Chamfered Shoulder Non-Pneumatic Tire Curb Impact Protection
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Solution Overview
Problem
Non-pneumatic tires suffer damage to the tread member when colliding with curbs due to compressive stress.
Innovation Solution
The outer cylinder's shoulder section is chamfered, and the tread member is designed with protective sections that allow inward swelling, minimizing compressive stress and damage when the tire collides with a curb.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tread member covers the side sections of the outer cylinder, then damage to the outer cylinder is prevented, but damage to the tread member occurs when colliding with a curb
Solution Approach 1:
The tread member is divided into a tread portion and a protective section. The protective section specifically covers the side sections of the outer cylinder, while the tread portion contacts the ground. This segmentation allows different parts of the tread member to have specialized functions, with the protective section designed to absorb collision impacts.
Solution Approach 2:
The protective section is positioned specifically at the side sections where curb collisions occur, rather than uniformly distributing material throughout the tread member. This local concentration of protective material optimizes the balance between protecting the outer cylinder and maintaining tread member durability under collision conditions.
2Reliability
If the shoulder section is chamfered and protective sections are added, then tread member damage is minimized, but device complexity increases
Solution Approach 1:
The protective section is integrated with the tread portion to form a single tread member component. This merging approach allows the tread member to simultaneously provide ground contact functionality and collision protection, reducing the need for separate protective components and simplifying the overall structure.
Solution Approach 2:
The shoulder section of the outer cylinder is chamfered at an angle of 45 degrees or more, creating a curved transition surface. This curvature design allows the protective section to swell inward more effectively during collisions, distributing stress and reducing damage while maintaining a relatively simple geometric form.
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 reduces tread member damage and maintains riding comfort and ground contact area, even at increased camber angles.
Implementation Method 1
linking members (3) configured to link the inner cylinder (6) to the outer cylinder (4) so that they are elastically displaceable
Implementation Method 2
the tread member is designed with protective sections that allow inward swelling, minimizing compressive stress and damage when the tire collides with a curb
Data Source
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AI summary
In the present invention, a non-pneumatic tire (1) includes an inner cylinder attachable to an axle shaft, an outer cylinder (4) configured to surround the inner cylinder from the outside in a tire radial direction, a linking member (3) configured to link the inner cylinder to the outer cylinder (4), and a tread member (5) externally fitted onto the outer cylinder (4). The outer cylinder (4) includes an outer circumferential section (41) positioned on a tire equatorial line, side sections (42) positioned on both sides in a tire width direction with respect to the outer circumferential section (41), and a shoulder section (43) configured to connect the outer circumferential section (41) to the side sections (42). The tread member (5) covers the outer circumferential section (41), the side sections (42), and the shoulder section (43), and the shoulder section (43) is chamfered.