Tire Sealing Layer Junction Angles for Low Rolling Noise
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Solution Overview
Problem
Existing tire designs suffer from noise generation due to the radial overlap junctions in the sealing layer, which are inefficient to manufacture and result in discomfort, particularly noise emission during rolling.
Innovation Solution
The tire design incorporates a sealing layer with a junction angle ranging from 20° to 60° in the axial portion aligned with the working layer and greater than 90° in the sidewall portion, reducing the circumferential length of the junction and minimizing noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the junction is formed with a constant angle of substantially 90° with the circumferential direction, then the sealing layer effectively seals against inflation gas, but the junction generates vibrations and noise during tire rolling
Solution Approach 1:
The patent applies different junction angles in different axial regions of the sealing layer. In the crown region (axial width corresponding to at least 40% of the working layer), the junction forms an angle of 20°-60° with the circumferential direction to reduce noise. In the sidewall region, the junction forms an angle greater than 90° to maintain sealing effectiveness. This local differentiation resolves the contradiction between noise reduction and sealing reliability.
2Object-affected harmful factors
If the junction angle is reduced to less than 90° to reduce noise, then the circumferential length of the junction increases, but this complicates the manufacturing process and increases the risk of adhesion during crosslinking
Solution Approach 1:
The patent limits the reduced angle (20°-60°) to a specific axial region corresponding to at least 40% of the working layer axial width, while maintaining the greater than 90° angle in the sidewall region. This localized application reduces the circumferential length of the junction only where necessary for noise reduction, rather than extending it across the entire sealing layer, thus controlling manufacturing complexity.
3Object-affected harmful factors
If the junction circumferential length is increased to reduce noise through a smaller angle, then the masking means required to prevent anti-adhesive composition penetration must also be increased in length, increasing manufacturing complexity
Solution Approach 1:
By confining the reduced junction angle (20°-60°) to a specific axial region rather than applying it across the entire sealing layer, the patent minimizes the circumferential length of the junction that requires masking. This localized approach reduces the length of masking means needed compared to a uniform small-angle design, thereby reducing manufacturing complexity while still achieving noise reduction in the critical crown region.
Data Source
AI summary
A tire comprises a sealing layer comprising a junction (21) extending in a main direction (D4) forming, with the circumferential direction (Z) of the tire: in a portion (15S) of the sealing layer extending axially in radial line with the working layer, an angle (ES) ranging, in absolute value, from 20° to 60°, and in a portion (15F) of the sealing layer extending radially in each sidewall, an angle (EF), in absolute value, strictly greater than the angle (ES) of the main direction (D4) of the junction (21) in the portion (15S) of the sealing layer extending axially in radial line with the working layer.