Solid Rubber Tyre Thermal Management via Conductive Lower Plate
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Solution Overview
Problem
Solid rubber tires with high silica content tread parts are prone to heat generation, leading to reduced durability and mileage due to inadequate heat dissipation through the intermediate layer, which is optimized for springing and damping properties but not thermal conductivity.
Innovation Solution
Incorporating a lower plate with enhanced thermal conductivity between the intermediate layer and the tread part, made of rubber material with a higher thermal conductivity than the intermediate layer, to facilitate better heat dissipation and reduce the risk of hotspot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread part is made with high silica content (at least 40 phr) to achieve abrasion resistance and cut insensitivity, then the tire becomes more durable and cut-resistant, but excessive heat is generated leading to reduced durability and mileage
Solution Approach 1:
A lower plate is introduced as an intermediary component between the tread part and intermediate layer. This lower plate has higher thermal conductivity than both adjacent layers, acting as a heat bridge to conduct excess heat away from the silica-rich tread part, thereby preventing overheating while maintaining the abrasion-resistant silica composition
Solution Approach 2:
The tire structure is differentiated into regions with different thermal properties. The lower plate is specifically positioned in the heat-prone area between the tread and intermediate layer, creating a localized thermal management zone that addresses heat generation at its source without compromising the overall tire structure or the silica content of the tread
2Ease of operation
If the intermediate layer is optimized for springing and damping properties using carbon black filled rubber mixture, then the tire achieves good vibration absorption and comfort, but thermal conductivity is insufficient leading to inadequate heat dissipation from the tread part
Solution Approach 1:
The lower plate serves as a thermal intermediary between the intermediate layer and tread part. It has higher thermal conductivity than the carbon black filled intermediate layer, creating an efficient heat transfer pathway that complements the vibration-damping function of the intermediate layer without interfering with its springing properties
Solution Approach 2:
The tire employs a composite structure where the lower plate material combines properties of both the silica-filled tread (abrasion resistance) and carbon black-filled intermediate layer (damping), while adding superior thermal conductivity. This composite approach allows each layer to maintain its primary function while the lower plate provides enhanced thermal management
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 solution effectively dissipates heat generated in the tread part, improving the structural durability and mileage of the tire to levels comparable to conventional tires with carbon black-filled tread compounds, while maintaining the damping properties of the intermediate layer.
Implementation Method 1
a lower plate is arranged between the intermediate layer and the tread part, which has side flanks that are completely covered by the side walls and which consists of a rubber material whose thermal conductivity is greater than the thermal conductivity of the intermediate layer and at least is 0.25 W/mK
Data Source
Figure 1
AI summary
The invention relates to a solid rubber tire, comprising: a tire main body, which comes in contact with a rim and which has a bottom part (1), a cover layer (2), and an intermediate layer (3); a tread part (5), which comes in contact with a roadway and is composed of a rubber mixture predominantly or exclusively containing silicic acid as a filler; and two sidewalls (5a), which laterally cover at least the intermediate layer (3); wherein the maximum permissible abrasive wear of the tread part (5) is indicated by markings on the tread part sides. A lower plate (4) is arranged between the intermediate layer (3) and the tread part (5), which lower plate has lateral flanks (4a), which are completely covered by the sidewalls (5a) and consist of a rubber material, the thermal conductivity of which is greater than the thermal conductivity of the intermediate layer (3) and is at least 0.25 W/mK.