Tire Stitching Wheel Spiral Path for Patch Adhesion
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Solution Overview
Problem
Existing methods for repairing tires lack an efficient mechanism to ensure proper adhesion of repair patches to the inside surface of tires, often resulting in trapped air and incomplete sealing.
Innovation Solution
A tire stitching machine that rotates the tire and applies a predetermined force using a stitching wheel to translate laterally across the interior surface, creating a spiral helical path for effective stitching and adhesion of repair patches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a patch is applied to cover and seal the tire portion, then the sealing capability is improved, but air may become trapped between the patch and tire surface
Solution Approach 1:
The stitching wheel applies periodic stitching actions along the patch perimeter, creating sequential stitches that progressively expel trapped air while maintaining seal integrity. The periodic motion allows air to be gradually removed as the stitching progresses around the patch.
Solution Approach 2:
The patent replaces traditional adhesive-based sealing with a mechanical stitching system. The stitching wheel creates physical stitches through the patch and tire surface, providing mechanical interlocking that seals the patch more effectively than adhesive alone and simultaneously expels trapped air through the stitching action.
2Strength
If stitching is applied to promote adhesion, then the bond strength is improved, but the process becomes more complex
Solution Approach 1:
The stitching wheel serves multiple functions simultaneously: it creates adhesive bonds between the patch and tire surface, expels trapped air through the stitching action, and provides structural reinforcement. This multi-functionality reduces the need for separate operations and simplifies the overall repair process despite the mechanical complexity.
Solution Approach 2:
The patent optimizes stitching parameters including stitch spacing, stitch depth, and stitching speed to achieve optimal adhesion strength. By carefully controlling these parameters, the system achieves strong bonding while managing the complexity of the stitching process through standardized operational parameters.
3Manufacturing precision
If the stitching wheel applies force to the tire interior surface, then the stitching effectiveness is improved, but the tire position must be precisely controlled
Solution Approach 1:
The stitching wheel and tire are designed with complementary curved surfaces that naturally guide the stitching wheel along the tire interior. The spherical or cylindrical geometry provides automatic positioning through contact geometry, reducing the complexity of active position control systems while maintaining precise stitching effectiveness.
Data Source
AI summary
Methods, computer program products, and apparatus for stitching the interior surface of a tire, the steps of the method including rotating the tire about a central rotational axis, applying a force to maintain the tire in a substantially radial fixed position relative to a stitching wheel; applying a predetermined force to the interior surface of the tire with the stitching wheel, the stitching wheel contacting the interior surface of the tire while the tire is rotating; and, mechanically translating the stitching wheel laterally across the interior of the tire during tire rotation.