Carcass Ply Tape Layout for Smoother Tire Surfaces
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Solution Overview
Problem
The existing tire production method using wide tapes with high rigidity faces challenges in achieving dimensional accuracy and surface smoothness due to overlapping issues at the tire equatorial plane and end portions, leading to appearance defects and vibrations.
Innovation Solution
A tire design featuring tape-like members with a width of 1 to 10 mm, where adjacent members are butted at the tire equatorial plane and overlap only at rubber portions at the end portions, allowing for varying angles and reducing surface irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wide tapes with high rigidity are used for forming the carcass ply, then productivity is improved and the production process is simplified, but appearance defects and vibrations occur on the tire surface due to overlapping at the end portions
Solution Approach 1:
The patent changes the key parameter of tape width from the conventional 10-50 mm to a narrower range of 1-10 mm. This parameter change reduces the rigidity of each tape while maintaining overall structural integrity through increased tape quantity, thereby eliminating overlapping at end portions and preventing surface defects while preserving production efficiency
Solution Approach 2:
Instead of using fewer wide tapes, the patent segments the carcass ply construction into multiple narrower tapes (1-10 mm width). This segmentation allows for better distribution and positioning of tapes, eliminating the overlapping problem at end portions while maintaining the productivity benefits of the sequential attachment method
2Ease of manufacture
If wide tapes with high rigidity are used for forming the carcass ply, then the production process is simplified, but it becomes difficult to attach tapes while following the angular variation caused by crown curvature
Solution Approach 1:
By changing the tape width parameter to 1-10 mm, the patent reduces individual tape rigidity while increasing flexibility. This allows the tapes to conform to angular variations caused by crown curvature during attachment, improving adaptability without significantly complicating the manufacturing process
Solution Approach 2:
Segmenting the carcass ply into multiple narrow tapes increases the flexibility of the overall structure. The segmented approach allows each tape to more easily follow angular variations, and the collective arrangement maintains the desired structural properties while adapting to crown curvature
3Productivity
If tapes are attached to overlap at the end portions of the carcass ply, then the production process is simplified, but appearance defects and vibrations occur on the tire surface
Solution Approach 1:
The patent changes the tape width parameter to prevent overlapping at end portions. By using narrower tapes (1-10 mm) arranged in a specific pattern, the design ensures that tapes butt against each other at the equatorial plane without overlapping at end portions, thereby eliminating appearance defects while maintaining production efficiency
Solution Approach 2:
Instead of allowing tapes to overlap at end portions as in conventional methods, the patent inverts the arrangement strategy by having tapes butt against each other at the equatorial plane. This inverted approach prevents overlapping at end portions, eliminating the harmful effect of appearance defects while preserving the simplicity and productivity of the sequential attachment process
Data Source
AI summary
The provide is an tire and an tire production method for the tire, wherein the carcass ply is comprised of tape-like members arranged in the tire circumferential direction, in which a plurality of carcass cords arranged parallel to each other are coated with rubber; the tape-like member has a tape width of 1 to 10 mm; on the tire equatorial plane, two of the tape-like members adjacent to each other in the tire circumferential direction are butted against each other at tire circumferential ends thereof; and at the end portions of the carcass ply, two of the tape-like members adjacent to each other in the tire circumferential direction overlap each other only at rubber portions thereof.