Pneumatic Tire Volume Adjusting Members for Resonance Control
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Solution Overview
Problem
Existing methods for changing the sectional shape of the closed space between a tire and a wheel to reduce air column resonance often lead to reduced durability and productivity due to cracking issues and weight unbalance caused by members attached to the tire inner surface in the bead portion.
Innovation Solution
Intermittently arranging volume adjusting members between the carcass layer and the inner liner layer in the bead portions of the tire, with these members crimped onto the inner liner material before tire formation, to change the sectional shape and minimize exposure to the tire surface, thereby reducing resonance and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a member is stuck to the tire inner surface in the bead portion to change the sectional shape of the closed space, then air column resonance is reduced, but cracks easily occur from ends of the member and durability is reduced
Solution Approach 1:
The volume adjusting member is embedded within the tire structure, specifically positioned between the carcass layer and the inner liner layer in the bead portion. This nesting approach integrates the resonance-control member into the tire's existing layers rather than attaching it to the inner surface, preventing exposure of ends that would otherwise crack and reduce durability.
Solution Approach 2:
Instead of attaching the volume adjusting member to the two-dimensional inner surface of the tire, the invention moves it to a different spatial dimension by embedding it between the carcass layer and inner liner layer in the bead portion. This dimensional relocation allows the member to function for resonance control while being protected from surface-related cracking issues.
2Object-affected harmful factors
If a member is stuck to the tire inner surface in the bead portion to change the sectional shape of the closed space, then air column resonance is reduced, but tire productivity is reduced
Solution Approach 1:
The volume adjusting members are crimped onto the inner liner material beforehand during the manufacturing process, before the tire is fully assembled and vulcanized. This preliminary action integrates the resonance-control members into the tire structure during normal production flow rather than requiring separate post-manufacturing attachment steps, thereby maintaining high productivity.
3Object-affected harmful factors
If volume adjusting members are arranged in the bead portion to change sectional shape, then air column resonance is reduced, but weight unbalance occurs
Solution Approach 1:
The volume adjusting members are arranged asymmetrically in the bead portion rather than being uniformly distributed. This asymmetric placement in the bead area, where mass distribution is less critical for rotational balance, allows effective resonance control while minimizing the impact on weight unbalance and rotational uniformity.
Data Source
AI summary
A method for manufacturing a pneumatic tire, including the steps of intermittently crimping volume adjusting members on both side sections of a sheet inner liner material in a longitudinal direction thereof beforehand, winding the inner liner material on an outer peripheral side of a forming drum, winding a sheet carcass material on an outer peripheral side of the inner liner material, forming an unvulcanized tire containing the inner liner material and the carcass material, and vulcanizing the unvulcanized tire. The volume adjusting members are intermittently arranged in a tire circumferential direction between the inner liner material and the carcass material.