Pneumatic Tire Inner Liner Heat Dissipation Rubber Layer
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Solution Overview
Problem
Pneumatic vehicle tires face durability issues due to wrinkles and heat concentration on the inner liner, leading to airtightness and cracking problems, especially in low-profile tires under high stress conditions.
Innovation Solution
A pneumatic vehicle tire design featuring a rubber layer with specific thickness and material properties to dissipate heat, combined with a C-ply carcass construction and bead reinforcement, effectively reducing stress concentrations and preventing creases and cracking, while maintaining airtightness and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tire construction is used, then the tire structure is simple, but heat concentration occurs on the inner liner leading to wrinkles and reduced durability
Solution Approach 1:
The tire is divided into distinct functional layers: an inner liner layer for airtightness and an additional rubber layer for heat dissipation. This segmentation allows each layer to specialize in its primary function, preventing the inner liner from directly experiencing heat concentration while maintaining overall tire simplicity.
Solution Approach 2:
The additional rubber layer acts as an intermediary between the heat-generating sidewall area and the inner liner. It absorbs and dissipates heat before it reaches the inner liner, preventing heat concentration-induced wrinkles while preserving the conventional tire structure's simplicity.
2Reliability
If the inner liner is exposed to high stress areas, then the tire structure is simple, but creases form leading to loss of airtightness
Solution Approach 1:
The tire inner surface is segmented into two functional zones: the inner liner layer positioned in high-stress areas for airtightness, and an additional rubber layer covering the same areas to provide mechanical protection. This prevents crease formation without complicating the overall construction.
Solution Approach 2:
The additional rubber layer is placed beforehand in high-stress areas to cushion and distribute mechanical stresses before they can concentrate on the inner liner. This preventive measure avoids crease formation and maintains airtightness throughout the tire's life cycle.
3Productivity
If continuous stress causes cyclic deflection, then the tire operates normally, but heat build-up occurs on the inner liner
Solution Approach 1:
The additional rubber layer serves as a thermal intermediary that absorbs heat generated by cyclic deflection during normal tire operation. It conducts heat away from the inner liner more effectively, preventing temperature buildup while allowing the tire to operate normally under continuous stress.
Solution Approach 2:
The thermal parameters of the tire structure are changed by adding a rubber layer with superior heat dissipation properties. This alters the heat flow path and temperature distribution, enabling normal operation without excessive heat concentration on the inner liner.
4Temperature
If the rubber layer is too thin, then manufacturing is easier, but heat dissipation is insufficient
Solution Approach 1:
The rubber layer thickness is optimized to a specific range (0.5-2.0 mm) that balances heat dissipation capability with manufacturing feasibility. This parameter selection ensures sufficient thermal mass for effective heat absorption while remaining practical for conventional tire manufacturing processes.
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 tire design enhances durability and airtightness by dissipating heat and reducing stress concentrations, preventing wrinkles and cracks, resulting in improved performance throughout the tire's life cycle.
Implementation Method 1
The rubber layer effectively changes excessive heat concentration in the area of the covered tire inner liner. The heat concentration on the inside of the tire, which is caused by the continuous stress on the vehicle tire, can be dissipated quickly and effectively by the rubber layer.
Implementation Method 2
the rubber layer consists of a rubber material with a higher rebound or resilience value than the rubber material of the tire inner liner, which prevents heat concentration in the tire inner liner
Data Source
Figure 1
AI summary
High-durability pneumatic tires for vehicles, for which an additional rubber layer (8) is arranged on the inside of the tire above the inner liner (9), wherein the radially inner end (10) of the rubber layer (8) is arranged radially outside the underside of the tire core (3) in the area of the tire bead (1), wherein the rubber layer (8) covers the inner liner (9) up to the area of the tire shoulder (20), wherein the radially outer end (11) of the rubber layer (8) ends in the axial direction (21) of the vehicle tire below the first belt layer (12), wherein the rubber layer (8) prevents heat concentration and wrinkling on the top side of the covered inner liner (9).