prevents the apex corner area from exceeding its yield strength during impact events.
Solution Approach 2:
The resistance part is pre-installed in the spoke structure to proactively limit deformation before plastic deformation occurs. The limiting portion is positioned to contact the inclined plates at a predetermined deformation threshold, providing preliminary resistance that prevents the apex corner area from undergoing excessive deformation that would lead to plastic deformation.
2Loss of energy
If the apex corner area deforms excessively to cushion great impact, then the impact energy is absorbed, but the force arm increases and accelerates plastic deformation
Solution Approach 1:
The resistance part serves as a mediator that controls the deformation process. The buffering portion provides progressive resistance that allows controlled energy absorption while the limiting portion prevents excessive deformation. This ensures impact energy is absorbed through elastic deformation within safe limits, preventing the acceleration of plastic deformation that would occur with uncontrolled excessive deformation.
Solution Approach 2:
The resistance part changes the deformation parameters of the spoke by introducing a limiting deformation threshold. The limiting portion constrains the maximum deformation angle of the apex corner area, transforming the deformation behavior from uncontrolled plastic deformation to controlled elastic deformation within predetermined parameters, thereby extending tire service life while maintaining impact energy absorption capability.
3Loss of energy
If the included angle of the two inclined plates decreases during deformation, then the spoke absorbs impact energy, but the force arm increases and increases the speed of plastic deformation
Solution Approach 1:
The resistance part mediates the angle change process between the two inclined plates. The limiting portion maintains a minimum included angle by contacting the inclined plates, preventing the angle from decreasing too much. The buffering portion provides progressive resistance that allows controlled energy dissipation while maintaining the angle within safe limits, thereby controlling the deformation rate and preventing accelerated plastic deformation.
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 addition of resistance parts effectively prevents plastic deformation of the spokes, thereby extending the service life of non-pneumatic tires by ensuring that only elastic deformation occurs during impacts, maintaining tire integrity and performance.
Implementation Method 1
the spokes are buffered only by deforming the apex corner area (other areas do not deform)... the relationship between the radial deformation of the contact area of the tire and the resistance generated by the tire in this area closer to a definite functional relationship
Implementation Method 2
limiting the deformation amount of the apex corner area to a deformation amount corresponding to the yield strength... preventing the stress in the apex corner area to exceed the yield strength due to excessive deformation
Data Source
AI summary
The invention discloses a non-pneumatic tire, comprising a wheel hub; an annular belt located on the periphery of the wheel hub; spokes comprising a plurality of spokes circumferentially arranged between the annular belt and the wheel hub; each spoke being V-shaped, and the spoke comprising two inclined plates arranged at an angle and an arc-shaped apex corner area formed at the joint of the two inclined plates; a resistance part for limiting the deformation amount of the apex corner area to a deformation amount corresponding to the yield strength. According to the invention, plastic permanent deformation of spokes can be effectively avoided by adding resistance parts, and further the service life of non-pneumatic tires can be prolonged.