Pneumatic Tire Damping Element Geometry for Noise Reduction
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Solution Overview
Problem
Existing pneumatic tires require a significant amount of damping material to effectively reduce noise, which is costly and inefficient.
Innovation Solution
The use of damping elements made from porous materials with a maximum height to maximum length ratio greater than 1:1 to 5:1, ensuring sufficient height for noise reduction and a stable connection to the tire inner surface, while minimizing the amount of porous material needed by tapering the elements towards the axis of rotation and optimizing their geometry and placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large amount of damping material is used, then noise reduction effectiveness is improved, but cost and material usage increase
Solution Approach 1:
The damping element is positioned at specific locations on the inner tire surface where noise generation is most critical, rather than uniformly distributing damping material throughout. The element has varying density or porosity in different regions to optimize noise absorption where needed while minimizing material usage in less critical areas
Solution Approach 2:
The damping element extends primarily in the radial direction (height) rather than covering large circumferential areas. By utilizing the radial dimension more effectively, the element achieves noise reduction through its height-to-length ratio greater than 1:1, reducing the need for extensive lateral coverage and thereby minimizing total material quantity
2Object-affected harmful factors
If the height of damping element is increased, then noise reduction effectiveness is improved, but the amount of porous material increases
Solution Approach 1:
The element's geometric parameters are optimized with a specific height-to-length ratio greater than 1:1, and preferably 4:3 or 5:3. This parameter optimization ensures sufficient height for noise reduction while controlling the overall volume of porous material required
Solution Approach 2:
The damping element combines porous material with a binding agent or coating layer that enhances noise absorption efficiency. This composite structure allows the element to achieve greater noise reduction per unit volume of porous material, effectively decoupling height increase from proportional material increase
3Reliability
If the contact area of damping element is increased, then connection stability to tire inner surface is improved, but the amount of porous material increases
Solution Approach 1:
The damping element features a concentrated contact area at its base that provides sufficient bonding surface for stable attachment to the tire inner surface. The porosity and material distribution are optimized locally at the contact interface to maximize adhesion strength without requiring the entire element volume to contribute to bonding
Solution Approach 2:
The damping element structure is divided into distinct functional zones: a base portion for stable contact and bonding with the tire surface, and an upper portion optimized for noise absorption. This segmentation allows the contact area to be optimized independently for connection stability while the remaining material volume is optimized for noise reduction, preventing unnecessary material usage
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
This approach achieves effective noise reduction while minimizing material usage, ensuring a stable connection and reducing costs, with the ability to adapt to different acoustic conditions and improve tire concentricity.
Implementation Method 1
the at least one damping element is made of a porous material and is suitable for noise reduction
Data Source
Figure 1
Figure 2~3
Figure 4~4.7
AI summary
The invention relates to a pneumatic tire (L) with at least one damping element (8), wherein the at least one damping element (8) is located inside the pneumatic tire (L) on an inner tire surface (7) opposite a tread (1) of the pneumatic tire (L), and wherein the at least one damping element (8) is made of a porous material and is suitable for reducing noise, wherein a maximum height (H1) of the at least one damping element (8) is greater than a maximum length (L1) of the at least one damping element (8), wherein the maximum height (H1) to the maximum length (L1) is in a first length ratio of greater than 1:1 to 5:1 and preferably 4:3 or 5:3.