Tread Reinforcing Net Structure for Stable Tire Tape Winding
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Solution Overview
Problem
Existing pneumatic tires face challenges in maintaining the bonding strength between reinforcing cords and the underlying structure while preventing disturbances or disorders in the windings of the tape, particularly during cornering performance improvements.
Innovation Solution
A pneumatic tire design featuring a tread reinforcing layer with a net structure formed from a tape of topping rubber, where reinforcing cords are embedded, with specific oblique and circumferential segments that intersect, reducing bending stress and preventing tape winding disturbances by maintaining high bonding strength and minimizing contact between segment edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If parallel segments are added to connect oblique segments in the tread reinforcing layer, then bonding strength between reinforcing cords and underlying structure is maintained at high level, but the tape structure becomes more complex and windings may be disturbed
Solution Approach 1:
The tread reinforcing layer is divided into multiple oblique segments arranged in a net structure pattern, where each segment is inclined at specific angles (e.g., 30-60 degrees) to the tire equatorial plane. This segmentation allows the structure to maintain strength while reducing complexity compared to continuous parallel segments, as each segment can be independently optimized for bonding performance.
Solution Approach 2:
The patent transitions from a two-dimensional arrangement (parallel segments in one direction) to a three-dimensional net structure with segments inclined at various angles in multiple directions. This dimensional change creates a more efficient load distribution network that maintains bonding strength without requiring excessive material or complex flat patterns.
2Ease of operation
If oblique segments are used in the tread reinforcing layer, then cornering performance is improved, but tape windings may become disturbed or disordered
Solution Approach 1:
Different regions of the tread reinforcing layer are assigned different segment configurations - oblique segments with specific inclinations (e.g., 30-60 degrees) are placed in shoulder regions to enhance cornering performance, while more stable patterns are used in the central tread region to maintain winding stability. This local differentiation allows simultaneous optimization of cornering and winding reliability.
Solution Approach 2:
The tread reinforcing layer combines multiple tape materials with different properties (e.g., steel cords, organic fiber cords, or aramid cords) arranged in oblique segments within a rubber matrix. This composite structure provides both the mechanical performance needed for cornering and the structural stability to prevent winding disturbance, as different materials contribute different characteristics to the overall system.
3Strength
If the angle of tape with respect to tire circumferential direction is decreased in axial outer parts, then bonding strength is maintained, but the net structure becomes more complex
Solution Approach 1:
The tape angle configuration is made dynamic rather than static - the angle of oblique segments varies continuously or stepwise along the axial direction, with angles decreasing in axial outer parts to maintain bonding strength. This dynamic angle variation allows the structure to adapt to different stress conditions at different locations without requiring a completely complex fixed geometric pattern.
Solution Approach 2:
The patent systematically varies key parameters of the net structure, particularly the inclination angle of oblique segments, along the axial direction. By changing the angle parameter from constant to variable (decreasing toward axial outer parts), the design maintains bonding strength in critical regions while simplifying the overall structure compared to maintaining uniform high angles throughout.
Data Source
AI summary
A pneumatic tire has a tread reinforcing layer comprising a net structure formed from a tape of rubber coated reinforcing cord(s). The net structure comprises first oblique segments and second oblique segments of the tape which intersect with each other, forming interspaces therebetween. The first oblique segment has a first axial outer part in which the angle of the tape with respect to the tire circumferential direction decreases toward one end in the tire axial direction of the net structure. The second oblique segment has a second axial outer part in which the angle of the tape with respect to the tire circumferential direction decreases toward the above-said one end of the net structure. The first axial outside part is connected to the second axial outside part directly or through a circumferential segment of the tape.