Offset Sound Absorbing Member Pneumatic Tire Heat Management
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Solution Overview
Problem
Existing pneumatic tire technologies face challenges in suppressing heat accumulation and maintaining high-speed durability when using sound absorbing members, as they often lead to heat buildup and reduced durability due to improper placement and design.
Innovation Solution
The pneumatic tire design includes a sound absorbing member fixed via an adhesive layer to the tire's inner surface, with a specific offset positioning towards the vehicle outer side, along with optimized groove depths and under-groove gauges, to alleviate heat accumulation and enhance high-speed durability while maintaining sound absorption effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sound absorbing member is directly adhered to the tire inner surface, then the sound absorbing effect is improved, but heat accumulation occurs in the tread portion and high-speed durability deteriorates
Solution Approach 1:
The sound absorbing member is positioned with its center offset toward the vehicle outer side (offset amount CR > 0), creating non-uniform distribution of sound absorption functionality across the tread width. This local differentiation allows the vehicle inner side to maintain better heat dissipation while the vehicle outer side provides enhanced sound absorption where ground contact pressure is lower.
2Temperature
If the sound absorbing member is disposed toward the vehicle inner side, then heat accumulation is reduced, but sound absorbing effect is compromised
Solution Approach 1:
The tire tread design employs asymmetric groove depths where the vehicle outer side has shallower grooves (GDout) and the vehicle inner side has deeper grooves (GDin). Combined with the offset sound absorbing member positioning, this asymmetry creates differentiated thermal and acoustic characteristics on each side of the tread to optimize both heat dissipation and noise reduction.
3Object-affected harmful factors
If groove depth on vehicle outer side is increased, then sound absorption is improved, but heat accumulation increases and high-speed durability deteriorates
Solution Approach 1:
The groove depth is differentiated by location: shallower on the vehicle outer side (GDout) and deeper on the vehicle inner side (GDin). This local quality variation allows the design to optimize heat dissipation on the high-heat vehicle inner side while providing sufficient sound absorption on the vehicle outer side where heat accumulation is less critical.
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 configuration effectively suppresses heat accumulation and improves high-speed durability while ensuring sufficient sound absorption, as demonstrated by improved performance in steering stability and noise reduction.
Implementation Method 1
a sound absorbing member being fixed via an adhesive layer to an inner surface of the tread portion
Data Source
AI summary
Provided is a pneumatic tire, a mounting direction of which is specified with respect to a vehicle, which includes: a tread portion extending in a tire circumferential direction and having an annular shape; a pair of sidewall portions disposed on both sides of the tread portion; and a pair of bead portions disposed inward of the sidewall portions in a tire radial direction; wherein a sound absorbing member is fixed via an adhesive layer to an inner surface of the tread portion along the tire circumferential direction, and a center position in a width direction of the sound absorbing member is disposed on a vehicle outer side.