Non-Pneumatic Tire Bump Stop Structure Against Plastic Deformation
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Solution Overview
Problem
Non-pneumatic tires experience plastic deformation when subjected to extreme loading, such as encountering potholes or debris, which can render them inoperable, and existing bump stops present manufacturing challenges, particularly when located centrally along the axial direction.
Innovation Solution
The non-pneumatic tire incorporates bump stops with inner and outer members extending from the annular inner and outer rings, respectively, featuring compliant ends that elastically deform to prevent plastic deformation of the tire components by limiting loads beyond the elastic limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bump stops are located substantially centrally along the axial direction, then plastic deformation is prevented, but manufacturing challenges increase
Solution Approach 1:
The bump stop is divided into two separate members: an inner member extending from the inner ring and an outer member extending from the outer ring. These segmented members are manufactured and positioned separately, simplifying the manufacturing process while maintaining the central location needed to prevent plastic deformation of tire components.
Solution Approach 2:
The bump stop members act as intermediary elements positioned between the inner and outer rings. These intermediaries limit the deflection distance between the rings when encountering bumps, preventing extreme loading without requiring complex centralized manufacturing.
2Force
If the tire encounters extreme loading from bumps, then plastic deformation occurs, but tire functionality is compromised
Solution Approach 1:
The bump stop members are pre-positioned between the inner and outer rings to provide cushioning before extreme loading occurs. When the tire encounters bumps, these members limit deflection and absorb energy, preventing the extreme loading that would cause plastic deformation and maintain tire operability.
Solution Approach 2:
The bump stop members change the deflection parameter of the tire structure by limiting the maximum distance the inner and outer rings can move apart. This parameter change ensures that loading remains within the elastic range of tire materials, preventing plastic deformation while maintaining load bearing capacity.
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 bump stops effectively restrict deformation, maintaining tire functionality by keeping stresses within the elastic limit, thereby preventing damage and ensuring the tire remains operational.
Implementation Method 1
featuring compliant ends that elastically deform to prevent plastic deformation of the tire components by limiting loads beyond the elastic limit
Data Source
Figure 1~2
Figure 3
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AI summary
A non-pneumatic tire includes an annular inner ring, an annular outer ring, and a support structure extending from the annular inner ring to the annular outer ring. The support structure includes a plurality of spokes, webbing, cells, or other open-sided support structure. The tire includes a bump stop. The bump stop includes an inner member radially extending from a radially outer surface of the annular inner ring. The inner member has a radially outer surface facing a radially inner surface of the annular outer ring. The bump stop includes an outer member radially extending from a radially inner surface of the annular outer ring. The outer member has a radially inner surface facing a radially outer surface of the annular inner ring.