Pneumatic Tire Inner Rubber Layout for Noise and Weight Balance
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Solution Overview
Problem
There is an increasing demand for passenger car tires that balance appearance performance with noise performance, particularly in the context of electric vehicles where noise reduction is critical.
Innovation Solution
A pneumatic tire design featuring a tread portion with a ground contacting surface and sidewall portions with specific thickness profiles for the inner rubber, where the first portion extending through the tread has a larger thickness than the second portion extending through the sidewall portions, optimizing the tire's profile and noise reduction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inner rubber thickness is increased in the tread portion to reduce noise and vibration, then noise performance is improved, but the tire weight and rolling resistance increase
Solution Approach 1:
The inner rubber is designed with different thicknesses in different regions: the first thickness in the tread portion is greater than the second thickness in the sidewall portions. This local differentiation allows noise reduction where needed (tread) while minimizing weight increase (sidewalls), directly resolving the contradiction between noise performance and tire weight
2Object-affected harmful factors
If the inner rubber thickness is increased throughout the tire to improve noise performance, then vibration reduction is improved, but the rolling resistance increases
Solution Approach 1:
The inner rubber thickness is locally optimized by being greater only in the tread portion (first thickness) rather than uniformly throughout. This localized approach reduces vibration at the ground contact area while minimizing the overall weight increase that would elevate rolling resistance
3Shape
If the tire profile is modified to improve appearance performance, then the sense of unity between vehicle and tire is improved, but the structural integrity and performance may be compromised
Solution Approach 1:
The inner rubber thickness is locally differentiated between the tread portion and sidewall portions, allowing the tread area to maintain structural integrity for reliability while the overall tire profile achieves improved appearance performance through the controlled thickness distribution
Solution Approach 2:
The specific thickness ratio (first thickness greater than second thickness) is optimized to balance appearance performance and structural integrity, ensuring the tire maintains its shape and strength while achieving the desired aesthetic profile
Data Source
AI summary
A pneumatic tire comprises: a tread portion having a ground contacting surface; a sidewall portions having an outer surface; a bead portions; a carcass extending between the bead portions; and an inner rubber extending between bead portions. The inner rubber comprises a first portion extending through the tread portion with a first thickness t1, and a second portion extending through the sidewall portion with a second thickness t2. The first thickness t1 is more than the second thickness t2. In a meridian cross section of the tire under its normal state, when a first reference point (Pb1), a second reference point (Pb2), a shoulder reference point (Ps), a reference line segment (Lb), and a shoulder line segment (Ls) are defined, then a length (L1) of the shoulder line segment (Ls) is 85.9% to 89.3% of a length (L2) of the reference line segment (Lb).