Tire Rubber Assembly Segmentation for Heat Dissipation
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Solution Overview
Problem
The challenge in tire manufacturing is the deterioration of heat dissipation and uniformity due to locally increased rubber volume, leading to deformation and defects in multi-layered rubber extrudates, especially in tires with protruding portions for cross-country cars and SUVs, which affects the tire's durability and uniformity.
Innovation Solution
A tire manufacturing method involving a rubber assembly composed of three distinct rubber members with different compositions, where each member is extruded separately and united through a vulcanization process, with specific interfacial boundaries to enhance heat dissipation and adhesion, resulting in improved tire uniformity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubber volume is locally increased to provide protruding portions in shoulder and sidewall areas, then the resistance to external injury and user preference for tire appearance are improved, but heat dissipation of the extrudate is remarkably deteriorated causing deformation and defects
Solution Approach 1:
The rubber assembly is divided into multiple separate rubber members (sidewall rubber, cushion rubber, clinch rubber) with different compositions. Each member is extruded separately and then joined together through vulcanization, allowing localized rubber volume increases for protruding portions while maintaining heat dissipation through the segmented structure
Solution Approach 2:
Different rubber members are assigned different rubber compositions tailored to specific functional requirements. The sidewall rubber, cushion rubber, and clinch rubber each have optimized compositions for their respective positions, enabling localized property enhancement while managing heat dissipation in high-volume areas
2Shape
If multi-layered rubber extrudate is used with locally increased rubber volume, then protruding portions for cross country cars and SUVs are achieved, but the uniformity of the finished tire deteriorates due to deformation after assembly
Solution Approach 1:
The rubber assembly is segmented into multiple rubber members that are extruded separately with controlled shapes. This segmentation allows each member to be precisely formed before assembly, maintaining uniformity even when local protruding portions are required
Solution Approach 2:
The tire uses a composite structure of multiple rubber members with different compositions. This composite approach allows optimization of each layer's properties and shape control, achieving both protruding portions for specific applications and overall uniformity in the finished tire
3Ease of manufacture
If a single multi-layered rubber extrudate is used, then the manufacturing process is simplified, but heat dissipation deteriorates and deformation occurs after assembly
Solution Approach 1:
Instead of using a single multi-layered extrudate, the invention uses multiple separately extruded rubber members that are joined through vulcanization. This segmentation improves heat dissipation while maintaining manufacturing efficiency through standardized extrusion and assembly processes
Solution Approach 2:
The invention extracts the heat dissipation problem from the extrusion process by using separate extrusions for each rubber member. This allows each member to be extruded with optimal parameters for its specific composition, then joined together, avoiding the heat dissipation issues of single multi-layered extrusion
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method ensures excellent heat dissipation and suppresses deformation, achieving a tire with enhanced uniformity and durability by dividing the rubber assembly into extruded portions that are strongly adhered during vulcanization, resulting in a more consistent and long-lasting product.
Implementation Method 1
a first rubber member (11) including an interfacial boundary (11d) between two portions of the first rubber member (11) which have been extruded separately and then united through a vulcanization process
Data Source
AI summary
A tire having a rubber assembly including a first rubber member, a second rubber member, and a third rubber member which are arranged in series in the cross-section including the tire rotational axis. The method includes: extruding the unvulcanized rubber assembly as two separate parts which are a first extrusion rubber portion and a second extrusion rubber portion divided at a division surface passing through the unvulcanized first rubber member; winding the first extrusion rubber portion into a base annular body; and forming the unvulcanized rubber assembly by winding the second extrusion rubber portion so that only the first rubber member included in the second extrusion rubber portion overlaps with the first rubber member included in the base annular body.