Pneumatic Tire Sidewall Dimples for Heat Dissipation and Mold Precision
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Solution Overview
Problem
The processing of molds for pneumatic tires with irrational center angles is challenging due to increased errors and complexity in controlling the pitch between elements, making it difficult to achieve efficient heat dissipation and durability.
Innovation Solution
A pneumatic tire design featuring a large number of recessed or projecting elements on the side surfaces arranged at equal pitches, with a rational center angle, promoting a large surface area and turbulent flow for enhanced heat release, while simplifying the mold processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If elements are arranged at irrational center angles to maximize heat dissipation surface area, then heat release efficiency is improved, but mold processing complexity and error accumulation increase
Solution Approach 1:
The patent changes the parameter of center angle from irrational numbers to specific rational numbers (60, 72, 75, 80, 90, 100, 120, 144, 150, 160, 180, or 200 elements per rotation). This parameter change maintains heat dissipation effectiveness while enabling precise mold processing without error accumulation, as rational numbers can be exactly represented in machining operations.
Solution Approach 2:
The patent applies different center angle values to different regions or configurations of the tire sidewall elements. By selecting appropriate rational center angles based on specific design requirements, the patent optimizes both heat dissipation performance and manufacturing feasibility for different application scenarios.
2Temperature
If elements are arranged at irrational center angles, then heat dissipation surface area is maximized, but manufacturing precision and error control deteriorate
Solution Approach 1:
The patent transforms the center angle parameter from irrational to rational values, which can be precisely controlled during machining. This ensures that the pitch between elements can be accurately manufactured and repeated without cumulative errors, while still providing sufficient heat dissipation surface area through the optimized number of elements (60-200 per rotation).
3Temperature
If a large number of elements are arranged on sidewalls to promote heat release, then heat dissipation efficiency is improved, but mold machining difficulty increases
Solution Approach 1:
The patent selects rational center angles that correspond to common machining divisions (e.g., 60, 72, 90, 120, 180, 200 elements), which align with standard machining practices and tool capabilities. This makes it easier to manufacture molds with the required number of elements while maintaining effective heat dissipation.
Solution Approach 2:
The patent divides the tire sidewall into a specific number of discrete elements (60-200 per rotation) arranged at rational angular intervals. This segmentation approach allows each element to be independently formed in the mold using standard machining operations, simplifying the overall manufacturing process compared to irrational angle arrangements.
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 design achieves improved durability and ease of mold processing by creating a large surface area for heat dissipation and turbulent flow, allowing for longer tire life and reduced heat-related breakage in punctured states.
Implementation Method 1
In the tire, the dimples generate turbulent flow. The large surface area and the turbulent flow promote release of heat from each sidewall to the atmosphere.
Implementation Method 2
The large surface area promotes release of heat from the tire to the atmosphere.
Data Source
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AI summary
[Object] To provide a pneumatic tire 2 for which processing of a mold is easy and which is excellent in durability. [Solution] A tire 2 has a large number of dimples 62 on sidewalls 8 thereof. These dimples 62 are divided into dimples 62 of a first row I and dimples 62 of a second row II. The number of the dimples 62 per one row is 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 30, 32, 36, 40, 48, 5060, 72, 75, 80, 90, 100, 120, 144, 150, 160, 180, 200, 225, 240, 300, 360, 375, 400, 450, 480, 500, 600, or 720. Preferably, the number of the dimples 62 of the second row II is equal to the number of the dimples 62 of the first row I.