Pneumatic Tire Transverse Grooves S-Shape Flanks
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Solution Overview
Problem
Existing pneumatic vehicle tire designs with transverse grooves often produce unfavorable tire/road noise due to stepped embankment flanks, which also hinder effective water drainage and rigidity.
Innovation Solution
The embankment flanks of the transverse grooves are designed to run in a flat S-shape with rounded transitions to the tread periphery and groove base, forming an angle of inclination between 50° and 70°, eliminating edges that contribute to noise and enhancing water drainage by preventing turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stepped embankment flanks with edges are used in transverse grooves, then the groove structure is simple to manufacture, but tire/road noise increases unfavorably
Solution Approach 1:
The embankment flanks are designed with rounded transitions instead of sharp edges, featuring a convex curvature in cross-section. This curvature eliminates the stepped edges that cause noise while maintaining manufacturability through standard molding techniques.
Solution Approach 2:
The embankment flank geometry is changed from a stepped profile to a continuous S-shaped profile with specific curvature parameters. The rounding radius and angle of inclination are optimized to balance noise reduction with water drainage performance.
2Object-generated harmful factors
If embankment flanks with convex curvature are used, then tire/road noise is reduced, but water drainage capacity may be compromised
Solution Approach 1:
The angle of inclination of the middle section is optimized to between 50° and 70° relative to the radial direction. This specific angular range ensures that water flows smoothly along the curved surface without turbulence, maintaining high drainage capacity while eliminating noise-causing edges.
Solution Approach 2:
The continuous S-shaped curvature with rounded transitions creates a smooth flow path for water, preventing turbulence and eddies that would occur with sharp edges, thereby maintaining efficient water drainage while reducing noise.
3Object-generated harmful factors
If rounded transition sections are added to embankment flanks, then tire/road noise is reduced, but profile element rigidity may be reduced
Solution Approach 1:
The rounding radius of the transition sections is carefully controlled within a specific range. This optimized radius provides sufficient rounding to eliminate noise-causing edges while maintaining enough structural thickness to preserve the rigidity of the profile elements.
Solution Approach 2:
The S-shaped curved profile distributes stress more evenly compared to sharp corners, and the controlled rounding radius ensures that the transition sections provide both noise reduction and adequate structural strength for the profile elements.
4Productivity
If transverse grooves extend to the middle area of the tread, then water drainage from the central area is improved, but the grooves may interfere with ground contact
Solution Approach 1:
The transverse grooves are strategically positioned and sized to provide effective water drainage from the central tread area while maintaining sufficient rubber material between the groove edges and the ground contact patch to ensure reliable traction and ground contact.
Data Source
Figure 1~2
AI summary
The pneumatic vehicle tire comprises a tread which comprises profile blocks or block-like profile elements that are formed by a circumferential groove (2) or sections. A running transverse groove (4) is formed in an axial direction in the profile blocks or block-like profile elements. An inclination angle is provided as 50 degree or 70 degree.