Tire Engagement Section for Axial Positioning
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Solution Overview
Problem
Existing tire manufacturing methods face challenges in accurately supporting tire frame halves during joining, leading to potential displacement and suboptimal joint strength when using thermoplastic resin materials.
Innovation Solution
The tire design incorporates an engagement section on the tire radial direction inner side face of the crown half sections, which engages with a support jig to restrict movement in the tire width direction and is segmented irregularly in the circumferential direction, ensuring accurate positioning and preventing axial movement during the joining process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a support jig is used to support tire frame halves from the radial direction inside during joining, then the strength of the join portion is secured, but the tire frame halves may displace in the axial direction relative to the support jig
Solution Approach 1:
The engagement section is formed as a recess in the tire frame half that receives a protrusion from the support jig, creating a nested fit. This nested structure allows the support jig to penetrate into the tire frame half geometry, providing both radial support and axial positioning simultaneously, thereby resolving the contradiction between join strength and positioning accuracy.
Solution Approach 2:
The engagement section acts as an intermediary feature between the tire frame half and the support jig. This intermediate structure mediates the interaction between the two components, enabling the support jig to effectively control axial displacement while maintaining the intended function of supporting the tire frame half during the joining process.
2Manufacturing precision
If the engagement section is formed as a continuous ring, then axial movement is restricted, but manufacturing complexity increases
Solution Approach 1:
The engagement section is divided into multiple discrete engagement portions arranged circumferentially around the tire frame half. This segmentation allows each portion to independently engage with the support jig, collectively providing axial positioning without requiring a complex continuous structure. The segmented design simplifies manufacturing while maintaining positioning accuracy.
Solution Approach 2:
Instead of providing uniform engagement structure throughout the entire circumference, the engagement section is strategically positioned at specific locations where engagement with the support jig is most effective for preventing axial displacement. This localized approach reduces manufacturing complexity while achieving the necessary positioning precision.
Data Source
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AI summary
A tire frame member 17 is formed by aligning a pair of tire frame halves 17A, each including a bead portion 12, a side section 14, and a half-width crown half section 16A, with each other at the end faces of the crown half sections 16A. The tire radial direction inner side face of the crown half sections 16A includes an engagement section that engages with the outer face of a tire support member supporting the pair of tire frame halves 17A from the tire radial direction inner side, and restricts movement of the tire frame halves 17A.